Table 1 PERMANOVA testing for the effects of symbiotic groups, plant family, and plant species on community composition. Tests were conducted on Bray-Curtis dissimilarities of bacterial and fungal OTU communities with the primary symbiont OTUs removed. For the term “Symbiotic Group” three different contrasts testing all possible combinations of factor levels of symbiotic groups against each other were performed (a, b, c)

seqDepth

1

2.16

0.001

1.71

seqDepth

11.71

0.001

6.81

Pot

1

4.61

0.001

3.65

Pot

7.70

0.001

4.48

isLupin

1

3.23

0.001

2.56

isLupin

3.21

0.007

1.87

Symbiotic Group

2

4.66

0.001

7.38

Symbiotic Group

11.84

0.001

13.77

a) A vs. others

1

4.07

0.001

3.22

a) A vs. others

5.73

0.001

3.33

a) AR vs. N

1

5.26

0.001

4.16

a) AR vs. N

17.94

0.001

10.43

b) AR vs. others

1

6.68

0.001

5.28

b) AR vs. others

14.35

0.001

8.34

b) A vs. N

1

2.65

0.001

2.1

b) A vs. N

9.33

0.001

5.42

c) N vs. others

1

3.91

0.001

3.09

c) N vs. others

16.54

0.001

9.62

c) AR vs. A

1

5.42

0.001

4.29

c) AR vs. A

7.13

0.001

4.15

Group A families (Poaceae vs. Solanaceae)

1

5.56

0.001

4.4

Group A families (Poaceae vs. Solanaceae)

9.76

0.001

5.67

Group N families (Amaranthaceae vs. Brassicaceae)

1

3.21

0.001

2.54

Group N families (Amaranthaceae vs. Brassicaceae)

17.45

0.001

10.15

Group A plant sp.

4

2.91

0.001

9.22

Group A plant sp.

4.09

0.001

9.51

Group AR plant sp.

4

1.91

0.001

6.03

Group AR plant sp.

1.89

0.006

4.4

Group N plant sp.

3

2.33

0.001

5.53

Group N plant sp.

0.84

0.654

1.47

Residuals

72

56.98

Residuals

41.87