Conversion between duplicated genes generated by polyploidization contributes to the divergence of poplar and willow

Table 1 Nucleotide substitution rates of quartets in the P. trichocarpa and S. brachista genomes

	Converted genes		Nonconverted genes	P value (T test)
Paralogs in P. trichocarpa	Pn	0.075	0.085	0.587
	Ps	0.220	0.264	0.394
	Pn/Ps	0.380	0.343	0.432
Paralogs in S. brachista	Pn	0.113	0.130	0.577
	Ps	0.314	0.347	0.103
	Pn/Ps	0.336	0.295	0.197
Orthologs between P. trichocarpa and S. brachista	Pn	0.231	0.058	2.02E-46
	Ps	0.461	0.163	1.10E-55
	Pn/Ps	0.523	0.328	3.61E-11

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