Table 2.

Omega Values (d_N/d_S) for the Different Gene Classes in the Chloroplast Genomes of Ulvophycean Algae

	Single-ω model	Two-ω model		ΔAIC
	ω global	ω background	ω Ostreobium
Photosynthetic light reactions
atp	0.025	0.028	0.009	25.043
pet	0.032	0.034	0.016	3.625
psa	0.019	0.021	0.007	29.851
psb	0.029	0.031	0.013	40.538
Photosynthetic dark reactions
chl	0.022	0.024	0.012	4.749
ccsA	0.025	0.025	0.032	−1.938
rbcL	0.020	0.023	0.007	13.922
Translation and protein-modifying enzymes
clp	0.014	0.017	0.004	2.825
infA	0.039	0.044	0.020	0.660
rpl	0.039	0.040	0.029	−0.643
rps	0.035	0.036	0.022	1.179
tufA	0.023	0.025	0.011	1.516
Proteins not related to photosynthesis
accD	0.036	0.041	0.017	1.379
cys	0.027	0.027	6.291	−2.000
rpo	0.003	0.003	0.002	−1.749

Note.—Two models were tested a single ω for all lineages and a model with different ω values for Ostreobium and all other species. The goodness of fit of the two-ω over the single-ω model is given by ΔAIC.