DELAYED LEAF SENESCENCE ASSOCIATED DROUGHT TOLERANCE MECHANISM IN WHEAT (Triticum aestivum L.)
KrishiKosh
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Title |
DELAYED LEAF SENESCENCE ASSOCIATED DROUGHT TOLERANCE MECHANISM IN WHEAT (Triticum aestivum L.)
Ph.D. |
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Creator |
SHARAD KUMAR DWIVEDI
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Contributor |
Ajay Arora
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Subject |
Wheat, drought, PGRs and antioxidants
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Description |
T-8791
Survival under stressful condition depends on the plant’s ability to perceive the stimulus, generate and transmit the signals and initiate various physiological and chemical changes. The antioxidant defenses appear to provide crucial protection against oxidative damage in cellular membranes and organelles in plants grown under unfavourable conditions which is more pronounced at reproductive stage. An experiments was conducted to study the effect of PGRs in combination {TDZ; 0.01 μl/L + PBZ; 30 μl/L + AsA; 100 μl/L} on oxidative stress, antioxidant system and water deficit stress markers under two different water regimes in four contrasting wheat cultivars differing in their tolerance to drought at pre-anthesis (67-70 days), anthesis (77- 80 days) and post-anthesis (87-90 days) stages of wheat development. The results revealed that, enhancement in enzymic (SOD, CAT, POX, APX) as well as non-enzymic (ascorbic acid; AsA) antioxidants and oxidative stress (lipid peroxidation and LOX) activity during water deficit stress condition. However, combined application of PGRs improves the antioxidants capacity and down regulates the oxidative stress. Further, the PGRs application down regulated the activity of water deficit stress markers such as proline, ABA and ethylene under drought condition. While, PGRs could able to enhanced the expression level of abiotic stress related genes such as aquaporin (AQP), dehydrin (DHN) and pyrolline-5-carboxylase synthase (P5CS) as a drought protective mechanism. |
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Date |
2016-08-19T15:27:54Z
2016-08-19T15:27:54Z 2013 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/73062
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Format |
application/pdf
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Publisher |
IARI, DIVISION OF PLANT PHYSIOLOGY
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