Table 2.

The correlation of evolutionary rate and gene feature in WRKY orthologs and paralogs

	Fop	Polypeptide length	GC1	GC2	GC3
Ortholog
Ks	0.09026	−0.0958	− 0.10494	− 0.0116	0.0672
Ka	− 0.18988**	− 0.10997	− 0.25635**	− 0.25051**	− 0.06667
Ka/Ks	− 0.18418**	− 0.15026**	−0.23272**	− 0.23049**	−0.0526
Paralog
Ks	0.10751	0.09914	−0.08703	0.03401	−0.10284
Ka	−0.36815**	0.11903	−0.24856	−0.36392**	− 0.37883**
Ka/Ks	−0.58738**	− 0.04473	−0.2972*	− 0.54631**	−0.29905*

Fop frequency of optimal codons, GC1 GC content at first codon positions, GC2 GC content at second codon positions, GC3 GC content at third codon positions, K_s synonymous substitution ratio, K_a nonsynonymous substitution ratio, K_a/K_s nonsynonymous to synonymous substitution ratio

*indicates significance at P < 0.05; **indicates significance at P < 0.01