Table 2.

Estimated divergence period of PtrFLA gene pairs in Populus trichocarpa.

Gene pairs	Ka	Ks	Ka/Ks	MYA
PtrFLA2 vs. PtrFLA12	0.0600	0.2364	0.2539	13.0
PtrFLA3 vs. PtrFLA21	0.0685	0.2571	0.2665	14.1
PtrFLA4 vs. PtrFLA10	0.0845	0.3179	0.2658	17.5
PtrFLA6 vs. PtrFLA26	0.0357	0.2945	0.1211	16.2
PtrFLA7 vs. PtrFLA25	0.0225	0.3196	0.0705	17.5
PtrFLA8 vs. PtrFLA11	0.0263	0.2573	0.1022	14.1
PtrFLA13 vs. PtrFLA23	0.0733	0.3306	0.2216	18.2
PtrFLA14 vs. PtrFLA24	0.0387	0.2409	0.1605	13.2
PtrFLA15 vs. PtrFLA19	0.0276	0.0909	0.3036	5.0
PtrFLA16 vs. PtrFLA30	0.0722	0.3050	0.2369	16.8
PtrFLA17 vs. PtrFLA18	0.0396	0.1197	0.3311	6.6
PtrFLA31 vs. PtrFLA34	0.0428	0.0858	0.4991	4.7