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Type: Journal article
Title: Jasmonic acid regulates spikelet development in rice
Author: Cai, Q.
Yuan, Z.
Chen, M.
Yin, C.
Luo, Z.
Zhao, X.
Liang, W.
Hu, J.
Zhang, D.
Citation: Nature Communications, 2014; 5(1):3476-1-3476-13
Publisher: Nature Publishing Group
Issue Date: 2014
ISSN: 2041-1723
Statement of
Qiang Cai, Zheng Yuan, Mingjiao Chen, Changsong Yin, Zhijing Luo, Xiangxiang Zhao, Wanqi Liang, Jianping Hu and Dabing Zhang
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.
Keywords: Oryza sativa
Description: Published 19 March 2014
Rights: © 2014 Macmillan Publishers Limited. All rights reserved.
RMID: 0030023436
DOI: 10.1038/ncomms4476
Appears in Collections:Agriculture, Food and Wine publications

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