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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