An ACC Oxidase Gene Essential for Cucumber Carpel Development

文献类型： 外文期刊

第一作者： Cui, Qingzhi

作者： Cui, Qingzhi;Sun, Jinjing;Li, Shuai;Zhang, Huimin;Wang, Huaisong;Lin, Tao;Gao, Dongli;Wang, Shenhao;Zhang, Zhonghua;Huang, Sanwen;Zhang, Huimin;Lin, Tao;Gao, Dongli;Huang, Sanwen;Xin, Fengjiao;Li, Xia;Wang, Donghui;Xu, Zhihong

作者机构：

关键词： cucumber;sex determination;carpel development;ACC oxidase

期刊名称：MOLECULAR PLANT （ 影响因子：13.164； 五年影响因子：16.357 ）

ISSN： 1674-2052

年卷期： 2016 年 9 卷 9 期

页码：

收录情况： SCI

摘要： Sex determination in plants gives rise to unisexual flowers that facilitate outcrossing and enhance genetic diversity. In cucumber and melon, ethylene promotes carpel development and arrests stamen development. Five sex-determination genes have been identified, including four encoding 1-aminocyclopropane-1-carboxylate (ACC) synthase that catalyzes the rate-limiting step in ethylene biosynthesis, and a transcription factor gene CmWIP1 that corresponds to the Mendelian locus gynoecious in melon and is a negative regulator of femaleness. ACC oxidase (ACO) converts ACC into ethylene; however, it remains elusive which ACO gene in the cucumber genome is critical for sex determination and how CmWIP1 represses development of female flowers. In this study, we discovered that mutation in an ACO gene, CsACO2, confers androecy in cucumber that bears only male flowers. The mutation disrupts the enzymatic activity of CsACO2, resulting in 50% less ethylene emission from shoot tips. CsACO2 was expressed in the carpel primordia and its expression overlapped with that of CsACS11 in female flowers at key stages for sex determination, presumably providing sufficient ethylene required for proper CsACS2 expression. CmACO3, the ortholog of CsACO2, showed a similar expression pattern in the carpel region, suggesting a conserved function of CsACO2/CmACO3. We demonstrated that CsWIP1, the ortholog of CmWIP1, could directly bind the promoter of CsACO2 and repress its expression. Taken together, we propose a presumably conserved regulatory module consisting of WIP1 transcription factor and ACO controls unisexual flower development in cucumber and melon.

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