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Zhao, Zhigang; Zhang, Yunhui; Liu, Xi; Zhang, Xin; Liu, Shichang; Yu, Xiaowen; Ren, Yulong; Zheng, Xiaomin; Zhou, Kunneng; Jiang, Ling; Guo, Xiuping; Gai, Ying; Wu, Chuanyin; Zhai, Huqu; Wang, Haiyang; Wan, Jianmin
Developmental cell, 10/2013, Volume: 27, Issue: 1Journal Article
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 and ovaries. 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) in vitro. Collectively, these data support a key role of DAO in auxin catabolism and maintenance of auxin homeostasis central to plant reproductive development. Display omitted •Rice dao mutants contain increased levels of free IAA in anthers and ovaries•dao mutants are defective in anther dehiscence, pollen grains, and seed development•DAO encodes a 2-oxoglutarate-dependent-Fe (II) dioxygenase•DAO catalyzes the conversion of active IAA into biologically inactive OxIAA Zhao et al. show that the rice gene DAO encodes a dioxygenase conserved in higher plants and essential for catalyzing the conversion of biologically active auxin (IAA) into a biologically inactive form (OxIAA). Loss of DAO function disrupts aspects of reproductive development, including anther dehiscence, pollen fertility, and seed development.
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