Fig. 4

Phylogenetic relationship among TabZIP, TubZIP, AetbZIP, AtbZIP and OsbZIP proteins. The phylogenetic tree was based on the sequence alignment of the bZIP proteins. The unrooted tree was generated using ClustalX 2.1 program and displayed by MEGA 5.0. TabZIP, TubZIP and AetbZIP proteins were mainly classified into 10 subgroups (a, b, c, d, e, f, g, h, i and s) and 4 clades based on our phylogenetic analysis and Jakoby’s classification method of Arabidopsis bZIP family. With the newly identified bZIP members, S subgroup were divided into two clades S1 and S2 by the members in C subgroup and the E subgroup seprated protein members in the I subgroup into two clades I1 and I2. U1-U4 were 4 unnamed clades for lack of grouped AtbZIPs