Water Stress Induced Proline Accumulation in Contrasting Wheat Genotypes as Affected by Calcium and Abscisic Acid |
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Authors: | H Nayyar DP Walia |
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Institution: | (1) Department of Botany, Panjab University, Chandigarh, 160014, India;(2) Department of Fruit Breeding and Genetic Resources, U.H.F., Nauni, Solan, India |
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Abstract: | Proline accumulation and mobilization in roots of 7-d-old seedlings of wheat genotypes varying in sensitivity towards water
stress were compared. Water stress was induced by polyethylene glycol (PEG-6000; osmotic potential −1.5 MPa) in the presence
of 0.1 mM abscisic acid (ABA), 1 mM calcium chloride, 0.5 mM verapamil (Ca2+ channel blocker), 0.5 mM fluridone (inhibitor of ABA biosynthesis). While both the genotypes did not differ in total proline
accumulation, rate of proline accumulation and utilization was higher in tolerant genotype C 306 as compared to susceptible
genotype HD 2380. The treatment with ABA and CaCl2 caused further increase in proline accumulation during stress and reduced its mobilization during recovery. The membrane
stability and elongation rate of roots was observed to be higher at ABA and calcium treatment in both the genotypes under
stress. As was evident from inhibitor studies, the tolerant genotype was more responsive to ABA and the susceptible one to
calcium.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | apparent proline mobilization rate fluridone membrane stability index root elongation rate Triticum aestivum verapamil |
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