Dynamic Accumulation of Fatty Acids in Grain Maturing Process of Soybean

Six soybean cultivars differing in quality characters were used to investigate the changes of grain fatty acids.The results showed that during the maturing of soybean seeds,the contents of palmitic acid and linolenic acid declined,whereas the contents of stearic acid,oleic acid and linoleic acid increased.The trend of high-protein content soybean cultivars was different from that of ordinary-protein content cultivars and high-oil soybean cultivars in middle and later periods in palmitic acid accumulation process.The oleic acid accumulation process of Hongfeng 9 was different from that of the other five cultivars significantly.The accumulation of oleic acid was mainly in the early maturing stage of soybean seeds while that of linoleic acid was mainly in the middle or later maturing stage of soybean seeds.Fifty-one days after flowering was the common turning point in the content changes of the five fatty acids during grain maturing of soybean.