Hierarchical clustering of the expression profiles of all 45 VviMAPKKK genes in different grapevine developmental stages and tissues. A total of 54 grapevine samples (flower, berry, bud, leaf, rachis, root, seed, seedling, stem, and tendril) covering most organs at several developmental stages were analyzed. Log2-transformed expression values were used to create the heat map. The red or green colors represent the higher or lower relative abundance of each transcript in each sample, compared to the median expression value of that gene in the whole sample set. Genes and organs were clustered (A and B) according to their expression profiles. Developmental stages are abbreviated according to Fasoli et al. .