ICAR Research Data Repository for Knowledge Management
PHYSIOLOGICAL BASIS OF CYTOKININ INDUCED DROUGHT TOLERANCE IN WHEAT (Triticum aestivum L.)
KrishiKosh
View Archive Info| Field | Value | |
| Title |
PHYSIOLOGICAL BASIS OF CYTOKININ INDUCED DROUGHT TOLERANCE IN WHEAT (Triticum aestivum L.)
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| Creator |
SHIVANI NAGAR
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| Contributor |
Ajay Arora
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| Subject |
planting, irrigation, cytokinins, developmental stages, wheats, enzymes, weather hazards, chlorophylls, proteins, inorganic acid salts
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| Description |
T-8482
Wheat is one of the premier cereal crops of worldwide importance and India is second largest producer of wheat. Water stress is a worldwide problem, which is a severe threat for sustainable production of wheat. Water stress during wheat developmental stages limits production and its extent vary with stage at which plant encounters water stress. PGRs plays important role in plant response to water stress, cytokinin is important among them it can induce water stress tolerance by delaying leaf senescence. The present study was conducted to determine the effect of cytokinin treatment under two different water regimes (Control and water stressed) in two contrasting cultivars, water stress tolerant C-306 and water stress susceptible PBW-343. In water stressed plants significant reduction were observed in traits related to photosynthesis which includes RWC, MSI, chlorophyll and carotenoid content, photosynthesis rate, stomatal conductance, photochemical efficiency, total sugar and total starch content. Cytokinin (BAP; 40 μM) treated plants were observed with higher activity of all the parameters studied in relation to photosynthesis and related traits in both the wheat cultivars under moisture deficit condition. Expression of Rubisco SSU was highest at anthesis stage but there was no significant effect due to cytokinin treatment under both water regimes. DHN and COR gene expression was more under water stress condition and expression was found to be increased on later developmental stages with no significant effect of cytokinin treatment. Nitrogen metabolism in plants is severely affected by water stress. There was decrease in activity of enzymes of nitrogen assimilation pathway viz., nitrate reductase and glutamine synthetase which led to decrease in plant total nitrogen and total protein content. However, application of cytokinin was found effective under water stress to enhance activity of these enzyme and further increased leaf nitrogen and protein content in both cultivars. Total protease activity was enhanced significantly during water stress condition but it was decreased by application of cytokinin. Under water stress condition there was significant decrease in leaf area and total biomass of plants which increased by treatment of cytokinin in both wheat cultivars. Yield related attributes also showed enhancement due to application of cytokinin in both the cultivars under water stress conditions. However, sensitive cultivars PBW-343 was found more responsive to cytokinin treatment under water stress condition, in comparison to drought tolerant cultivar C-306. |
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| Date |
2016-11-24T14:02:03Z
2016-11-24T14:02:03Z 2011 |
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| Type |
Thesis
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| Identifier |
http://krishikosh.egranth.ac.in/handle/1/87417
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| Format |
application/pdf
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| Publisher |
DIVISION OF PLANT PHYSIOLOGY
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