Variability in senescence pattern and membrane stability in wheat genotypes under normal and late sown conditions
2009
Pandey, S.K. | Srivastava, J.P.
A field experiment was conducted during rabi season to find out the senescence pattern and membrane stability of flag leaf and their relationships with yield in three genotypes of wheat (HUW¬234, HUW -468 and Chirya-3) under normal and late sown conditions. Changes in chlorophyll content of flag leaf of mother shoot were recorded at 5, 10, 15, and 20 days after anthesis. The chlorophyll content in the flag leaf of main shoot (MS) decreased rapidly after 10 days of anthesis and more so in genotype HUW -468 and Chirya-3 under late sowing and resulted in lower mean chlorophyll content. On the other hand, mean electrolyte leakage under late sowing was more in genotype HUW-234 and HUW -468. Chirya-3 exhibited lesser damage in flag leaf cell membrane under late sown conditions. The study showed that the major reduction in main shoot and yield under late sowing was due to a decrease in grain number Pter ear. Genotypic differences existed with respect to sustenance of grain weight per ear and cell membrane stability under terminal heat stress in wheat. An ability to sustain higher grain weight along with cell membrane stability under heat stress is therefore, desired for higher yield under late sown conditions.
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