Abstract
We applied a comparative physiology and proteomic analysis to decipher the differential responses of two contrasting wheat genotypes to drought stress. Based on physiological measurements the tolerant genotype (SE) showed better drought response by developing deep root system, higher root and shoot biomasses, and higher level of ABA in leaves. Proteomic analysis showed an increased abundance of proteins related to defense and oxidative stress responses such as GLPs, GST, and SOD, and those related to protein processing such as small HSPs in roots of both genotypes in response to drought stress. In addition, the abundance of proteins such as glucan endo-1,3-beta-glucosidase, peroxidases, SAMS, and MDH increased in roots or leaves of the tolerant genotype (SE) and decreased in that of the sensitive genotype (SW). Overall, proteins related to oxidative stress, protein processing and photosynthesis showed decreased abundance to a greater extent in the sensitive genotype (SW).
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