Table 4.

Nonsynonymous (Dn) to synonymous (Ds) substitution rate ratio for plastid gene sequences in the photosynthetic lineages of the subfamily Orchidoideae studied here and in Vietorchis furcata.

Gene names	Dn/Ds ratio in photosynthetic lineages (PAML)	Dn/Ds ratio in Vietorchis furcata (PAML)	LRT p-value (PAML)	LRT p-value (BUSTED)
accD	0.4661	0.3156	0.1492	0.50
clpP	0.0884	0.1678	0.2820	0.50
infA	0.0573	0.1788	0.1716	0.50
matK	0.4562	0.6255	0.2042	0.47
rpl14	0.1144	0.4381	0.0459	0.50
rpl16	0.1938	0.2353	0.7362	0.50
rpl2	0.2622	0.2108	0.7211	0.50
rpl20	0.3854	0.5069	0.5860	0.28
rpl22	0.2649	0.508	0.2601	0.50
rpl23	0.1322	0.8199	0.0368	0.50
rpl32	0.2493	0.5702	0.3551	0.32
rpl36	0.1594	0.3429	0.4964	0.50
rps11	0.1108	0.3899	**0.0103	0.50
rps12	0.1626	0.5786	0.1714	0.50
rps14	0.2570	0.2526	0.9789	0.50
rps16	0.1719	0.2997	0.3906	0.50
rps18	0.1462	0.5851	0.0312	0.50
rps19	0.2742	0.1985	0.7472	0.50
rps2	0.1115	0.4894	**0.0013	0.26
rps3	0.1470	0.3548	0.0347	0.19
rps4	0.2017	0.5588	0.0271	0.50
rps7	0.3321	0.5061	0.6065	0.50
rps8	0.1525	0.3366	0.1044	0.42
ycf1	0.5984	0.5630	0.6778	0.50
ycf2	0.7460	0.6457	0.3707	0.50

** indicates that the differеnce is statistically significant after Bonferroni correction.