Studies on biochemical basis for cotton leaf curl disease tolerance in Gossypium hirsutum L.
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Date
2018
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CCSHAU
Abstract
Viruses have profound effect on the growth and productivity of plants. With reference to the cotton crop, CLCuD
caused by CLCuBuV has been recognized as a serious threat to cotton production in Indian subcontinent. Information on
cotton and CLCuV interaction is still not convincingly explained. In the present study, the constituents like RWC, electrolyte
leakage, total chlorophyll content, MDA content, total soluble protein, total sugar content, total phenolics, H2O2, gossypol
content and the activities of defense related proteins viz. POX, PPO, CAT and PAL were scrutinized at different stages of
infestation in GCH 3, HS 6 genotypes of cotton and in additional genotype (HD 432) to look over the biochemical basis for
CLCuD tolerance mechanism. It was found that the maximum RWC, total chlorophyll content and total soluble protein was
present in highly tolerant and resistant genotype respectively at 0 DAI. Decline in the amount of these constituents reported
in all genotypes but maximum loss took place in HS 6. Least amount of electrolyte leakage, H2O2 and MDA content was
present in HD 432 at all stages of infestation. Significant increase in these parameters observed in HS 6 post incursion of
virus. Maximum total sugar content was present in HS 6 at 0 DAI, ebb was more in GCH 3 due to infestation. As a
consequence of viral infection, the level of total phenolic compounds and gossypol content increased significantly in all
genotypes while maximum increase was in GCH 3. With the progression of infestation period significant increase was
reported in the activities of PAL, PPO, POX and CAT in all genotypes. Thus, the increase in the level of total phenolic
compounds, gossypol with increase in the activities of all studied enzymes can be correlated with the potency of the plant to
strive against CLCuD.
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