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SEED PHYSIOLOGY, PRODUCTION & TECHNOLOGY

Dehydrin-Like Proteins in Soybean Seeds in Response to Drought Stress during Seed Filling

^a Dep. of Crop Production, Jordan Univ. of Science and Technology, Irbid P.O. Box 3030, 22110, Jordan
^b Dep. of Agronomy, Iowa State Univ., Ames, IA 50011

^* Corresponding author (nsamarah{at}just.edu.jo)

There is no information on accumulation of dehydrin proteins during seed development and maturation of soybean [Glycine max (L.) Merr.] in response to drought stress. Our objective was to study accumulation of dehydrin-like proteins in developing soybean seeds in response to drought stress. A greenhouse experiment and a field experiment were conducted. In the greenhouse experiment, three treatments were imposed on soybean plants after beginning of linear seed filling (R₅): well-watered (WW), gradual stress (GS) imposed before severe stress, and sudden severe stress (SS). In the field treatments were irrigation (I) and nonirrigation (NI) (rainfed) conditions imposed from R₅ to R₈ (mature seeds). Greenhouse results indicated dehydrin-like proteins (28 and 32 kDa) were detected 18 d after R₅ (R_5.8) in developing seeds from drought-stressed plants but not in seeds from the well-watered plants. In the mature seeds, dehydrin-like proteins (28, 32, and 34 kDa) were detected in seeds from drought-stressed plants as well as the well-watered plants. In the field, dehydrin-like proteins accumulated similarly under irrigation and nonirrigation conditions, with the first detection for dehydrins (28 and 32 kDa) at 22 d after R₅ (R₆). Accumulation of dehydrin-like proteins was maximal in seeds harvested at 43 d after R₅ (seed physiological maturity).