The protein content and sulfer-containing amino acid content of seed protein in 1004 soybean cuhivar were detected.
There were highly significant negative correlation between sulfer-containing amino acid and protein content of soybean seeds. It seems difficult to enhance both protein and sulfer-containing amino acid content. However, the range and c. v of sulfer-containing amino acid content among different cultivars were quite wide (1.08-1.79 g/16 gN, c. v. 7.94% for cystine, 0.93-1.65 g/16 gN, c. v 9.30% for methionine) and screening germplasm resources of high content of sulfer-containing amino acid seems to be possible.
T test of mean of unpaired data illustrated that the contetnts of protein, cystine and methienine were varied becouse of different environment. Methionine content of soybean in high latitude area was higher than that of low latitude area. Conversely, protein and cystine contents in high latitude area were lower than that of low latitude area.