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KrishiSewa - Agriculture Knowledge for Indian Farmers

hormone Tag

24 Jul

Posted at 05:42h in Miscellaneous
M. Dhole 18 views

फाईटोमैलाटोनि‍न: पौधों में जैवि‍क तथा अजैवि‍क तनाव प्रबंधन के लिए पौधा हार्मोन The science behind plants stress tolerance to biotic and abiotic stresses always remained interesting and important to enhance the crop productivity in arid and semiarid regions all over the world. Today different stresses arise due to climate change, as well as due to natural and man made activities. Melatonin, once discovered in vertebrates as a hormone of the pineal gland, is now known to be formed in bacteria and numerous taxa of eukaryotes including various algae of different phylogenetic position and plants. It is biochemically N-acetyl-5-methoxytryptamine; biogenic indoleamine, structurally related to tryptophan, tryptamine, serotonin and indole-3-acetic acid (IAA). This hormone is involved in physiological activities. Plants accumulate high levels of melatonin when faced with harsh environments (Arnao and Ruiz, 2015; Zhang et al., 2014) and exogenously applied melatonin helps to improve tolerance to stresses. Melatonin ubiquitously present in organisms whose metabolism based on oxygen, so speculated that its primary function to protect organisms against oxygen toxicity. Melatonin in plants has been detected by several methods including radio Immuno Assay (RIA), enzyme-linked immunosorbent assay (ELISA), gas chromatography-mass spectrometry (GS-MS), and high-performance liquid chromatography (HPLC) with electrochemical detection (HPLC-ECD), fluorescence detection (HPLC-FD), or HPLC-MS (Nawaz et al., 2016). Phytmelatonin synthesis Phytomelatonin synthesized from tryptophan with the help of...

26 Apr

Posted at 08:52h in Crop Cultivation
Puja Rai 17 views

फूलों की खेती में प्लांट ग्रोथ रेगुलेटर की भूमिका The use of PGR's in modern horticulture is well established, more particularly horticulture in industrially advanced countries and their application is fast picking up in the developing nations as well. In fact PGRs have become integral component of agro-technical procedures of cultivated ornamental crops, since the regulations for usage of chemicals in ornamental crops are less stringent unlike those in food crops. Thus their application in these crops has been extended to alter a variety of responses. Some plant species or cultivars are responsive to specific PGRs, but not all PGRs. Hormone can be defined as a substance produced in one part of the organism and transferred to another part of the same organism where it affects a specific physiological function. The hormones are required only in minute quantities to produce large specific physiological process. The term growth regulator is applied to organic compounds,  other than nutrients, which when used in minute quantities can either inhibit, stimulate, or alter growth. These broadly grouped in to two, growth promoters which stimulates or alters the growth favourably and growth retardants are those which inhibit or alter the growth negatively. Ornamental crops find extensive use of growth regulators for modifying their developmental processes. Within the broad group of plant...