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An Aux/IAA Family Member, RhIAA14, Involved in Ethylene-Inhibited Petal Expansion in Rose (Rosa hybrida)

文献类型： 外文期刊

作者： Jia, Yangchao 1 ; Chen, Changxi 1 ; Gong, Feifei 1 ; Jin, Weichan 1 ; Zhang, Hao 2 ; Qu, Suping 2 ; Ma, Nan 1 ; Jiang, Yunhe 1 ; Gao, Junping 1 ; Sun, Xiaoming 1 ;

作者机构： 1.China Agr Univ, Beijing Key Lab Dev & Qual Control Ornamental Cro, Coll Hort, Beijing 100193, Peoples R China

2.Yunnan Acad Agr Sci, Flower Res Inst, Kunming 650205, Yunnan, Peoples R China

关键词： rose; flower opening; petal expansion; ethylene; Aux; IAA

期刊名称：GENES （ 影响因子：4.141； 五年影响因子：4.474 ）

ISSN：

年卷期： 2022 年 13 卷 6 期

页码：

收录情况： SCI

摘要： Flower size, a primary agronomic trait in breeding of ornamental plants, is largely determined by petal expansion. Generally, ethylene acts as an inhibitor of petal expansion, but its effect is restricted by unknown developmental cues. In this study, we found that the critical node of ethylene-inhibited petal expansion is between stages 1 and 2 of rose flower opening. To uncover the underlying regulatory mechanism, we carried out a comparative RNA-seq analysis. Differentially expressed genes (DEGs) involved in auxin-signaling pathways were enriched. Therefore, we identified an auxin/indole-3-acetic acid (Aux/IAA) family gene, RhIAA14, whose expression was development-specifically repressed by ethylene. The silencing of RhIAA14 reduced cell expansion, resulting in diminished petal expansion and flower size. In addition, the expressions of cell-expansion-related genes, including RhXTH6, RhCesA2, RhPIP2;1, and RhEXPA8, were significantly downregulated following RhIAA14 silencing. Our results reveal an Aux/IAA that serves as a key player in orchestrating petal expansion and ultimately contributes to flower size, which provides new insights into ethylene-modulated flower opening and the function of the Aux/IAA transcription regulator.

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