To explore the evolutionary characteristics of subgenus Soja plants,we compared anatomical structure differences among leaves of four soybean germplasm from Jilin Province by paraffin section.Results showed that there were significant differences in the anatomical structure of the four taxa of plant leaves within subgenus Soja.In accordance with the order of wild soybean to cultured soybean,the leaves and primary veins thickened,the number of epidermal hairs increased,vessel elements in the primary vein vas...