Fig. 1

Soybean phenotypic features under each treatment. Soybean seedlings were treated at V2 growth stage, which represented second vegetative stage of the soybean’s development and typically occurred when the soybean plant has developed two fully expanded trifoliate leaves. Growth status of two soybean germplasms (A) was photographed after fourteen days, relative growth rate of shoot (B), root length (C), shoot biomass (D) and root biomass (E) were measured after the same period. Different letters above columns of the different color indicate statistic significant difference at P < 0.05 (Duncan’ s multiple range test). The * (P < 0.05) and ** (P < 0.01) indicate significant differences between bars of the same color (Student’s t-test). CK represents control, LP represents low phosphorus, S represents salt and LPS represents low phosphorus + salt