The Gene Structure and Expression Level Changes of the Gene Family in Relative to Its Diploid Ancestors.

The gene family plays a vital role in the phytohormone-related growth and developmental processes. The effects of allopolyploidization on gene structures and expression levels have not been reported. In this study, a total of 38, 25, and 66 genes were identified in (AA), (CC), and (AACC), respectively. genes were unevenly distributed on chromosomes with 39 on A and 27 on C, in which six genes may appear as new genes. The whole genome triplication allowed the gene family to expand in diploid ancestors, and allopolyploidization made the gene family re-expand in . For most genes, the exon-intron compositions were similar to diploid ancestors, while the cis-element distributions were obviously different from its ancestors. After allopolyploidization, the expression patterns of genes from ancestor species changed greatly in , and the orthologous gene pairs between A/A and C/C had diverged expression patterns across four tissues. Our study provides a comprehensive analysis of the gene family in , and these results could contribute to identifying genes with vital roles in phytohormone-related growth and developmental processes.