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The Rice Circadian Clock Regulates Tiller Growth and Panicle Development Through Strigolactone Signaling and Sugar Sensing

Fang Wang, Tongwen Han, Qingxin Song, Wenxue Ye, Xiaoguang Song, Jinfang Chu, Jiayang Li, Z. Jeffrey Chen
Fang Wang
aState Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing 210095, China
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Tongwen Han
aState Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing 210095, China
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Qingxin Song
aState Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing 210095, China
bDepartment of Molecular Biosciences, The University of Texas at Austin, Austin, Texas 78712
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Wenxue Ye
aState Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing 210095, China
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Xiaoguang Song
cState Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100049, China
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Jinfang Chu
cState Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100049, China
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Jiayang Li
cState Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100049, China
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Z. Jeffrey Chen
aState Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing 210095, China
bDepartment of Molecular Biosciences, The University of Texas at Austin, Austin, Texas 78712
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  • For correspondence: zjchen@austin.utexas.edu

Published October 2020. DOI: https://doi.org/10.1105/tpc.20.00289

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  • © 2020 American Society of Plant Biologists. All rights reserved.

Abstract

Circadian clocks regulate growth and development in plants and animals, but the role of circadian regulation in crop production is poorly understood. Rice (Oryza sativa) grain yield is largely determined by tillering, which is mediated by physiological and genetic factors. Here we report a regulatory loop that involves the circadian clock, sugar, and strigolactone (SL) pathway to regulate rice tiller-bud and panicle development. Rice CIRCADIAN CLOCK ASSOCIATED1 (OsCCA1) positively regulates expression of TEOSINTE BRANCHED1 (OsTB1, also known as FC1), DWARF14 (D14), and IDEAL PLANT ARCHITECTURE1 (IPA1, also known as OsSPL14) to repress tiller-bud outgrowth. Downregulating and overexpressing OsCCA1 increases and reduces tiller numbers, respectively, whereas manipulating PSEUDORESPONSE REGULATOR1 (OsPPR1) expression results in the opposite effects. OsCCA1 also regulates IPA1 expression to mediate panicle and grain development. Genetic analyses using double mutants and overexpression in the mutants show that OsTB1, D14, and IPA1 act downstream of OsCCA1. Sugars repress OsCCA1 expression in roots and tiller buds to promote tiller-bud outgrowth. The circadian clock integrates sugar responses and the SL pathway to regulate tiller and panicle development, providing insights into improving plant architecture and yield in rice and other cereal crops.

  • Received April 14, 2020.
  • Revised July 20, 2020.
  • Accepted August 12, 2020.
  • Published August 13, 2020.
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The Rice Circadian Clock Regulates Tiller Growth and Panicle Development Through Strigolactone Signaling and Sugar Sensing
Fang Wang, Tongwen Han, Qingxin Song, Wenxue Ye, Xiaoguang Song, Jinfang Chu, Jiayang Li, Z. Jeffrey Chen
The Plant Cell Oct 2020, 32 (10) 3124-3138; DOI: 10.1105/tpc.20.00289

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The Rice Circadian Clock Regulates Tiller Growth and Panicle Development Through Strigolactone Signaling and Sugar Sensing
Fang Wang, Tongwen Han, Qingxin Song, Wenxue Ye, Xiaoguang Song, Jinfang Chu, Jiayang Li, Z. Jeffrey Chen
The Plant Cell Oct 2020, 32 (10) 3124-3138; DOI: 10.1105/tpc.20.00289
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  • First author profile: Fang Wang
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The Plant Cell: 32 (10)
The Plant Cell
Vol. 32, Issue 10
Oct 2020
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