首页|Natural variation in MORE GRAINS 1 regulates grain number and grain weight in rice∞

Natural variation in MORE GRAINS 1 regulates grain number and grain weight in rice∞

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Grain yield is determined mainly by grain number and grain weight.In this study,we identified and characterized MORE GRAINS1(MOG1),a gene associated with grain number and grain weight in rice(Oryza sativa L.),through map-based cloning.Overexpression of MOG1 increased grain yield by 18.6%-22.3%under field conditions.We de-termined that MOG1,a bHLH transcription factor,interacts with OsbHLH107 and directly activates the expression of LONELY GUY(LOG),which encodes a cytokinin-activating enzyme and the cell expansion gene EXPANSIN-LIKE1(EXPLA1),positively regu-lating grain number per panicle and grain weight.Natural variations in the promoter and coding re-gions of MOG1 between Hap-LNW and Hap-HNW alleles resulted in changes in MOG1 expression level and transcriptional activation,leading to functional differences.Haplotype analysis revealed that Hap-HNW,which results in a greater number and heavier grains,has undergone strong selection but has been poorly utilized in modem lowland rice breeding.In summary,the MOG1-OsbHLH107 complex acti-vates LOG and EXPLA1 expression to promote cell expansion and division of young panicles through the cytokinin pathway,thereby increasing grain number and grain weight.These findings suggest that Hap-HNW could be used in strategies to breed high-yielding temperate japonica lowland rice.

grain numbergrain weightMOG1natural variationrice

Yingchun Han、Qianfeng Hu、Nuo Gong、Huimin Yan、Najeeb Ullah Khan、Yanxiu Du、Hongzheng Sun、Quanzhi Zhao、Wanxi Peng、Zichao Li、Zhanying Zhang、Junzhou Li

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Henan Key Laboratory of Rice Molecular Breeding and High Efficiency Production,College of Agronomy,Henan Agricultural University,Zhengzhou 450046,China

Beijing Key Laboratory of Crop Genetic Improvement,College of Agronomy and Biotechnology,China Agricultural University,Beijing 100193,China

Rice Industrial Technology Research Institute,Guizhou University,Guiyang 550025,China

School of Forestry,Henan Agricultural University,Zhengzhou 450046,China

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STI2030 Major ProjectsAgroST ProjectNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaModern Agricultural Industry Technology System Projects of Henan,ChinaKey R&D projects of HenanKey Laboratory of Functional Agriculture,Guizhou ProvinceKey Laboratory of Molecular Breeding for Grain and Oil crops,Guizhou ProvinceChina Postdoctoral Science Foundation

2023ZD0406803NK2022050103323720943227212332072036HARS-22-03-G3231111110500[2023]007[2023]0082021M701108

2024

植物学报(英文版)
中国植物学会

植物学报(英文版)

CSTPCD
影响因子:0.921
ISSN:1672-9072
年,卷(期):2024.66(7)
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