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Table 3 Estimates of the dates for the large scale duplication events in poplar

From: Comparative genomic analysis of the WRKY III gene family in populus, grape, arabidopsis and rice

Duplicated Hsf gene pairs

Number of conserved flanking protein-coding genes

Ka/Ks (mean ± s.d.)

Ks (mean ± s.d.)

Date (mya)

PtrWRKY41/53

21

0.2956 ± 0.1619

0.2958 ± 0.0823

16.2512

PtrWRKY62/89

18

0.2260 ± 0.1143

0.3045 ± 0.0941

16.7297

PtrWRKY64/63

15

0.3577 ± 0.1307

0.2857 ± 0.0777

15.6974

PtrWRKY64/53

7

0.2751 ± 0.1394

1.0270 ± 0.6001

56.4264

PtrWRKY63/53

6

0.2071 ± 0.1755

1.1829 ± 0.7230

64.9923

PtrWRKY41/64

5

0.2130 ± 0.1245

1.2803 ± 0.3083

70.3443

PtrWRKY41/63

5

0.2540 ± 0.0519

1.2109 ± 0.0761

66.5330

PtrWRKY90/55

5

0.3287 ± 0.0633

0.2635 ± 0.0936

14.4753