The roles of Aux/IAA gene family in development of Dendrocalamus sinicus (Poaceae: Bambusoideae) inferred by comprehensive analysis and expression profiling
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Auxin is an important hormone in many plant developmental processes. In this study, the auxin/indole acetic acid (Aux/IAA) gene family was comprehensively identified using Dendrocalamus sinicus transcriptome data. A total of 26 Aux/IAA genes (DsIAA1–DsIAA26) were mined using four conserved Aux/IAA family motifs (PF02309). They encoded hydrophilic proteins, including one or two nuclear localisation signals. The D. sinicus Aux/IAA proteins were classified into two groups, including seven sister-gene pairs based on their phylogenetic relationships. A phylogenetic tree generated by aligning 108 predicted protein sequences of 26 DsIAAs, 43 PhIAAs (Phyllostachys heterocycla), 29 AtIAAs (Arabidopsis), 31 OsIAAs (Oryza sativa) and 22 PtIAAs (Populus) revealed nine major groups. Among them, four groups, including 96 IAA proteins of all five species, suggested that the genes originated before divergence of monocots and dicots. The expression profiling in different tissues showed that most of the DsIAAs preferentially expressed in leaves and shoots, suggesting their important roles in the development of leaves and shoots in D. sinicus. Continuously high expression of DsIAA3, DsIAA4, DsIAA15, and DsIAA20 may be important for regulating shoot development in D. sinicus. These results provide useful information for further research into the function of Aux/IAA genes in woody sympodial bamboos.
KeywordsDendrocalamus sinicus Auxin Aux/IAA gene family Bioinformatics analysis Expression profiling
This research was funded by the Fundamental Research Funds of the Chinese Academy of Forestry (Grant Nos. CAFYBB2017ZX001-8, CAFYBB2017QA014), the National Natural Science Foundation of China (Grant Nos. 31800503; 31870574), Department of Sciences and Technology of Yunnan Province (Grant No. 2014HB041).
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Conflict of interest
The authors declare that they have no competing interests.
Research involving human and animal participants
This article does not contain any studies with human participants or animals performed by any of the authors.
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