Accumulation Regulation of Protein Content during Seed Developing of Different Soybeans

Soybean is a very important grain and oil crop,and the protein content is one of main indicators of soybean quality,so study the dynamic accumulation of protein content in soybean seeds is important for quality improvement.This experiment chose twelve popular soybean varieties in Heilongjiang province,including four high-protein,four high-oil and four general varieties,as material,and the dynamic accumulation of protein content among different soybean seeds was investigated.The results showed that the accumulation dynamics of seed protein varied with varieties,the high-protein variety showed a double-peak curve trend,and the peak value appeared 14 days and 28 days after seed filling;the high-oil variety and general variety showed a single-peak curve,and the peak appeared 28 days after seed filling for high-oil variety.The average protein content of different soybean varieties changed obviously in former period of seeds formation,and remain stable in later period.During the later seed formation,high-protein variety had the highest protein content,while high-oil variety had the lowest protein content.The final protein content of different soybean was mainly determined by middle or later period of the seeds formation,Suggesting that we should pay more attention to cultivation practice in later soybean growing stage.