TABLE 2.

Fst and Nm values between each pair of species

Species	Valuea
	S. fredii	Sinorhizobium sp.		S. sojae
		I	III
Housekeeping genes
S. fredii		0.2	0.08	0.02
Sinorhizobium sp. I	0.09399d		0.11	0.03
Sinorhizobium sp. III	0.25514d	0.34535d		0.02
S. sojae	0.36543d	0.76201d	0.66570d
Symbiosis-related genes on chromosome
S. fredii		0.03	0.06	0.02
Sinorhizobium sp. I	0.13499d		0.03	0.00
Sinorhizobium sp. III	0.26549d	0.41043b		0.01
S. sojae	0.36791d	0.79999c	0.65599c
Symbiosis-related genes on pSymB
S. fredii		0.07	0.07	0.03
Sinorhizobium sp. I	0.11360d		0.00	0.00
Sinorhizobium sp. III	0.27607d	0.74659b		0.00
S. sojae	0.34241d	1.00000d	0.88609c
Symbiosis-related genes on pSymA
S. fredii		0.28	1.98	4.61
Sinorhizobium sp. I	0.14813d		0.73	0.00
Sinorhizobium sp. III	0.13724d	0.13835b		0.59
S. sojae	−0.01323e	1.00000d	0.34374c

^aThe numbers are Nm values in the upper triangles and Fst in the lower triangles.

^b0.01 < P < 0.05.

^c0.001 < P < 0.01.

^d0.0001 < P < 0.01.

^eNonsignificant.