TABLE 4.

Test of the null hypothesis of linkage equilibrium among 91 multilocus STs in a global collection of 231 Medicago-nodulating rhizobial strains^a

ST(s) included	No. of STs	Genetic diversity	Mismatch variation		Standardized Ia	Monte Carlo P value	Reject null hypothesis?
			Observed	Expected
All	91	0.59 ± 0.04	7.62	2.24	0.26	0.010	Yes
Group 1b	55	0.33 ± 0.07	1.43	1.71	−0.02	0.918	No
Groups 5 and 3b	16	0.35 ± 0.09	1.65	1.42	0.02	0.224	No

^aGroups were partitioned on the basis of the results in Fig. 1 and 2 and also on the basis of the corresponding MLEE data of Eardly and van Berkum (9). I_a, index of association.

^bPlus associated singletons.