Physiological Basis of Cytokinin induced Drought Tolerance in Wheat (Triticum aestivum L.)
Abstract
Understanding of physiological mechanisms that enable wheat (Triticumaestivum L.)plants to adapt to water deficit stress condition and maintain growth and productivity during stress period is very important.Experiments werecarried out to screen the twenty five minicore wheat germplasms for water deficit stress tolerance and to study the effect of cytokinin (BA;40 µM) on physiological traits, photosynthesis and gas exchange parameters under two different water regimes in four contrasting wheat cultivars viz., HD 2987 and DBW 44 (relatively drought tolerant), HD 2888 and HD 2733 (relatively drought susceptible),differing in their tolerance to drought. Sampling was done at vegetative growth stage (35-40DAS) of wheat development. Study revealed that there was reduction in plant water status (RWC), membrane stability index (MSI), photosynthetic efficiency (Chlorophyll and photosynthesis) during water deficit stress condition. Application of cytokinin improves the physiological traits in terms of MSI, RWC, and photosyntheticrateat the vegetative stage of wheat.References
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