Fig. 1.

Phylogenetic relationship of Arabidopsis(AtZHD), rice(OsZHD), potato (St, Solanum tuberosum is used instead of PGSC0003DMT4000), tobacco (Nt, Nicotiana tabacum is used instead of XP_0164), Chinese cabbage (BraZF-HD), Selaginella moellendorffii, (SmZF-HD) and tomato (SlZHD) ZHD genes. The conserved ZF-HD_ dimer domain sequences of Arabidopsis, rice, potato, tobacco, Chinese cabbage, Selaginella moellendorffii, and tomato genes were aligned using ClustalX, and the tree were constructed by the neighbor-joining (NJ) method with MEGA 6.0. The numbers on the branches indicate bootstrap support values from 1000 replications. The protein sequences used in the phylogenetic analysis are listed in Additional file 4, along with their accession numbers. The tree was divided into six subfamilies according to bootstrap support values and evolutionary distances