Drought and abscisic acid (ABA) induced changes in protein and pigment contents of four wheat (Triticum aestivum L.) accessions
2010
Iqbal, S. (Quaid-i-Azam Univ., Islamabad (Pakistan). Dept. of Plant Sciences) | Bano, A. (Quaid-i-Azam Univ., Islamabad (Pakistan). Dept. of Plant Sciences) | Ilyas, N. (Quaid-i-Azam Univ., Islamabad (Pakistan). Dept. of Plant Sciences)
The response of four wheat (Triticum aestivum L.) accessions (011251, 011417, 011320 and 011393) to drought and exogenously applied abscisic acid was determined in a pot study conducted at Quaid-i-Azam University, Islamabad, Pakistan during wheat-growing season 2005 and 2006. For this purpose water, total chlorophyll and caratenoid content of leaves at booting and grain-filling stages were measured. Sampling was done 3, 6 and 9 days after drought induction. Recovery was studied at 48 and 72 hours of rewatering. Marked decreases in leaf water potential as well as pigment content occurred under drought stress. Increase in protein content under drought remained a dominant response except for accession 011251. Accession 011320 was found to be the most sensitive among all accessions on the basis of greater decrease in water potential. The inhibitory effects of water stress on plant water status and biochemical contents were ameliorated by exogenous application of ABA.
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