Soybean (Glycine max) expansin gene superfamily origins: segmental and tandem duplication events followed by divergent selection among subfamilies

Table 5 Tests for positive selection among codons of expansin genes using site models

Models	p ^a	Estimates of parameters	InL	2⊿l	Positively selected sites^b
M0	1	ω = 0.133	-14554.8		None
(one-ratio)
M3	5	p₀ = 0.22607 p₁ = 0.55054 p₂ = 0.22339	-14274.8	560(M3 vsM0)	None
(discrete)		ω₁ = 0.02570 ω₂ = 0.11359 ω₃ = 0.33505
M7	2	p = 0.99176 q = 5.71801	-14266.9		Not allowed
(beta)
M8	4	p0 = 0.99999 p = 0.61117 q = 1.88462	-16630.6	4727.4(M8 vsM7)	42G,43T,123H,146S,153R,166S,172L*,
(beta&ɯ)		(p1 = 0.00001) ω = 2.02644			184G,186A,190S,195 M,196P*,198S,203Q

Note: ^aNumber of parameters in the ω distribution.
^bPositive-selection sites are inferred at posterior probabilities > 95% with those reaching 99% shown in bold.
*Sites were also found to be implicated in the functional divergence.

ISSN: 1471-2229