Table 1.

Detection of positive selection of TaPRX-2A and other 12 homologous PRX genes in plants

Models	np	Estimates of parameters	lnL	LRT pairs	df	2∆lnL	P
M0: one ratio	1	ω = 0.12224	− 5255.0007	M0 /M2	3	249.899394	< 0.005
M1a: neutral	2	p0 = 0.74332, (p1 = 0.25668), ω0 = 0.06658, (ω1 = 1.00)	− 5164.268639
M2a: selection	4	p0 = 0.41411, p1 = 0.29296, (p2 = 0.29293), ω0 = 0.02081, (ω1 = 1.00), ω2 = 0.14800	− 5130.051003	M1/M2	2	68.435272	< 0.005
M7: beta	2	p = 0.53605, q = 2.52403	− 5119.765697	M7/M8	2	7.47398	< 0.025
M8: beta and ω	4	p0 = 0.66950, (p1 = 0.33050), P = 0.29052, q = 0.92947, ω = 0.09129	− 5116.028707

Abbreviation, np Number of free parameters; lnL Log likelihood; LRT Likelihood ratio test; df Degrees of freedom; 2ΔlnL Twice the log-likelihood difference of the models compared