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Table 2 Tests of positive selection in specific branches

From: Adaptive evolution of the symbiotic gene NORK is not correlated with shifts of rhizobial specificity in the genus Medicago

Branch with free ω

κ

ω 0

ω 1

np

Log-L

LR

P

Test ω1 > 1

None (null model)

2.32

0.37

None

2

-7298.06

   

1 (M. monspeliaca)

2.31

0.37

0.36

3

-7298.06

0.00

> 0.50

-

2 (main group)

2.31

0.37

0.40

3

-7298.06

0.00

> 0.50

-

3 (M. laciniata, sauvagei)

2.31

0.37

0.38

3

-7298.06

0.00

> 0.50

-

4 (M. noeana)

2.32

0.37

1.13

3

-7295.41

5.30*

< 0.05

P > 0.50

5 (M. rigidula)

2.31

0.36

0.00

3

-7295.91

4.30*

< 0.05

-

6 (group a posteriori)

2.32

0.36

1.90

3

-7294.82

6.47*

< 0.05

P > 0.10

  1. Note:
  2. κ: transition/transversion ratio; np: number of free parameters; Log-L: log-likelihood; LR: likelihood ratio; *: P < 0.05; P: P-value.