Intron and exon organization of G. raimondii MAPK genes ( GrMPKs ). Introns and exons are represented by black lines and colored boxes, respectively. GrMPKs were grouped according to phylogenetic classification. Phylogenetic analysis was done using the ML method with 1,000 resampling replicates. Bootstrap values (%) based on 1000 replicates are indicated beside the nodes.