A Role for a Dioxygenase in Auxin Metabolism and Reproductive Development in Rice

文献类型： 外文期刊

第一作者： Zhao, Zhigang

作者： Zhao, Zhigang;Zhang, Yunhui;Liu, Xi;Yu, Xiaowen;Ren, Yulong;Zhou, Kunneng;Jiang, Ling;Wan, Jianmin;Zhang, Xin;Zheng, Xiaomin;Guo, Xiuping;Wu, Chuanyin;Zhai, Huqu;Wang, Haiyang;Wan, Jianmin;Liu, Shichang;Gai, Ying;Wang, Haiyang

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期刊名称：DEVELOPMENTAL CELL （ 影响因子：12.27； 五年影响因子：12.332 ）

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收录情况： SCI

摘要： Indole-3-acetic acid (IAA), the natural auxin in plants, regulates many aspects of plant growth and development. Extensive analyses have elucidated the components of auxin biosynthesis, transport, and signaling, but the physiological roles and molecular mechanisms of auxin degradation remain elusive. Here, we demonstrate that the dioxygenase for auxin oxidation (DAO) gene, encoding a putative 2-oxoglutarate-dependent-Fe (II) dioxygenase, is essential for anther dehiscence, pollen fertility, and seed initiation in rice. Rice mutant lines lacking a functional DAO display increased levels of free IAA in anthers andovaries. Furthermore, exogenous application of IAA or overexpression of the auxin biosynthesis gene OsYUCCA1 phenocopies the dao mutants. We show that recombinant DAO converts the active IAA into biologically inactive 2-oxoindole-3-acetic acid (OxIAA) invitro. Collectively, these data support a key role of DAO in auxin catabolism and maintenance of auxin homeostasis central to plant reproductive development.

分类号： Q2

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