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Table 2 Ka/Ks analysis and duplicated date calculation for OsCPs and OsVPEs

From: Papain-like and legumain-like proteases in rice: genome-wide identification, comprehensive gene feature characterization and expression analysis

Duplicated pair

Duplicate type

Ka

Ks

Ka/Ks

Positive selection

Date of gene duplication (million years)

OsCP4/OsCP5

Segmental

0.1812

0.1854

0.9773

No

14.26

OsCP8/OsCP31

Segmental

0.5674

0.7307

0.7765

No

56.21

OsCP20/OCP30

Segmental

0.1456

0.5487

0.2654

No

42.21

OsCP1/OsCP2

Tandem

0.3532

0.1727

2.0452

Yes

13.28

OsCP14/OsCP25

Tandem

0.3036

0.2298

1.3211

Yes

17.68

OsCP16/OsCP19

Tandem

0.3724

0.3459

1.0766

Yes

26.61

OsCP15/OsCP27

Tandem

0.3776

0.3423

1.1031

Yes

26.33

OsCP26/OsCP31

Tandem

0.4620

0.3929

1.1759

Yes

30.22

OsCP26/OsCP32

Tandem

0.3422

0.6900

0.4959

No

53.08

OsCP31/OsCP32

Tandem

0.2273

0.4190

0.5425

No

32.23

OsVPE2/OsVPE3

Segmental

0.1482

0.9313

0.1591

No

71.64

  1. Ka/Ks < 1 means negative selection, Ka/Ks = 1 means neutral selection, and Ka/Ks > 1 means positive selection