This document discusses approaches to breeding plants for salinity tolerance. It begins with an introduction describing how salinity affects agricultural productivity and the need to develop salt-tolerant crops. It then outlines various breeding approaches used, including mutation breeding, exploiting wild relatives, double haploids, marker-assisted breeding, genetic engineering, and CRISPR/Cas9. Specific examples are provided for some of these approaches. A variety of techniques for evaluating salinity tolerance are also mentioned, such as hyperspectral imaging and genome-wide association studies. The document concludes by noting that further studies on molecular mechanisms and stress responses can aid breeding efforts to develop crops able to perform well under saline conditions.
The study developed stochastic models to analyze the economic and environmental impacts of biodiesel production from Jatropha curcas in Nepal. The models determined that a minimum seed yield of 3.9 tons/hectare and oil content above 50% by weight are required for the biodiesel selling price to be comparable to conventional diesel prices. Including direct and indirect land use changes, the carbon footprint of Jatropha biodiesel could be lower than conventional fuels if high seed yields above 5 tons/hectare are achieved using only marginal lands and with aggressive afforestation. The results identify pathways for policies to enable sustainable Jatropha biodiesel production.
Post genomic tools for genetic enhancement of germplasmVishu1234567
This document discusses how post-genomic tools like transcriptomics, proteomics, and metabolomics can be used for genetic enhancement of germplasm. It provides an introduction to each omics technique, examples of technologies used, and applications in understanding biological processes and identifying genes/proteins involved in traits. The conclusion states that omics expression analysis of germplasm will help characterize genome function and restore traits from wild varieties, aiding development of more sustainable crop varieties.
JBEI Research Highlight Slides - February 2021SaraHarmon4
This study analyzed goat gut microbiomes to understand lignocellulose breakdown. Researchers enriched over 400 microbial consortia from goat feces under different conditions. They assembled 719 high-quality genomes, including bacteria, archaea, and fungi. Anaerobic fungi dominated the most active consortia and outperformed bacterial consortia in degrading cellulose and producing methane. Metabolic pathway analysis suggested cross-domain partnerships between fungi and methanogens enabled different metabolic outputs than bacterial consortia. The findings provide insight into natural biomass breakdown that can inform industrial bioprocessing.
CRISPR/Cas systems: The link between functional genes and genetic improvement. The discovery and modification of CRISPR/Cas system, a nature-occurred gene editing tool, opens an era for studying gene function and precision crop breeding
cutting-edge biotechnological tool for crop improvement
Used for pathogen resistance, abiotic tolerance, plant development and morphology and even secondary metabolism and fiber development
The study identified and characterized a BAHD family acyltransferase in poplar, PtrPHBMT1, that transfers p-hydoxybenzoate from its thio-ester donor to the sinapyl alcohol monolignol. This results in the conjugate being incorporated into nascent lignin polymers, leading to ester-linked p-hydoxybenzoate pendant groups and altering lignin properties. Genetically manipulating this enzyme controlling lignin p-hydroxybenzoylation could allow accumulating this high-value chemical, p-hydoxybenzoate, in lignocellulosic biomass and improve biofuel production and timber dur
1) Safflower is an annual herbaceous plant cultivated for edible oil, herbal tea, and textile dye. It faces challenges like low seed yield and lack of disease resistance.
2) Genetic improvement strategies include developing ideotypes for high seed yield through heterosis, interspecific hybridization, and increasing oil content. Marker-assisted breeding is being used to select for high oleic acid and disease resistance traits.
3) Studies have identified microRNAs related to high oleic acid content and developed disease-resistant plants using tissue culture selection. Genetic transformation protocols allow incorporation of useful genes.
The document describes a study that used the DAYCENT model with site-specific environmental data to simulate sorghum biomass yield, soil organic carbon, and nitrous oxide emissions across cultivated lands in the continental United States. The results suggest over 10 million hectares in the Southern and Lower Midwestern US could produce over 10 megagrams per hectare per year of biomass sorghum with net carbon sequestration under rainfed conditions. The methodology developed provides an opportunity to explore other bioenergy crops, and the high resolution spatially explicit results are critical inputs for life-cycle assessments and climate change mitigation strategies.
Marker-assisted selection (MAS) is a plant breeding technique that uses DNA markers linked to traits of interest to guide the selection of desirable plants, rather than selecting based solely on visual phenotypes. MAS allows breeders to introgress traits from donor plants more efficiently by selecting plants with DNA markers correlated with the traits. The method has been used successfully in crops like rice and maize to develop varieties with improved disease resistance and grain quality. While MAS can speed breeding, it also has limitations like high costs and the need for well-trained personnel. Ongoing research continues to overcome challenges and make MAS technology more accessible to plant breeders around the world.
The study developed stochastic models to analyze the economic and environmental impacts of biodiesel production from Jatropha curcas in Nepal. The models determined that a minimum seed yield of 3.9 tons/hectare and oil content above 50% by weight are required for the biodiesel selling price to be comparable to conventional diesel prices. Including direct and indirect land use changes, the carbon footprint of Jatropha biodiesel could be lower than conventional fuels if high seed yields above 5 tons/hectare are achieved using only marginal lands and with aggressive afforestation. The results identify pathways for policies to enable sustainable Jatropha biodiesel production.
Post genomic tools for genetic enhancement of germplasmVishu1234567
This document discusses how post-genomic tools like transcriptomics, proteomics, and metabolomics can be used for genetic enhancement of germplasm. It provides an introduction to each omics technique, examples of technologies used, and applications in understanding biological processes and identifying genes/proteins involved in traits. The conclusion states that omics expression analysis of germplasm will help characterize genome function and restore traits from wild varieties, aiding development of more sustainable crop varieties.
JBEI Research Highlight Slides - February 2021SaraHarmon4
This study analyzed goat gut microbiomes to understand lignocellulose breakdown. Researchers enriched over 400 microbial consortia from goat feces under different conditions. They assembled 719 high-quality genomes, including bacteria, archaea, and fungi. Anaerobic fungi dominated the most active consortia and outperformed bacterial consortia in degrading cellulose and producing methane. Metabolic pathway analysis suggested cross-domain partnerships between fungi and methanogens enabled different metabolic outputs than bacterial consortia. The findings provide insight into natural biomass breakdown that can inform industrial bioprocessing.
CRISPR/Cas systems: The link between functional genes and genetic improvement. The discovery and modification of CRISPR/Cas system, a nature-occurred gene editing tool, opens an era for studying gene function and precision crop breeding
cutting-edge biotechnological tool for crop improvement
Used for pathogen resistance, abiotic tolerance, plant development and morphology and even secondary metabolism and fiber development
The study identified and characterized a BAHD family acyltransferase in poplar, PtrPHBMT1, that transfers p-hydoxybenzoate from its thio-ester donor to the sinapyl alcohol monolignol. This results in the conjugate being incorporated into nascent lignin polymers, leading to ester-linked p-hydoxybenzoate pendant groups and altering lignin properties. Genetically manipulating this enzyme controlling lignin p-hydroxybenzoylation could allow accumulating this high-value chemical, p-hydoxybenzoate, in lignocellulosic biomass and improve biofuel production and timber dur
1) Safflower is an annual herbaceous plant cultivated for edible oil, herbal tea, and textile dye. It faces challenges like low seed yield and lack of disease resistance.
2) Genetic improvement strategies include developing ideotypes for high seed yield through heterosis, interspecific hybridization, and increasing oil content. Marker-assisted breeding is being used to select for high oleic acid and disease resistance traits.
3) Studies have identified microRNAs related to high oleic acid content and developed disease-resistant plants using tissue culture selection. Genetic transformation protocols allow incorporation of useful genes.
The document describes a study that used the DAYCENT model with site-specific environmental data to simulate sorghum biomass yield, soil organic carbon, and nitrous oxide emissions across cultivated lands in the continental United States. The results suggest over 10 million hectares in the Southern and Lower Midwestern US could produce over 10 megagrams per hectare per year of biomass sorghum with net carbon sequestration under rainfed conditions. The methodology developed provides an opportunity to explore other bioenergy crops, and the high resolution spatially explicit results are critical inputs for life-cycle assessments and climate change mitigation strategies.
Marker-assisted selection (MAS) is a plant breeding technique that uses DNA markers linked to traits of interest to guide the selection of desirable plants, rather than selecting based solely on visual phenotypes. MAS allows breeders to introgress traits from donor plants more efficiently by selecting plants with DNA markers correlated with the traits. The method has been used successfully in crops like rice and maize to develop varieties with improved disease resistance and grain quality. While MAS can speed breeding, it also has limitations like high costs and the need for well-trained personnel. Ongoing research continues to overcome challenges and make MAS technology more accessible to plant breeders around the world.
The document discusses several studies related to engineering plants for improved biomass composition for biofuel production. One study found that Arabidopsis plants engineered to have low lignin and xylan content showed increased drought tolerance compared to wild-type plants. The engineered plants exhibited lower water loss, up-regulation of drought response genes, and a stronger response to the plant hormone ABA. This demonstrates that modifying secondary cell walls to improve biomass composition does not necessarily compromise plant resilience to the environment.
JBEI Research Highlights - January 2018 Irina Silva
The document describes engineering plant biomass and E. coli for improved biofuel production. In plants, genes were combined to increase sugars and decrease lignin, improving properties for biofuel production without negative growth effects. In E. coli, strategies like deleting pgi to increase NADPH or downregulating CRP improved methyl ketone production from glucose and xylose simultaneously, demonstrating a way to utilize C6 and C5 sugars for biofuel production from cellulosic biomass.
This study evaluated the use of Raman spectroscopy and partial least squares modeling to predict lignin syringyl-to-guaiacyl (S/G) ratios in Acacia and Eucalyptus plants. Pairwise comparisons found predicted S/G ratios from Raman spectra matched those measured using pyrolysis/molecular beam mass spectrometry. The Raman spectroscopy method provides a high-throughput way to evaluate lignin composition without destructive analytical techniques, showing potential for phenotypic screening of plant cell wall traits.
This presentation gives an insight into the mammalian cell being used as an expression system, it also includes a brief introduction to the strong promoters.
This research proposal aims to develop efficient genetic transformation protocols for medicinal plants in Malaysia. The objectives are to optimize tissue culture media, particle bombardment parameters for gene transfer, and regeneration media. Several medicinal plants will be screened for tissue culture and Rice used as a control. The effects of different hormones, concentrations, and combinations on callus growth and regeneration will be investigated. The optimized conditions will be used to transfer genes encoding therapeutic proteins via particle bombardment. Transformed calli will be verified using GFP, GUS, PCR and Southern blot. Successful transgenic plants expressing the introduced genes will be produced for applications in human and animal healthcare. The expected timeline is provided in a Gantt chart.
Recent advances in technoeconomic analysis (TEA) were reviewed:
- TEA is useful for process design, cost estimation, and identifying bottlenecks early in research.
- Studies now enable faster iteration, robust uncertainty analysis, and open-source platforms.
- Trends include more expansive system boundaries and potential integration with high-throughput experiments.
The document describes the use of MAGIC (Multi-parent Advanced Generation Inter-Cross) populations for vegetable improvement and QTL mapping. MAGIC populations have increased genetic diversity compared to biparental populations due to the use of multiple founders. They allow for improved QTL mapping resolution and detection. Case studies in tomato, brinjal, and common bean are described where MAGIC populations were developed and used to map QTL for traits like anthocyanin content and drought tolerance. Founder lines are intercrossed in funnel or diallel designs over multiple generations to generate immortal RIL populations with equal proportions of founder genomes.
Precision Breeding for Climate-Smart Crops - Integrating Genome Editing and B...Sudip Kundu
Climate change poses a serious threat to global food security, demanding innovative solutions. Precision breeding, leveraging the power of genome editing and bioinformatics, presents a promising approach to develop climate-smart crops. This presentation explores the exciting convergence of these technologies, unveiling their potential to unlock resilient and adaptable crops for a changing world.
Key topics covered:
Climate change challenges: Explore the growing threats to agriculture, including rising temperatures, droughts, floods, and pests.
Precision breeding fundamentals: Demystify genome editing techniques like CRISPR and their role in targeted genetic modifications.
Bioinformatics in action: Discover how computational tools analyze vast genetic data, guiding precise interventions in crops.
Developing climate-smart crops: Learn how scientists harness this combined power to breed for traits like heat tolerance, water efficiency, and disease resistance.
Real-world applications: Witness case studies showcasing the development of climate-resilient crops like wheat, rice, and maize.
Future outlook: Discuss the ethical considerations, regulatory frameworks, and potential breakthroughs shaping the future of precision breeding.
Join us on this journey to explore how precision breeding can:
Boost food security in a changing climate
Empower farmers and ensure sustainable agriculture
Shape a brighter future for generations to come
Don't miss this insightful presentation. Share it with your network and engage in the discussion!
#ClimateSmartCrops #PrecisionBreeding #GenomeEditing #Bioinformatics #FoodSecurity
This study analyzed changes in the bacterial and fungal microbiome of soil samples treated with biosolarization, which uses solar heating and organic amendments. Sequencing analysis found that biosolarization had a stronger impact on the relative abundance of bacterial phyla than fungi. Network analysis identified microbial clusters correlated with volatile fatty acid accumulation, suggesting genera like Clostridium, Weissella and Acetobacter can tolerate and potentially produce these compounds. The results provide insight into structural changes in the soil microbiome during biosolarization as related to volatile fatty acid levels.
Genomics, proteomics and metabolomics are the three core omics technologies, which respectively deal with the analysis of genome, proteome and metabolome of cells and tissues of an organism.
This document summarizes three papers related to biological conversion of lignocellulosic biomass. The first paper evaluates two red yeast species for their ability to assimilate sugars and aromatics from engineered Arabidopsis plants and successfully converts these products into biofuel precursors. The second paper identifies small drug resistance pumps in Bacillus bacteria that confer tolerance to ionic liquids used in biomass pretreatment and characterizes riboswitches that regulate these pumps. The third paper finds that engineered Pseudomonas putida produces more methyl ketones, a promising diesel blendstock, when grown on plant hydrolysates compared to sugars, due to plant-derived amino acids.
Genome projects and their ContributionsAlbertPaul18
This is a presentation about different Genome projects like Rice genome project, Maize genome project, Wheat Genome project and Human genome project. It highlights how they were conducted and what the science community gained by conducting them. A side about the future challenges of such genome projects is also added.
Reverse breeding is a novel plant breeding technique that allows the development of parental lines directly from any superior heterozygous plant. It involves suppressing meiotic recombination to produce gametes with whole parental chromosome sets, followed by doubling of haploids to generate parental lines. Two case studies demonstrate using RNAi to silence meiotic genes in Arabidopsis thaliana, producing parental lines that reconstitute the original hybrid when crossed. A second technique, marker-assisted reverse breeding, uses high-density SNP genotyping instead of gene silencing to select maize lines similar to original parents within one year. Reverse breeding techniques accelerate breeding and facilitate hybrid improvement without prior knowledge of parental lines.
Base editing is being used to induce precise mutations in rice in order to accelerate crop improvement. Researchers developed a base editing-mediated gene evolution method to diversify the sequence of the rice acetolactate synthase 1 (OsALS1) gene, which codes for the target of herbicide resistance. Multiple sgRNAs were used to introduce mutations across the OsALS1 locus. Novel mutations were identified that conferred resistance to the herbicide bispyribac-sodium. The resistant mutation was then introduced into an elite rice cultivar through base editing to generate a new herbicide tolerant variety. This demonstrates how base editing can be used to artificially evolve genes and introduce beneficial traits into commercial crops.
Dr. Renato Vicentini from the State University of Campinas presented his research using systems biology approaches to understand sucrose synthesis and accumulation in sugarcane. His laboratory investigates gene regulatory, metabolic, and protein networks in sugarcane. They are developing predictive models to scale from genotype to phenotype. Their goals are to understand how some sugarcane genotypes accumulate more sucrose than others and to investigate allosteric regulation of key enzymes. Their approaches include RNA sequencing, metabolic profiling, and phosphoproteomics. They are also manipulating source-sink relationships in sugarcane to study differential gene expression and developing a sugarcane transcriptome. The talk provided an overview of their work using multi-omics data to build biological networks
Metagenomics is the study of genetic material recovered directly from environmental samples without culturing organisms. It allows researchers to study the 99.9% of microorganisms that cannot be cultured. Metagenomic analyses of ocean samples revealed over a million new genes and unexpected light-energy pathways in bacteria. Metagenomics has two main approaches - sequence-driven which sequences DNA and compares to databases, and function-driven which screens DNA clones for a desired function. Both approaches have limitations but are complementary. Metagenomics has applications in discovering new antibiotics and enzymes and studying human microbiomes and antibiotic resistance.
Recombinant proteins can be produced at large scale by expressing the gene of interest in a suitable expression system like bacteria, yeast, insect or mammalian cells. The recombinant protein is then isolated and purified using various chromatography techniques based on properties like size, charge, hydrophobicity. Common purification steps include capture using affinity or ion-exchange chromatography followed by polishing steps using techniques like size-exclusion chromatography to obtain highly purified protein. Rational design of purification schemes involves selecting orthogonal chromatography methods to separate the target protein from contaminants at each step based on resolution, capacity, and recovery needs.
Gene stacking and its materiality in crop improvementShamlyGupta
Gene stacking involves combining two or more transgenes into a host plant genome. It can be achieved through iterative crossing of transgenic plants, re-transformation of transgenic plants with additional genes, or co-transformation of multiple genes simultaneously. Co-transformation allows multiple genes to be introduced together but risks silencing effects if the same promoter is used. Iterative crossing is time-consuming but avoids this issue. Gene stacking holds promise for improving crop traits like disease resistance and nutrition but careful selection is needed to maintain expression levels of all genes. Recent examples demonstrate progress in stacking drought tolerance, yield, and nutrition genes into elite crop varieties.
JBEI Research Highlights - January 2017Irina Silva
The document describes a study that engineered E. coli strains to overexpress the ptsI gene involved in glucose uptake. The strains were cultivated under nitrogen starvation conditions to limit growth during production. Overexpression of ptsI maintained higher glucose uptake and metabolic rates under starvation, leading to a fourfold increase in fatty alcohol production compared to exponential growth. The results demonstrate the potential of limiting growth through nitrogen starvation coupled with ptsI overexpression to improve biofuel and bioproduct yields in E. coli.
How to Build a Module in Odoo 17 Using the Scaffold MethodCeline George
Odoo provides an option for creating a module by using a single line command. By using this command the user can make a whole structure of a module. It is very easy for a beginner to make a module. There is no need to make each file manually. This slide will show how to create a module using the scaffold method.
it describes the bony anatomy including the femoral head , acetabulum, labrum . also discusses the capsule , ligaments . muscle that act on the hip joint and the range of motion are outlined. factors affecting hip joint stability and weight transmission through the joint are summarized.
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The document discusses several studies related to engineering plants for improved biomass composition for biofuel production. One study found that Arabidopsis plants engineered to have low lignin and xylan content showed increased drought tolerance compared to wild-type plants. The engineered plants exhibited lower water loss, up-regulation of drought response genes, and a stronger response to the plant hormone ABA. This demonstrates that modifying secondary cell walls to improve biomass composition does not necessarily compromise plant resilience to the environment.
JBEI Research Highlights - January 2018 Irina Silva
The document describes engineering plant biomass and E. coli for improved biofuel production. In plants, genes were combined to increase sugars and decrease lignin, improving properties for biofuel production without negative growth effects. In E. coli, strategies like deleting pgi to increase NADPH or downregulating CRP improved methyl ketone production from glucose and xylose simultaneously, demonstrating a way to utilize C6 and C5 sugars for biofuel production from cellulosic biomass.
This study evaluated the use of Raman spectroscopy and partial least squares modeling to predict lignin syringyl-to-guaiacyl (S/G) ratios in Acacia and Eucalyptus plants. Pairwise comparisons found predicted S/G ratios from Raman spectra matched those measured using pyrolysis/molecular beam mass spectrometry. The Raman spectroscopy method provides a high-throughput way to evaluate lignin composition without destructive analytical techniques, showing potential for phenotypic screening of plant cell wall traits.
This presentation gives an insight into the mammalian cell being used as an expression system, it also includes a brief introduction to the strong promoters.
This research proposal aims to develop efficient genetic transformation protocols for medicinal plants in Malaysia. The objectives are to optimize tissue culture media, particle bombardment parameters for gene transfer, and regeneration media. Several medicinal plants will be screened for tissue culture and Rice used as a control. The effects of different hormones, concentrations, and combinations on callus growth and regeneration will be investigated. The optimized conditions will be used to transfer genes encoding therapeutic proteins via particle bombardment. Transformed calli will be verified using GFP, GUS, PCR and Southern blot. Successful transgenic plants expressing the introduced genes will be produced for applications in human and animal healthcare. The expected timeline is provided in a Gantt chart.
Recent advances in technoeconomic analysis (TEA) were reviewed:
- TEA is useful for process design, cost estimation, and identifying bottlenecks early in research.
- Studies now enable faster iteration, robust uncertainty analysis, and open-source platforms.
- Trends include more expansive system boundaries and potential integration with high-throughput experiments.
The document describes the use of MAGIC (Multi-parent Advanced Generation Inter-Cross) populations for vegetable improvement and QTL mapping. MAGIC populations have increased genetic diversity compared to biparental populations due to the use of multiple founders. They allow for improved QTL mapping resolution and detection. Case studies in tomato, brinjal, and common bean are described where MAGIC populations were developed and used to map QTL for traits like anthocyanin content and drought tolerance. Founder lines are intercrossed in funnel or diallel designs over multiple generations to generate immortal RIL populations with equal proportions of founder genomes.
Precision Breeding for Climate-Smart Crops - Integrating Genome Editing and B...Sudip Kundu
Climate change poses a serious threat to global food security, demanding innovative solutions. Precision breeding, leveraging the power of genome editing and bioinformatics, presents a promising approach to develop climate-smart crops. This presentation explores the exciting convergence of these technologies, unveiling their potential to unlock resilient and adaptable crops for a changing world.
Key topics covered:
Climate change challenges: Explore the growing threats to agriculture, including rising temperatures, droughts, floods, and pests.
Precision breeding fundamentals: Demystify genome editing techniques like CRISPR and their role in targeted genetic modifications.
Bioinformatics in action: Discover how computational tools analyze vast genetic data, guiding precise interventions in crops.
Developing climate-smart crops: Learn how scientists harness this combined power to breed for traits like heat tolerance, water efficiency, and disease resistance.
Real-world applications: Witness case studies showcasing the development of climate-resilient crops like wheat, rice, and maize.
Future outlook: Discuss the ethical considerations, regulatory frameworks, and potential breakthroughs shaping the future of precision breeding.
Join us on this journey to explore how precision breeding can:
Boost food security in a changing climate
Empower farmers and ensure sustainable agriculture
Shape a brighter future for generations to come
Don't miss this insightful presentation. Share it with your network and engage in the discussion!
#ClimateSmartCrops #PrecisionBreeding #GenomeEditing #Bioinformatics #FoodSecurity
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Genomics, proteomics and metabolomics are the three core omics technologies, which respectively deal with the analysis of genome, proteome and metabolome of cells and tissues of an organism.
This document summarizes three papers related to biological conversion of lignocellulosic biomass. The first paper evaluates two red yeast species for their ability to assimilate sugars and aromatics from engineered Arabidopsis plants and successfully converts these products into biofuel precursors. The second paper identifies small drug resistance pumps in Bacillus bacteria that confer tolerance to ionic liquids used in biomass pretreatment and characterizes riboswitches that regulate these pumps. The third paper finds that engineered Pseudomonas putida produces more methyl ketones, a promising diesel blendstock, when grown on plant hydrolysates compared to sugars, due to plant-derived amino acids.
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This is a presentation about different Genome projects like Rice genome project, Maize genome project, Wheat Genome project and Human genome project. It highlights how they were conducted and what the science community gained by conducting them. A side about the future challenges of such genome projects is also added.
Reverse breeding is a novel plant breeding technique that allows the development of parental lines directly from any superior heterozygous plant. It involves suppressing meiotic recombination to produce gametes with whole parental chromosome sets, followed by doubling of haploids to generate parental lines. Two case studies demonstrate using RNAi to silence meiotic genes in Arabidopsis thaliana, producing parental lines that reconstitute the original hybrid when crossed. A second technique, marker-assisted reverse breeding, uses high-density SNP genotyping instead of gene silencing to select maize lines similar to original parents within one year. Reverse breeding techniques accelerate breeding and facilitate hybrid improvement without prior knowledge of parental lines.
Base editing is being used to induce precise mutations in rice in order to accelerate crop improvement. Researchers developed a base editing-mediated gene evolution method to diversify the sequence of the rice acetolactate synthase 1 (OsALS1) gene, which codes for the target of herbicide resistance. Multiple sgRNAs were used to introduce mutations across the OsALS1 locus. Novel mutations were identified that conferred resistance to the herbicide bispyribac-sodium. The resistant mutation was then introduced into an elite rice cultivar through base editing to generate a new herbicide tolerant variety. This demonstrates how base editing can be used to artificially evolve genes and introduce beneficial traits into commercial crops.
Dr. Renato Vicentini from the State University of Campinas presented his research using systems biology approaches to understand sucrose synthesis and accumulation in sugarcane. His laboratory investigates gene regulatory, metabolic, and protein networks in sugarcane. They are developing predictive models to scale from genotype to phenotype. Their goals are to understand how some sugarcane genotypes accumulate more sucrose than others and to investigate allosteric regulation of key enzymes. Their approaches include RNA sequencing, metabolic profiling, and phosphoproteomics. They are also manipulating source-sink relationships in sugarcane to study differential gene expression and developing a sugarcane transcriptome. The talk provided an overview of their work using multi-omics data to build biological networks
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Gene stacking and its materiality in crop improvementShamlyGupta
Gene stacking involves combining two or more transgenes into a host plant genome. It can be achieved through iterative crossing of transgenic plants, re-transformation of transgenic plants with additional genes, or co-transformation of multiple genes simultaneously. Co-transformation allows multiple genes to be introduced together but risks silencing effects if the same promoter is used. Iterative crossing is time-consuming but avoids this issue. Gene stacking holds promise for improving crop traits like disease resistance and nutrition but careful selection is needed to maintain expression levels of all genes. Recent examples demonstrate progress in stacking drought tolerance, yield, and nutrition genes into elite crop varieties.
JBEI Research Highlights - January 2017Irina Silva
The document describes a study that engineered E. coli strains to overexpress the ptsI gene involved in glucose uptake. The strains were cultivated under nitrogen starvation conditions to limit growth during production. Overexpression of ptsI maintained higher glucose uptake and metabolic rates under starvation, leading to a fourfold increase in fatty alcohol production compared to exponential growth. The results demonstrate the potential of limiting growth through nitrogen starvation coupled with ptsI overexpression to improve biofuel and bioproduct yields in E. coli.
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His expertise extends across a diverse spectrum of reporting, database, and web development applications, underpinned by an exceptional grasp of data storage and virtualization technologies. His proficiency in application testing, database administration, and data cleansing ensures seamless execution of complex projects.
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Date: May 29, 2024
Tags: Information Security, ISO/IEC 27001, ISO/IEC 42001, Artificial Intelligence, GDPR
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Walmart Business+ and Spark Good for Nonprofits.pdfTechSoup
"Learn about all the ways Walmart supports nonprofit organizations.
You will hear from Liz Willett, the Head of Nonprofits, and hear about what Walmart is doing to help nonprofits, including Walmart Business and Spark Good. Walmart Business+ is a new offer for nonprofits that offers discounts and also streamlines nonprofits order and expense tracking, saving time and money.
The webinar may also give some examples on how nonprofits can best leverage Walmart Business+.
The event will cover the following::
Walmart Business + (https://business.walmart.com/plus) is a new shopping experience for nonprofits, schools, and local business customers that connects an exclusive online shopping experience to stores. Benefits include free delivery and shipping, a 'Spend Analytics” feature, special discounts, deals and tax-exempt shopping.
Special TechSoup offer for a free 180 days membership, and up to $150 in discounts on eligible orders.
Spark Good (walmart.com/sparkgood) is a charitable platform that enables nonprofits to receive donations directly from customers and associates.
Answers about how you can do more with Walmart!"
3. Introduction
• The green revolution brought about by the application of chemical fertilisers led
to explosion of food grains but left behind the problem of salinity.
• Salinity has negative impact on agricultural productivity affecting plant growth
and restricting the use of land.
• Population is expected to double in the near future. As green revolution has
already reached its ceiling, there is major concern over food supply.
• Rapidly shrinking agricultural land due to industrialisation and habitat use is a
major threat to sustainable food production.
• Thus it is imperative to raise salt tolerant plants to effectively use salt affected
agricultural land for sustainable crop production.
4. What is salinity stress?
• It is a physiological outcome of excessive salt in plant cell which has
detrimental effects on plant’s metabolism.
• Soils are classified as saline when ECe (Electrical Conductivity of a
saturated soil extract) is ≥4 dS/m which is equivalent to 40mM NaCl
and give rise to osmotic pressure 0.2 MPa.
5. Responses under salinity stress
Morphological
• Early flowering
• Prevention of lateral
shoot development
and root adaptations
Physiological
• Stomatal responses
• Osmotic adjustment
• Na+/K+ discrimination
• Ion homeostasis
Biochemical
• Antioxidant activity
• Polyamines
• Change in hormone
level
• Increased proline
level
6. • Soil salinity inhibits plant growth and reproduction through initial
osmotic stress phase followed by ion toxicity due to accumulation of
Na+ and Cl- ions in the cell cytosol in oxidative stress and nutritional
deprivation
• ROS scavenging, ion homeostasis, osmotic adjustments and metabolic
activities are greatly affected.
• In order to overcome, plants accumulate compatible harmless bio
molecules like polyamines, HSPs, NO, ABA, salicylic acid and
brassinosteroids.
7.
8. Breeding approaches
With the advancement in genetic inheritance, evaluation techniques, software
techniques, molecular markers, modification of germplasm and mapping, it
facilitates the improvement in salt tolerance.
9. Mutation breeding
• A tool for creating genetic variation, is useful for crop improvement.
• Key point is the identification of individuals with a target mutation
involving two major steps: screening and confirmation of mutants.
• The seeds are treated with mutagens and grown further for
segregation and the plants with useful traits are selected to grow next
generation.
• Multi-location trials are conducted for evaluation and released as a
new variety with use.
10. Case study
• Lethin et al (2020) developed a mutant population of wheat with the
aim to improve salinity tolerance. They used Bangladeshi variety BARI
Gom-25 which was semi-tolerant to salinity and treating it with EMS
and then compared it with local wheat varieties. After screening, they
identified that out of 1676 lines, 70 lines manifested enhanced
salinity tolerance. Results indicated that mutant lines showed good
salinity tolerance than the local varieties.
11. Wild relative exploitation
• Interspecific hybridization has a crucial role in improving the crop plant
performance for tolerance to several abiotic stresses
• Wild relatives of crops are utilized as a source in biotic as well abiotic stress
tolerance to increase the crop productivity; however, it requires specialized
methods to do so, such as embryo rescue.
• Colmer et al (2006) have assessed the scenarios for salt tolerance improvement
in wheat crop by using wild relatives of wheat.
12. Double haploid
• Advantages of shortening of the breeding cycle, high selection efficiency,
homozygosity fixation, and expression of recessive alleles suitable for breeding.
• Produces the homozygous lines of haploid plants by chromosome doubling from
pollen or egg cells.
• Diploidisation of haploid genomes can be produced either by artificial genome
doubling (colchicine treatment) or spontaneous genome doubling (endomitosis:
chromosome doubling without nucleus division).
• Efficient for fixation of favorable alleles controlling important traits.
• Powerful tool in mapping of QTLs controlling quantitative traits.
• Al-Ashkar et al (2019) detected salt tolerance of 15 lines of wheat which was
developed using DH technique.
13. Marker-assisted breeding (MAB)
• Indirect selection process in which the trait of interest is selected on marker basis
rather than phenotypic selection.
• For efficient marker selection, marker to be used should be close enough to the
gene of interest. MAB also permits restricting the donor region thereby avoiding
linkage drag.
• Molecular markers enabled the identification of appropriate parents for
molecular breeding and also made it possible to select the desirable offspring at
the early developmental stages.
• Earlier, development of molecular markers, linkage map construction, QTL
mapping, and fine mapping of precise gene were considered to be labor-intensive
and time-consuming processes, but with the advancement of next-generation
sequencing (NGS), it has made the development of molecular markers, like simple
sequence repeats (SSR), insertion-deletions (InDels), and single-nucleotide
polymorphisms (SNPs) easier.
14. Genetic engineering
• Salinity tolerance is predominantly supervised by numerous genes as well as various physiological mechanisms.
• The technology of genetic transformation facilitates scientists to attain the transfer of gene in an accurate manner.
• That is why, scientists’ concern is on the plant transformation in order to improve the salt tolerance by operating the
osmoprotectant biosynthetic channel for the accumulation of molecules which perform by narrowing the lipid
peroxidation, function and structure of protein, ROS scavenging, etc.
• Engineering for salt-tolerant crops could be done by miRNA overexpression, maintenance of hormone homeostasis,
complete knowledge of post-translational modifications, fortunate fine-tuning of response to stress by engineering
innovative regulatory targets.
• Genes which are used for genetic engineering of salt-tolerant crops include water channel proteins, detoxifying genes,
dehydrins, osmoprotectants, ion transporter and molecular chaperons.
• In transgenic plants, S-adenosylmethionine decarboxylase (SAMSC) plays an important role in the biosynthesis of
polyamines and its activities are reported to be enhanced under different salt treatments. Ectopic expression of SAMDC-
like genes in rice enhanced the level of spm and spd that increased salt tolerance.
• In addition, the OstA and OtsB, two bifunctional fusion genes derived from E. coli in O. sativa are reported to increase
trehalose content, amino acids under salt stress.
• According to Li et al (2014), the overexpression of Oryza sativa trehalose phosphate synthase (OsTPS1) shows increased
trehalose synthesis and improved salt tolerance in transgenic plants.
• Similarly, proline and trehalose content were enhanced and upregulation of stress-related genes [responsive to ABA
(RAB16C)], early light-inducible protein (ELIP), water stress-inducible protein (WSI18) and heat shock protein (HSP70) in
transgenic rice.
15. CRISPR/Cas9
• CRISPR/Cas9 is a precise, systematic, and appropriate method of genome editing which was developed
recently in which the cas9 protein along with guide RNA form a complex for recognition of target sequences.
• In the system, the target DNA is cleaved by the Cas9 protein which consists of six domains namely REC1,
REC2, Bridge Helix, HNH, RuvC, and PAM interacting.
• The Rec1 domain helps in binding the guide RNA, whereas the bridge helix (arginine rich) initiates the
cleavage after binding of target DNA.
• The cas9 protein only activates when bind with guide RNA.
• The guide RNA is mainly composed of single-stranded RNA with 1 tetraloop and 2 or 3 stem loops, and it
must have a 5’ for complimentary with target DNA sequence.
• The cas9 protein searches for target DNA for PAM sequences.
• The protein melts the upstream bases of the PAM and pair with them.
• In the case of exact target sequence, RuvC and HNH nuclease play a role to cut the target DNA sequence
which then followed by the Watson-crick pairing between the DNA cas9sgRNA complex and guiding
sequence.
• Japonica rice cultivar WPB106 was resistant to drought, having good cooking quality and early maturity but
sensitive to salt. Its tolerance to salt has been improved by using CRISPR/ cas9 technology where they used
the Cas9-OsRR22- gRNA expression vector which knocks out the OsRR22 gene(Zhang et al 2019).
16. Hyperspectral imaging (HI)
• Imaging spectroscopy, it tells us about how the light interrelate with the materials which measure the
quantity of light transmitted, reflected, or emitted.
• Used for the identification of material via imaging system providing high spectral resolution when compared
with the multispectral system, namely Landsat multispectral scanners.
• HI system is based on the principles of red–green–blue (RGB) image in which an image is presented as a
matrix with I rows and J columns providing the I*J dimensions which determine the size of the image.
• In this system, pixels are fact point measurements in which each entry in the matrix represents with one
pixel.
• A pixel in an image represents the real space position which is absorbing and reflecting a light across the
electromagnetic spectrum.
• In this system, the reflected light is counted as a number which indicates the intensity.
• The low intensity of the wavelength is represented by the black image, while high intensity with white and
one wavelength showed greyscale image. The color bands lie within the electromagnetic spectrum of light
(400–800 nm) which corresponds to blue, green, and red visible lights.
• Hyperspectral imaging is a new technique used to evaluate tolerance to salt stress in wheat crop. Moghimi et
al (2018) used the four lines of wheat crop namely Kharchia, CS, Co, and Sp. It was concluded that among
the four lines, kharchia is more tolerant to salt than the others.
17. Genome-wide association studies(GWAS)
• GWAS, an important tool, provides an insight in the identification of genotype–phenotype
association and is mainly focused on linkage disequilibrium and recombination, and single feature
polymorphism.
• GWAS analysis includes the collection of data based on genotypic and phenotypic information in
which genotypic data can be collected with the help of microarrays or whole genome sequencing
(WGS) or whole exome sequencing (WES).
• Further, quality control is a major step in the analysis for the deletion of bad single-nucleotide
polymorphisms (SNPs) followed by imputation using matched reference populations from
repositories.
• Genetic association tests are conducted for each trait using various models (linear or logistic
regression).
• In silico analysis of GWAS is carried out for in silico fine-mapping, gene to function mapping,
genetic correlation, pathway analysis, and SNP to gene mapping.
• In a study conducted on Oryza sativa using GWAS mapping revealed the novel QTLs at the
seedling stage for salinity stress tolerance. GWAS analysis identified 26 QTLs after screening of
179 rice landraces genotyped with 21,623 SNP markers for salinity stress tolerance (Le et al 2021).
• GWAS is used to recognize markers for salt tolerance in rice crop (Patishtan et al 2018).
18. Conclusive remark and future prospects
• Recent studies mainly focused on the molecular basis which needs more study.
• Studies on salinity tolerance explained that several salinity responses, osmotic
regulation, antioxidant metabolism, hormone metabolism, and signaling
pathways play a crucial role in stress tolerance.
• Moreover, new emerging approaches of plant breeding and biotechnologies such
as GWAS, mutational breeding, marker assisted breeding (MAB), double haploid
production (DH), hyperspectral imaging (HI), and CRISPER/Cas, serve as
engineering tools for dissecting the mechanism in more depth.
• However, understanding of these mechanisms creates a loop of concept for
breeders with more focus on plant performance under saline conditions.