Fig. 3.

Neighbor-joining phylogenetic tree of Na⁺/H⁺ antiporter protein sequences. Software packages, Clustalx and TreeView, were used to do multiple sequence alignment and generate phylogenetic trees. Bootstrap values (1000 replicates) for this tree are shown as the numbers. The accession numbers of Na⁺/H⁺ antiporters are: KfNHX1 (AY825250), KcNHX1 (DQ304690), SeNHX1 (AY131235), AgNHX1 (AB0384 92), CrNHX1 (AY607026), GhNHX1 (AF515632), PtNHX1 (AY660749), PhNHX1 (AB051817), MsNHX1 (AY513732), BnNHX1 (AA038856), ZmNHX1 (AY 270036) and TaNHX1 (AY040246). Bar=substitutions/site