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Evolution of the Aux/IAA Gene Family in Hexaploid Wheat

文献类型： 外文期刊

作者： Qiao, Linyi 1 ; Zhang, Li; Zhang, Xiaojun 2 ; Zhang, Lei; Li, Xin 2 ; Chang, Jianzhong 2 ; Zhan, Haixian 2 ; Guo, H 1 ;

作者机构： 1.Shanxi Univ, Dept Biol Sci, Coll Life Sci, Taiyuan 030006, Shanxi, Peoples R China

2.Shanxi Acad Agr Sci, Inst Crop Sci, Shanxi Key Lab Crop Genet & Mol Improvement, Taiyuan 030031, Shanxi, Peoples R China

3.Shanxi Acad Agr Sci, Inst Crop Sci, Shanxi Key Lab Crop Genet & Mol Improvement, Taiyu

关键词： Molecular evolution;Aux/IAA gene family;Wheat;Expression analysis

期刊名称：JOURNAL OF MOLECULAR EVOLUTION （ 影响因子：2.395； 五年影响因子：2.282 ）

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收录情况： SCI

摘要： The Aux/IAA (IAA) gene family, involved in the auxin signalling pathway, acts as an important regulator in plant growth and development. In this study, we explored the evolutionary trajectory of the IAA family in common wheat. The results showed ten pairs of paralogs among 34 TaIAA family members. Seven of the pairs might have undergone segmental duplication, and the other three pairs appear to have experienced tandem duplication. Except for TaIAA15-16, these duplication events occurred in the ancestral genomes before the divergence of Triticeae. After that point, two polyploidization events shaped the current TaIAA family consisting of three subgenomic copies. The structure or expression pattern of the TaIAA family begins to differentiate in the hexaploid genome, where TaIAAs in the D genome lost more genes (eight) and protein secondary structures (alpha 1, alpha 3 and beta 5) than did the other two genomes. Expression analysis showed that six members of the TaIAA family were not expressed, and members such as TaIAA8, 15, 16, 28 and 33 exhibited tissue-specific expression patterns. In addition, three of the ten pairs of paralogs (TaIAA5-12, TaIAA15-16 and TaIAA29-30) showed similar expression patterns, and another five paralog pairs displayed differential expression patterns. Phylogenetic analysis showed that paralog pairs with high rates of evolution (omega > omega (0)), particularly TaIAA15-16 and TaIAA29-30, experienced greater motif loss, with only zero to two interacting IAA proteins. In contrast, most paralogous genes with low omega, such as TaIAA5-12, had more complete motifs and higher degrees of interaction with other family members.

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