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Jasmonic acid regulates spikelet development in rice

Author

Listed:
  • Qiang Cai

    (State Key Laboratory of Hybrid Rice, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University)

  • Zheng Yuan

    (State Key Laboratory of Hybrid Rice, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University)

  • Mingjiao Chen

    (State Key Laboratory of Hybrid Rice, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University)

  • Changsong Yin

    (State Key Laboratory of Hybrid Rice, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University)

  • Zhijing Luo

    (State Key Laboratory of Hybrid Rice, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University)

  • Xiangxiang Zhao

    (Jiangsu Key Laboratory for Eco-Agricultural Biotechnology around Hongze Lake, Huaiyin Normal University, Huian)

  • Wanqi Liang

    (State Key Laboratory of Hybrid Rice, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University)

  • Jianping Hu

    (Michigan State University)

  • Dabing Zhang

    (State Key Laboratory of Hybrid Rice, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University)

Abstract

The spikelet is the basal unit of inflorescence in grasses, and its formation is crucial for reproductive success and cereal yield. Here, we report a previously unknown role of the plant hormone jasmonic acid (JA) in determining rice (Oryza sativa) spikelet morphogenesis. The extra glume 1 (eg1) and eg2 mutants exhibit altered spikelet morphology with changed floral organ identity and number, as well as defective floral meristem determinacy. We show that EG1 is a plastid-targeted lipase that participates in JA biosynthesis, and EG2/OsJAZ1 is a JA signalling repressor that interacts with a putative JA receptor, OsCOI1b, to trigger OsJAZ1’s degradation during spikelet development. OsJAZ1 also interacts with OsMYC2, a transcription factor in the JA signalling pathway, and represses OsMYC2’s role in activating OsMADS1, an E-class gene crucial to the spikelet development. This work discovers a key regulatory mechanism of grass spikelet development and suggests that the role of JA in reproduction has diversified during the flowering plant evolution.

Suggested Citation

  • Qiang Cai & Zheng Yuan & Mingjiao Chen & Changsong Yin & Zhijing Luo & Xiangxiang Zhao & Wanqi Liang & Jianping Hu & Dabing Zhang, 2014. "Jasmonic acid regulates spikelet development in rice," Nature Communications, Nature, vol. 5(1), pages 1-13, May.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4476
    DOI: 10.1038/ncomms4476
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    Cited by:

    1. Yueya Zhang & Chaoqun Shen & Gang Li & Jin Shi & Yajing Yuan & Lingzhen Ye & Qingfeng Song & Jianxin Shi & Dabing Zhang, 2024. "MADS1-regulated lemma and awn development benefits barley yield," Nature Communications, Nature, vol. 15(1), pages 1-16, December.
    2. Hehong Zhang & Fengmin Wang & Weiqi Song & Zihang Yang & Lulu Li & Qiang Ma & Xiaoxiang Tan & Zhongyan Wei & Yanjun Li & Junmin Li & Fei Yan & Jianping Chen & Zongtao Sun, 2023. "Different viral effectors suppress hormone-mediated antiviral immunity of rice coordinated by OsNPR1," Nature Communications, Nature, vol. 14(1), pages 1-17, December.

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