Effect of post anthesis high temperature stress on growth, physiology and antioxidative defense mechanisms in contrasting wheat genotypes: Ind J Plant Physiol; ( 2015)
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Date
2015
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Indian Journal of Plant Physiology :An International Journal of Plant Physiology
Abstract
An experiment was conducted to study the effect
of post anthesis high temperature stress on morphophysiological
characters, antioxidants and yield of four
wheat genotypes. Seeds were sown in the field under normal
(15th November) and late sown (15th December)
condition. High temperature stress caused significant reduction
in photosynthetic parameters, relative water content,
membrane stability and chlorophyll content in all the
genotypes, with variable magnitude. Activities of superoxide
dismutase, catalase, peroxidase and ascorbate peroxidase
increase as a consequence of high temperature
conditions. Higher enhancement in activities of antioxidant
enzymes under late sown condition was observed in RAJ
4083. There were general reduction in yield and yield
contributing parameters but the tolerant genotypes RAJ
4083 and RAJ 4037 maintained higher yield by maintaining
relatively higher grain weight and grain number. The
effect of high temperature was variable among four wheat
genotypes but RAJ 4083 performed the best. It is suggested
that heat tolerance of RAJ 4083 could be due to enhanced
photosynthetic efficiency, chlorophyll retention, membrane
stability and antioxidative defense mechanism under late
sown condition. The study also underlines the protective
role played by antioxidant enzymes under heat stress and
their significance as the basis of the tolerance to high
temperature
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Plant Physiology