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Table 2 Estimated age of the duplication events for PtSPL paralogous genes

From: Molecular characterization of the SPL gene family in Populus trichocarpa

Paralogous genes

Ks

Estimated time (mya)

PtSPL19(Chr1)/PtSPL11(Chr3)

0.16

9

PtSPL21(Chr2)/PtSPL26(Chr14)

0.31

17

PtSPL8(Chr2)/PtSPL27(Chr14)

0.29

16

PtSPL2(Chr2)/PtSPL9(Chr5)

0.27

15

PtSPL12(Chr8)/PtSPL13(Chr10)

0.24

13

PtSPL5(Chr8) /PtSPL1(Chr10)

0.22

12

PtSPL18(Chr1)/PtSPL22(Chr3)

0.17

9

PtSPL23(Chr 4)/PtSPL16(Chr11)

0.22

12

PtSPL20(Chr1)/PtSPL25(Chr11)

0.39

21

PtSPL7 (Chr2)/ PtSPL6 (Chr14)

0.25

13

PtSPL15(Chr12)/PtSPL14(Chr15)

0.30

16