Fig. 2

Phylogenetic relationship, conserved motifs and gene structure of the ST genes and their corresponding proteins in S. japonica. a: Phylogenetic tree of the 44 S. japonica ST proteins. The maximum likelihood phylogenetic tree was constructed using MEGA 7.0.26, with 1000 bootstrap replications, WAG+F + G method, Gamma 4, partial deletion and 50% site coverage as the cutoff. b: Conserved motifs identified in the 44 ST proteins. Twenty putative motifs were indicated by boxes of different color. Details on the motifs are listed in Additional file 3: Table S3. c: Structures of the ST genes. Exons, introns and UTRs are indicated by green boxes, black lines and yellow boxes, respectively