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Table 2 Gene duplication, Ka/Ks and divergence times of gene duplicated BURP gene pairs in three cotton species

From: Genome-wide identification and expression analysis of the BURP domain-containing genes in Gossypium hirsutum

Duplication gene 1

Duplication gene 2

Identity

Duplicate type

Ks

Ka

Ka/Ks

Purifying selection

Age/MYA

GaBURP3

GaBURP4

94.55

tandem

0.0424

0.0239

0.5764

Yes

8.15

GrPG3

GrPG2

80.84

segment

0.6863

0.1050

0.1530

Yes

263.96

GrRD1

GrRD2

96.12

tandem

0.0498

0.0205

0.4116

Yes

19.15

GhPG2

GhPG1

96.76

segment

0.0615

0.0142

0.2309

Yes

23.65

GhPG4

GhPG3

98.89

segment

0.0325

0.0049

0.1508

Yes

12.50

GhPG5

GhPG6

97.4

segment

0.0260

0.0113

0.4346

Yes

10.00

GhBUPR2

GhBUPR1

97.44

segment

0.0684

0.0111

0.1623

Yes

26.31

GhBUPR11

GhBUPR10

94.65

segment

0.0424

0.0235

0.5542

Yes

16.31

GhBUPR4

GhBUPR3

96.23

segment

0.0353

0.0184

0.5212

Yes

13.58

GhBUPR7

GhBUPR6

95.91

segment

0.0443

0.0188

0.4244

Yes

17.04

GhBNM5

GhBNM6

94.65

segment

0.0683

0.0295

0.4319

Yes

26.27

GhBNM7

GhBNM8

96.03

segment

0.0414

0.0173

0.4179

Yes

15.92

GhBNM2

GhBNM1

97.51

segment

0.0147

0.0126

0.8571

Yes

5.65

GhRD1

GhRD3

92.84

tandem

0.0591

0.0326

0.5516

Yes

22.73

GhRD2

GhRD4

95.82

tandem

0.0542

0.0218

0.4022

Yes

20.85

  1. Ka nonsynonymous substitution rate, Ks synonymous substitution rate, MYA million years ago