Photorespiration - Introduction, why is it occur in plants, pathway of photorespiration, Enzymes names, pathway step by step explanation, Benefits of photorespiration, additional information related to photorespiration, Rubisco enzyme, Oxygenase enzyme, Oxygen concentration higher leads to photorespiration, problem to carry out calvin cycle.
This power point presentation consisting of 41 slides is an attempt to describe what is photorespiration,major photorespiratory pathway in C3 plants ,why photorespiration doesnot take place in C4 plants,structure of Rubisco enzyme ,difference between Photorespiration and Dark respiration and Significance of Photorespiration
intro-hostory and discovery-characteristics of phytochrome-chemical nature of phytochrome-mode of action-mechanism-phytochrome mediated physiological responses-phytochrome is a pigment system:some evidences-role of phytochrome
what is photosynthesis?-history background-photosynthetic pigmment system-light harvesting complex-photo oxidation of water-photophosphorylation and mechanism of electron transport
This power point presentation consisting of 41 slides is an attempt to describe what is photorespiration,major photorespiratory pathway in C3 plants ,why photorespiration doesnot take place in C4 plants,structure of Rubisco enzyme ,difference between Photorespiration and Dark respiration and Significance of Photorespiration
intro-hostory and discovery-characteristics of phytochrome-chemical nature of phytochrome-mode of action-mechanism-phytochrome mediated physiological responses-phytochrome is a pigment system:some evidences-role of phytochrome
what is photosynthesis?-history background-photosynthetic pigmment system-light harvesting complex-photo oxidation of water-photophosphorylation and mechanism of electron transport
dark reactions in plants botany calvin cycle biosynthetic pathway photosynthesis stages of photosynthesis steps of Calvin cycle carboxylation
reduction regeneration end products of calvin cycle
Photosynthesis is an inevitable process that keeps us alive.It is the main source for food and it's byproduct keeps us breathing. This ppt is the detailed explanation of photosynthesis and the components involved in it. Here you can easily understand the concept and you are able to strengthen your grip on this topic.
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Reducing sugar definition and example, non-reducing sugar definition and example, Estimation of reducing sugar by DNSA method, Estimation of total sugars by anthrone metod, Estimation of non-reducing sugar from amount of total sugars and reducing sugar, formula for estimation of non-reduci
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Enzyme - Introduction, Biocatalysts, Definition of enzymes, Types of enzymes, classification of enzyme, Nomenclature of enzymes, EC number, Types of enzymes with examples, and reaction.
Enzymes properties, nomenclature and classificationJasmineJuliet
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Glycoprotein - Introduction, Structure, Significance. Lectin - Introduction, Structure, Significance. Lipid definition, Some review questions related to Glycoprotein and lectins
Polysaccharide introduction, example, structure, starch, cellulose, chitin those structure and important functions and their presence in plants and animals, polysaccharide types based on functions and their composition , functions of polysaccharides , important images for relevant polysaccharides types, polysaccharide role in plants and animal cells. Starch - structure and functions, cellulose structure and functions, chitin - structure and functions
Copper -trace element, Biochemical role of copper, RDA of copper, Deficiency diseases of Copper, Cobalt - Introduction, Biochemical role of cobalt, RDA of cobalt, Deficiency diseases of cobalt, Selenium - introduction, Biochemical role of selenium, RDA of selenium, Deficiency diseases of selenium
Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
Andreas Schleicher presents at the OECD webinar ‘Digital devices in schools: detrimental distraction or secret to success?’ on 27 May 2024. The presentation was based on findings from PISA 2022 results and the webinar helped launch the PISA in Focus ‘Managing screen time: How to protect and equip students against distraction’ https://www.oecd-ilibrary.org/education/managing-screen-time_7c225af4-en and the OECD Education Policy Perspective ‘Students, digital devices and success’ can be found here - https://oe.cd/il/5yV
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In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
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2. Photorespiration - Introduction
Photorespiration is a metabolic pathway that occurs in
photosynthetic organisms and releases carbon dioxide,
consumes oxygen, and produces no chemical energy or
food.
This process limits the growth rates of plants.
Photorespiration generally occurs on hot, dry, sunny days
causing plants to close their stomata and the oxygen (O2)
concentration in the leaf to be higher than the carbon
dioxide (CO2) concentration.
4. Photorespiration - Introduction
When a plant leaf contains a high concentration of
oxygen, instead of carbon dioxide, this poses a problem
for the normal photosynthetic process, including the
light reactions and the Calvin cycle.
5.
6. Photorespiration - Oxygenase
Photorespiration involves the light dependent uptake of
O2 and evolution of CO2 during photosynthesis in green
plant tissues.
The first step in photorespiration is associated with the
oxygenase activity of the photosynthetic enzyme
Rubisco.
8. Photorespiration - Pathway
The reactions of photorespiration cycle occur in three organelles:
chloroplasts, peroxisomes, and mitochondria.
The C2 cycle is initiated in the chloroplast with the formation of
2-phosphoglycolate, which is subsequently converted to glycolate
and Pi by the action of phosphoglycolate phosphatase.
The glycolate exits the chloroplast and enters into the
peroxisome.
9. Photorespiration - Pathway
The glycolate reacts with O2 to produce
glyoxylate and H2O2 which is catalysed by
glycolate oxidase.
Two molecules of glyoxylate are aminated to
form glycine in a reaction catalysed by
glutamate:glyoxylate aminotransferase.
H2O2 is removed by the abundant catalase present
in peroxisomes to H2O and O2.
10. Photorespiration - Pathway
The glycine produced in the peroxisome moves into the
mitochondria.
For every two molecules of glycine, one molecule of serine, CO2
and NH3 is produced, and one NAD+ is reduced to NADH.
This takes place through the action of glycine decarboxylase
complex.
One CO2 is produced for every two molecules of O2 taken up by the
action of RuBP oxygenase.
11. Photorespiration - Pathway
The serine produced in the mitochondria now moves into the peroxisome,
where it is deaminated to hydroxypyruvate by serine:glyoxylate
aminotransferase.
Then, hydroxypyruvate is reduced to glycerate by hydroxypyruvate
reductase.
The glycerate exits the peroxisome and enters the chloroplast and is
phosphorylated by glycerate kinase to 3-phosphoglycerate.
This reaction completes the conversion of two molecules of
phosphoglycolate to one of 3-PGA, which can now enter the C3 cycle.
13. Photorespiration - Benefits
Photorespiration have some benefits for plants.
There's some evidence that photorespiration can have:
Photoprotective effects (preventing light-induced
damage to the molecules involved in
photosynthesis),
Help maintain redox balance in cells, and
Support plant immune defenses.
14. Photorespiration (C2 cycle)
Additional information:
The 2-phosphoglycolate is a very toxic
product and cell cannot metabolise it. So, to
bypass this photorespiration takes place in
some higher plans.