New and old ways of looking at shape: morphometric analysis of leaves

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Desabastecimiento, descrédito, violencia. Tras una década de beneficios sociales y aparente prosperidad, Venezuela vuelve a exhibir en 2016 indicadores como los que antecedieron al Caracazo de 1989. Cercado por la presión política de una crisis socio-económica fuera de control, el régimen de Nicolás Maduro se aproxima a lo que diversos analistas consideran el fin del último episodio de la temporada socialista sudamericana.

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Genetic characterization of morphological and yield traits in ten genotypes of Celosia argentea L. was evaluated at the Research Farm of the Department of Botany, University of Ibadan, Nigeria. The experiment was laid out in a randomized complete block design with four replicates. The results of analysis of variance carried out on early morphological characters of C. argentea L. at 3, 4, and 5weeks after sowing showed significant (p<0.05 /><0.01) effects except for number of leaves per plant and leaf width at 3 and 5 weeks after sowing, respectively. The replicates in blocks produced varying observable effects on the genotypes while genotype x replicate showed significant variation on morpho-agronomic and yield traits except number of days to flowering at 50 days and fruit length at maturity. Also, from the result of the mean separation, it is shown that NG/MAY/09/015 performed the best for plant height at flowering, leaf length at flowering, leaf width at flowering, and root biomass. NG/SA/07/213 produced the highest mean values of number of flowers per plant, leaf biomass and pod weight at maturity. The highest values of number of primary branches and fruit length at maturity (FLM) were observed for NG/TO/MAY/09/015, while NG/AO/MAY/09/015 had the highest for pod weight at maturity. The result of principal component axis also showed that Prin 1 accounted for highest Eigen Vector of 38.62% from the total variation. NG/MAY/09/015 (R2) genotype produced the highest Eigen Vector of 6.705 from Prin 1. The correlation result showed that plant height had a significant positive association with seed weight at maturity, pod weight at maturity, number of primary branches and fruit length at maturity, while similar association existed between leaf biomass, number of primary branches and pod weight at maturity, as well as between plant height at flowering and pod weight at maturity. Again, the number of primary branches is also positive and significantly correlated with plant height, root biomass and leaf length. Furthermore, the results of dendrogram and minimum spanning tree revealed variations in genetic relatedness and distance, respectively, which exist among the population of the C. argentea L.

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Decalepis hamitonii Wight & Arn plants were collected from 5 accessions [i.e., Bannerughatta, Bidadi, Devarayanadurga, Kyatasandra and Savanadurga] and analyzed for morphlogical and anatomical features. The plant exhibited milky latex which is sticky in nature, slightly thicker as compared to that of latex obtained from the members of Asclepiadacaeae and Moraceae. The external morphology of the shrub revealed an woody climber/ liana which produced roots that were pubescent in nature. One of the interesting feature in Decalepis hamitonii Wight & Arn i.e., stout roots without latex but there were presence of mucilagenous fluid which was sticky. The root exhibited variation in pubescent odour which was not detected in other families and genera., ex: Hemidesmus indicus (L.)R.Br. do not possess pubescent odour. Leaves obovate, leaf apex obtuse, base wedge shaped which was a significant character of Decalepis hamitonii Wight & Arn and flowers were trichotomously branched with solitary cyme., floral tube just minute with of 1 mm length. Unlike the altered varieties resembled with those species of Hemidesmus as well. The cultivation of Decalepis hamitonii Wight & Arn in in-vivo condition incured heavy loss or change in morphological features due to climatic conditions. Study of the characters of Decalepis hamitonii Wight & Arn was instantly carried out and analysis revealed that maintainence and protection of wild varieties along with respective characteristics without change in morphology can be done. Naveen Kumar. S. P | Maya. C"Evaluation of morphological and anatomical characters on growth of Decalepis hamiltonii wight & arn. In selected regions of Southern Karnataka" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-4 , June 2018, URL: http://www.ijtsrd.com/papers/ijtsrd14132.pdf http://www.ijtsrd.com/biological-science/botany/14132/evaluation-of-morphological-and-anatomical-characters-on-growth-of-decalepis-hamiltonii-wight-and-arn-in-selected-regions-of-southern-karnataka/naveen-kumar-s-p

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The primary distinction between a test cross and a backcross is that a test cross is used to determine the genotype of a phenotypically dominant individual, whereas a backcross is used to recover a dominant genotype from a parent who has an extreme genotype. The hybrids that are backcrossed are known as 'BC' hybrids. For example, a BC1 hybrid is an F1 hybrid that was crossed with one of its parents or a genetically similar species. The BC2 hybrid is defined as a BC1 hybrid that has been crossed with the same parent or genetically similar species. Other instances include backcrossing in animals. A system of breeding in which repeated backcrosses are made to transfer a specific character to a well-adapted variety for which the variety is deficient is referred to as backcross breeding This approach is infrequently utilized in vegetatively propagated crops such as sugarcane and potatoes, and only with slight alterations. A test cross is a genetic technique for determining an unknown genotype in a dominant person. It is a breeding procedure in which a (known genotype) homozygous recessive individual is paired with an individual of the opposite mating type who has an unknown dominant genotype. The phenotypic characteristics of the resulting children are investigated, and the genotype of the examined individual is determined appropriately. If all of the progeny from the test cross are dominant, we may conclude that the genotype of the tested unknown person is homozygous dominant. If 50% of kids exhibit dominant traits and the remaining 50% exhibit recessive traits, we may conclude that the genotype of the tested unknown individual is heterozygous dominant. #genetics #backcross #testcross #mendel #crosses #monohybridtestcross #backcrossandtestcross #typesofcross #dihybridtestcross #limitationsofcross #applicationsofcross #mscbotany #botany

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Cotton crops are vulnerable to a variety of sucking pests, which can severely impact plant health, yield, and fiber quality. These pests primarily feed on plant sap, extracting nutrients directly from the plant's vascular system. Here's a breakdown of some of the most significant sucking pests in cotton cultivation: Aphids: Cotton aphids or melon aphids can cause direct damage by sucking sap and indirect damage by secreting honeydew, which encourages sooty mold growth. This can interfere with photosynthesis and weaken the plant. Aphids can also transmit viral diseases. Whiteflies: Two species, the silverleaf whitefly and the bandedwinged whitefly, are particularly troublesome. They not only suck sap from the underside of leaves, causing yellowing and leaf drop, but their honeydew excretion promotes sooty mold and they can transmit several plant viruses. Thrips: While thrips can chew on plants, their primary damage to cotton is through sucking. They attack the cotton plant during its seedling stage, which can stunt growth and reduce vigor. Thrips are also capable of transmitting the Cotton Bud disease. Spider Mites: These are not insects but arachnids. Spider mites, such as the two-spotted spider mite, suck cell contents from the leaves, leading to speckled discoloration and potentially significant leaf loss if infestations are severe. Leafhoppers: Including various species, leafhoppers can cause direct damage through feeding, which results in leaf curling and stunted growth. They can also be vectors for plant diseases. Mealybugs: These pests are less common but can be problematic, especially in clustered planting conditions. They suck sap and secrete honeydew, which leads to sooty mold. Mealybugs can also spread viruses. Stink Bugs: Although primarily known for their chewing mouthparts, certain stink bugs can cause damage similar to sucking pests by injecting saliva into the plant and sucking out nutrients, leading to boll damage and stained lint. Management Strategies: Cultural Controls: This includes practices such as crop rotation, using resistant varieties, and managing planting and harvesting times to avoid peak pest populations. Biological Controls: Beneficial insects like lady beetles, lacewings, and predatory mites can naturally control sucking pest populations. Parasitic wasps also play a role in controlling aphid and whitefly populations. Chemical Controls: Insecticides may be used but should be chosen carefully to minimize resistance development and preserve beneficial insects. Systemic insecticides can be particularly effective against sucking pests. Integrated Pest Management (IPM): Combining multiple control strategies based on monitoring and thresholds to apply the most effective and environmentally sensitive approach. Effective management of sucking pests in cotton requires a thorough understanding of the pest species present, their life cycles, and the ecological balance of the field environment.

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Labelling Requirements and Label Claims for Dietary Supplements and Recommend...

Lokesh Kothari

Mustard, as a crop, is susceptible to a variety of pests that can affect its growth and yield. Here’s a rundown of some common pests that target mustard plants: Aphids: These small, sap-sucking insects can cause significant damage by feeding on the leaves and stems. Aphids also excrete a sticky substance known as honeydew, which can lead to the growth of sooty mold on the plants. Flea Beetles: These tiny beetles jump like fleas when disturbed and chew small holes in the leaves. They are particularly damaging in the early growth stages of the plant. Cabbage Loopers: The larvae of a type of moth, these caterpillars are known for their distinctive looping movement. They chew large holes in the leaves and can defoliate plants if present in large numbers. Diamondback Moth Larvae: Another caterpillar pest, these larvae chew small holes in the leaves and can cause extensive damage, especially when infestations are heavy. Whiteflies: These are tiny, winged insects that feed on plant sap and can quickly become a problem in greenhouse or close planting conditions. Like aphids, they also secrete honeydew. Cutworms: These are the larvae of certain types of moths and are known for cutting young plants at the stem base at ground level. They are most destructive during the night. Root Maggots: The larvae of root maggot flies, these pests attack the roots of mustard plants, causing wilting and potentially killing young plants. Harlequin Bugs: These are colorful stink bugs that suck the sap from mustard plant stems and leaves, causing the leaves to become stippled, wilt, and eventually die if the infestation is severe. Mustard Sawfly: The larvae of the mustard sawfly can cause considerable defoliation, as they feed voraciously on the leaves. Clubroot: Caused by a fungus-like organism, clubroot affects the roots, causing them to swell and distort. While technically a disease, it is often associated with pest management because controlling it involves similar preventative strategies. Control Measures: Managing pests in mustard involves a combination of cultural, biological, and chemical methods. Crop rotation, resistant varieties, timely sowing, maintaining plant health, and using natural predators like ladybugs and parasitic wasps can help keep pest populations under control. Chemical pesticides should be used as a last resort due to their potential impact on the environment and non-target species.

Pests of mustard_Identification_Management_Dr.UPR.pdf

PirithiRaju

Context. Determining the size distribution of asteroids is key to understanding the collisional history and evolution of the inner Solar System. Aims. We aim to improve our knowledge of the size distribution of small asteroids in the main belt by determining the parallaxes of newly detected asteroids in the Hubble Space Telescope (HST) archive and subsequently their absolute magnitudes and sizes. Methods. Asteroids appear as curved trails in HST images because of the parallax induced by the fast orbital motion of the spacecraft. Taking into account the trajectory of this latter, the parallax effect can be computed to obtain the distance to the asteroids by fitting simulated trajectories to the observed trails. Using distance, we can obtain the absolute magnitude of an object and an estimation of its size assuming an albedo value, along with some boundaries for its orbital parameters. Results. In this work, we analyse a set of 632 serendipitously imaged asteroids found in the ESA HST archive. Images were captured with the ACS/WFC and WFC3/UVIS instruments. A machine learning algorithm (trained with the results of a citizen science project) was used to detect objects in these images as part of a previous study. Our raw data consist of 1031 asteroid trails from unknown objects, not matching any entries in the Minor Planet Center (MPC) database using their coordinates and imaging time. We also found 670 trails from known objects (objects featuring matching entries in the MPC). After an accuracy assessment and filtering process, our analysed HST asteroid set consists of 454 unknown objects and 178 known objects. We obtain a sample dominated by potential main belt objects featuring absolute magnitudes (H) mostly between 15 and 22 mag. The absolute magnitude cumulative distribution logN(H > H0) ∝ αlog(H0) confirms the previously reported slope change for 15 < H < 18, from α ≈ 0.56 to α ≈ 0.26, maintained in our case down to absolute magnitudes of around H ≈ 20, and therefore expanding the previous result by approximately two magnitudes. Conclusions. HST archival observations can be used as an asteroid survey because the telescope pointings are statistically randomly oriented in the sky and cover long periods of time. They allow us to expand the current best samples of astronomical objects at no extra cost in regard to telescope time.

Hubble Asteroid Hunter III. Physical properties of newly found asteroids