TABLE 3.

Results of AMOVA, showing the effects of cultivar, soil, and single plants on the genetic variability of nodulating S. meliloti populations

Analysisa	Source of variation	November 1994			August 1995			September 1997b
		Variance component	% of total	P value	Variance component	% of total	P value	Variance component	% of total	P value
A	Total population, among cultivars	0.375	9.46	0.13427	0.620	14.93	0.06482	−0.033	−1.14	1.00000
	Soils within cultivar	0.537	13.56	<0.00001	0.353	8.50	<0.00001	0.134	4.55	0.00346
	Plants within cultivar-soil combination	3.049	76.98	<0.00001	3.181	76.57	<0.00001	2.846	96.58	<0.00001
B	Among cultivars	0.761	21.59	<0.00001	1.027	25.69	<0.00001	0.054	1.96	0.19316
	Plants within cultivar	0.182	5.15	<0.00001	0.541	13.52	<0.00001	0.429	15.42	<0.00001
	Nodules within plant	2.584	73.26	<0.00001	2.431	60.79	<0.00001	2.299	82.62	<0.00001
C	Among cultivars	0.834	19.48	<0.00001	0.734	17.08	<0.00001	−0.043	−1.42	0.73560
	Plants within cultivar	0.419	9.78	<0.00001	0.603	14.02	<0.00001	0.592	19.35	<0.00001
	Nodules within plant	3.029	70.73	<0.00001	2.963	68.90	<0.00001	2.512	82.07	<0.00001

^aAnalysis B was performed with sandy loam soil, and analysis C was performed with clay soil. 

^bIn September 1997, the effects were analyzed only for cultivars Lodi and Oneida.