The Rice Circadian Clock Regulates Tiller Growth and Panicle Development Through Strigolactone Signaling and Sugar Sensing
| Autor: | Z. Jeffrey Chen, Jiayang Li, Xiaoguang Song, Fang Wang, Jinfang Chu, Qingxin Song, Wenxue Ye, Tongwen Han |
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| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
0301 basic medicine Mutant Circadian clock Strigolactone Tiller (botany) Plant Science Biology 01 natural sciences In Brief 03 medical and health sciences Lactones Gene Expression Regulation Plant Circadian Clocks Promoter Regions Genetic Panicle Plant Proteins Regulation of gene expression Oryza sativa food and beverages Oryza Cell Biology Plants Genetically Modified Cell biology 030104 developmental biology Mutation Signal transduction Sugars Heterocyclic Compounds 3-Ring 010606 plant biology & botany Signal Transduction |
| Zdroj: | Plant Cell |
| ISSN: | 1532-298X |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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