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Plant Sciences Research
Year: 2008  |  Volume: 1  |  Issue: 3  |  Page No.: 56 - 60

Molecular Responses of Soybean to Cold Acclimation

Leila Zeinali Yadegari, Reza Heidari and Jirair Carapetian    

Abstract: Low temperature damage is a common problem for early-planted soybean, because it is a tropical plant and is sensitive to low temperatures Soybean (Glycine max cv. Williams) is a tropical crop, but is also grown in temperate regions in middle spring to late summer. This crop has an important role in human diet. Cold temperature damage is a common problem for this plant in temperate regions. Physiological responses to chilling, including, Malondialdehyde (MDA), total protein, Relative Water Content (RWC) and soluble sugar contents were investigated in soybean to identify mechanisms of chilling tolerance. Seedlings were exposed to 15C (cold-acclimated) or 25C (nonacclimated) for 24 h, under 250 mol/m2/sec Photosyntetically Active Radiation (PAR). Then, all plants were exposed to chilling temperature at 4C for 24 h and allowed to recover at 25C for 24 h. Relative water content, MDA and total protein contents showed that cold-acclimated plants were less affected by chilling compared to nonacclimated plants. Cold-acclimated plants also recovered faster from chilling injury than nonacclimated plants.

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