Factors Affecting Water Permeability of Aleurone Layer in Soybean Seeds

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The effect of the immersion condition of soybean seeds on the water permeability in aleurone layer was investigated to clarify the water permeability at the initial stage of water sorption. The amounts of water absorbed in seeds coated with only aleurone layer (embryos uncovered with seed coat) and untreated seeds (embryos covered with seed coat and aleurone layer; intact seeds) were compared under several conditions of temperature, pH, ion species, and salt concentration. The relative weight in both types of seeds increased with the rise of soaking temperature, but it decreased after 180min at 50℃. Whereas both water uptakes were inclined to be little affected by soaking pH, the remarkable increase in the water uptake of seeds coated with only aleurone layer was observed only by soaking in sodium acetate buffer (pH 4.0). Although a lower concentration of KCl (0.01M) stimulated both water uptakes compared with water, a higher concentration of KCl (0.1M and 0.2M) depressed inversely them. The rates of water uptake in both types of seeds changed depending upon ionic strength rather than ion species. From these results, it was found that the state of water sorption in soybean seeds having the aleurone layer scarcely changed even if the seed coat was removed. It is suggested that the water permeability of soybean seeds is mainly due to the characteristics of aleurone layer.
武庫川女子大学の論文