Fig. 5From: Genome-wide identification of the peptide transporter family in rice and analysis of the PTR expression modulation in two near-isogenic lines with different nitrogen use efficiencyPTR genes nuderwent positive selection. X-axis indicates Ka/Ks ratio. Y-axis indicates PTR paralogous gene pairs. Ka/Ks>1 represents positive selection; Ka/Ks =1 represent neutral selection; Ka/Ks<1, represents purify selectionBack to article page