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The MdAux/IAA2 Transcription Repressor Regulates Cell and Fruit Size in Apple Fruit

文献类型： 外文期刊

作者： Bu, Haidong 1 ; Sun, Xiaohuan 1 ; Yue, Pengtao 2 ; Qiao, Junling 2 ; Sun, Jiamao 2 ; Wang, Aide 2 ; Yuan, Hui 2 ; Yu, Wenquan 1 ;

作者机构： 1.Heilongjiang Acad Agr Sci, Mudanjiang Branch, Mudanjiang 157000, Peoples R China

2.Shenyang Agr Univ, Coll Hort, Minist Educ,Natl & Local Joint Engn Res Ctr North, Key Lab Fruit Postharvest Biol Liaoning Prov,Key, Shenyang 110866, Peoples R China

关键词： apple; fruit size; auxin; MdAux; IAA2; cell size

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：6.208； 五年影响因子：6.628 ）

ISSN：

年卷期： 2022 年 23 卷 16 期

页码：

收录情况： SCI

摘要： Auxin plays an important role in regulating plant development, and Auxin/indole acetic acid (Aux/IAA) is a type of auxin-responsive gene and plays an important role in auxin signaling; to date, although 29 Aux/IAA proteins have been reported in Abrabidopsis thaliana, only parts of the Aux/IAA family gene functions have been identified. We previously reported that a bud sport of 'Longfeng' (LF) apple (Malus domestica), named 'Grand longfeng' (GLF), which showed a larger fruit size than LF, has lower expression of MdAux/IAA2. In this study, we identified the function of the MdAux/IAA2 gene in apple fruit size difference using Agrobacterium-mediated genetic transformation. Overexpression of MdAux/IAA2 decreased the apple flesh callus increment and caused a smaller globular cell size. In addition, overexpression of MdAux/IAA2 in GLF fruit resulted in the reduction of apple fruit size, weight, and cell size, while silencing MdAux/IAA2 in LF apple fruit resulted in an increase in apple fruit weight and cell size. We suggest that the high auxin content depressed the expression of MdAux/IAA2, and that the downregulated expression of MdAux/IAA2 led to the formation of GLF. Our study suggests a mechanism for fruit size regulation in plants and we will explore the transcription factors functioning in this process in the future.

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