Phylogenetic relationship between VvZIP3 and ZIP proteins from Vitis and Arabidopsis thaliana. Phylogenetic analysis was performed using the software MEGA 4.0 (http://www.megasoftware.net/mega.html). It is assumed that the length of the branches is proportional to phylogenetic distances. Position of VvZIP3 in the not rooted tree is marked by a black arrowhead. Grapevine protein sequences were deduced from the nucleotide sequence obtained in this work (VvZIP3) or from the GenBank accessions (see methods).