Fig. 1

Phylogenetic relationship, gene structure and conserved motif analysis of StHsp20 genes. a Phylogenetic tree of 48 StHsp20 proteins. The unrooted neighbor-joining phylogenetic tree was constructed with MEGA6 using full-length amino acid sequences of 48 StHsp20 proteins, and the bootstrap test replicate was set as 1000 times. b Exon/intron organization of StHsp20 genes. Yellow boxes represent exons and black lines with same length represent introns. The upstream/downstream region of StHsp20 genes are indicated in blue boxes. The numbers of 0, 1, and 2 represent the splicing phase of intron. The length of exons can be inferred by the scale at the bottom. c Distributions of conserved motifs in StHsp20 genes. Ten putative motifs are indicated in different colored boxes. For details of motifs refer to Table 2