Subject Code:C13 Soybean is a major legume crop originating in temperate regions,and photoperiod responsiveness is a key factor in its latitudinal adaptation.Cultivars from temperate regions introduced to lower latitudes mature early and result in extremely low grain yields.Introduction of the long-juvenile(LJ)trait extends the Subject Code: C13 Soybean is a major legume crop originating in temperate regions, and photoperiod responsiveness is a key factor in its latitudinal adaptation. Multivars from temperate regions introduced to lower latitudes mature early and result in extremely low grain yields.Introduction of the long- juvenile (LJ) trait extends the