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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.
 
Creator SHARAD KUMAR DWIVEDI
 
Contributor Ajay Arora
 
Subject Wheat, drought, PGRs and antioxidants
 
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.
 
Date 2016-08-19T15:27:54Z
2016-08-19T15:27:54Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/73062
 
Format application/pdf
 
Publisher IARI, DIVISION OF PLANT PHYSIOLOGY