Table 1 Correlations between indicators of symbiotic performance on wild and cultivated soybean populations upon inoculations with S. (E.) fredii CCBAU45436 or B. diazoefficiens sp. nov. USDA110

From: Improvement in nitrogen fixation capacity could be part of the domestication process in soybean

Treatment	Trait 1	Trait 2	Correlation coefficient	P-value
Wild soybean with S. (E.) fredii (CCBAU45436)	^aTotal nitrogen vs	Nodule number	0.230	0.374
		Total nodule fresh weight	0.751	0.001
		Total plant fresh weight	0.925	<0.001
		Total plant dry weight	0.893	<0.001
		Total root fresh weight	0.857	<0.001
	^bTotal ureides vs	Nodule number	−0.348	0.171
		Total nodule fresh weight	0.414	0.098
		Total plant fresh weight	0.404	0.107
		Total plant dry weight	0.306	0.232
		Total root fresh weight	0.483	0.050
Wild soybean with B. diazoefficiens sp. nov. (USDA110)	^aTotal nitrogen vs	Nodule number	0.702	0.002
		Total nodule fresh weight	0.926	<0.001
		Total plant fresh weight	0.979	<0.001
		Total plant dry weight	0.938	<0.001
		Total root fresh weight	0.939	<0.001
	^bTotal ureides vs	Nodule number	0.564	0.018
		Total nodule fresh weight	0.855	<0.001
		Total plant fresh weight	0.885	<0.001
		Total plant dry weight	0.836	<0.001
		Total root fresh weight	0.836	<0.001
Cultivated soybean with S (E). fredii (CCBAU45436)	^aTotal nitrogen vs	Nodule number	0.419	0.019
		Total nodule fresh weight	0.446	<0.001
		Total plant fresh weight	0.779	<0.001
		Total plant dry weight	0.754	<0.001
		Total root fresh weight	0.597	<0.001
	^bTotal ureides vs	Nodule number	0.396	0.027
		Total nodule fresh weight	0.483	0.006
		Total plant fresh weight	0.319	0.080
		Total plant dry weight	0.377	0.037
		Total root fresh weight	0.169	0.364
Cultivated soybean with B. diazoefficiens sp. nov. (USDA110)	^aTotal nitrogen vs	Nodule number	0.383	0.033
		Total nodule fresh weight	0.726	<0.001
		Total plant fresh weight	0.850	<0.001
		Total plant dry weight	0.871	<0.001
		Total root fresh weight	0.517	0.003
	^bTotal ureides vs	Nodule number	0.424	0.017
		Total nodule fresh weight	0.453	0.010
		Total plant fresh weight	0.315	0.084
		Total plant dry weight	0.248	0.179
		Total root fresh weight	0.053	0.776

Correlations analyses were performed on 17 wild and 31 cultivated soybean accessions using the average value per line from 2 replicates of 8–9 plants each. Correlation is significant at the P<0.05 level.
^aPearson's correlation.
^bSpearman's rho non-parametric correlation.

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Table 1 Correlations between indicators of symbiotic performance on wild and cultivated soybean populations upon inoculations with S. (E.) fredii CCBAU45436 or B. diazoefficiens sp. nov. USDA110

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