Studies on the characteristics of phosphorus efficiency of native soybean ( Glycine max (L.) Merrill) germplasm Differences in characteristics of phosphorus efficiency of shoot and root among soybean genotypes and correlation analysis

Studies on the characteristics of phosphorus efficiency of shoot and root among Guangdong's native soybean ( Glycine max (L.) Merrill) genotypes and the correlation between them and plant were conducted by means of soil pots. The main results were as follows: (1) Compared with adequate phosphorus treatment, there was a relatively greater proportion of root dry biomass to plant dry biomass under low phosphorus treatment. In other words, the ratio of root/shoot was relatively higher under low phosphorus treatment. (2) The shoot part of a great many of soybean genotype plants accumulates more percentage phosphorus under low phosphorus treatment. The higher RVPPER value was, the greater shoot phosphorus uptake (SPU) was, and vice versa. In addition, there were differences between shoot and root in characteristics of phosphorus accumulation. (3) With increase from HND55 to HND58 in RVPPER value, there was a tendency for soybean genotypes to show a gradual increase in SPER and RPER under low phosphorus treatment with the exception of HND39. Also, RPER was greater than SPER under low phosphorus treatment, except for HND08,33,39,57,93,94. (4) Shoot phosphorus uptake (SPU) under low phosphorus treatment can be used as an optimal index explaining characteristics of plant phosphorus efficiency in soybean breeding program.