Table 3.

Estimated Ka/Ks ratios of the duplicated BrPDI genes with their divergence time in Chinese cabbage

Duplicated gene pairs			Ks	Ka	Ka/Ks	Duplication type	Types of selection	Time (mya)
BrPDI1–1	vs.	BrPDI1–2	0.0569	0.1138	2.0000	Segmental	Positive	1.89
BrPDI1–1	vs.	BrPDI1–3	0.1064	0.0726	0.6823	Segmental	Purifying	3.54
BrPDI1–2	vs.	BrPDI1–3	0.1113	0.0715	0.6424	Segmental	Purifying	3.71
BrPDI1–4	vs.	BrPDI1–5	0.2421	0.0349	1.4415	Segmental	Positive	8.07
BrPDI2–2	vs.	BrPDI2–3	0.0486	0.1554	3.1975	Segmental	Positive	1.62
BrPDI3–1	vs.	BrPDI3–2	0.1203	0.0698	0.5802	Segmental	Purifying	4.01
BrPDI4–1	vs.	BrPDI4–2	0.1093	0.1515	1.3860	Segmental	Positive	3.64
BrPDI5–1	vs.	BrPDI5–2	0.1010	0.4750	4.7029	Segmental	Positive	3.37
BrPDI8–1	vs.	BrPDI8–2	0.1773	0.0527	0.2972	Segmental	Purifying	5.91
BrPDI8–3	vs.	BrPDI8–4	0.1179	0.0343	0.2909	Segmental	Purifying	3.93
BrPDI8–5	vs.	BrPDI8–6	0.8922	0.3621	0.4058	Segmental	Purifying	29.74
BrPDI10–1	vs.	BrPDI10–2	0.2892	0.1337	0.4623	Segmental	Purifying	9.64
BrPDI10–1	vs.	BrPDI10–3	0.4183	0.2768	0.6613	Segmental	Purifying	13.94
BrPDI10–2	vs.	BrPDI10–3	0.7166	0.2026	0.2827	Segmental	Purifying	23.89
BrPDI11–1	vs.	BrPDI11–2	0.0895	0.1179	1.3173	Segmental	Positive	2.98
BrPDI11–1	vs.	BrPDI11–4	0.0969	0.2040	2.1052	Segmental	Positive	3.23
BrPDI11–2	vs.	BrPDI11–4	0.0985	0.3570	3.6243	Segmental	Positive	3.28

Ks the number of synonymous substitutions per synonymous site, Ka the number of nonsynonymous substitutions per nonsynonymous site, MYA million years ago