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Control of grain size and rice yield by GL2-mediated brassinosteroid responses
Ronghui Che,Hongning Tong,Bihong Shi,Yuqin Liu,Shanru Fang,Dapu Liu,Yunhua Xiao,Bin Hu,Linchuan Liu,Hongru Wang,Mingfu Zhao & Chengcai Chu
Nature Plants
Abstract
Given the continuously growing population and decreasing arable land, food shortage is becoming one of the most serious global problems in this century 1. Grain size is one of the determining factors for grain yield and thus is a prime target for genetic breeding 2,3. Although a number of quantitative trait loci (QTLs) associated with rice grain size have been identified in the past decade, mechanisms underlying their functions remain largely unknown 4,5. Here we show that a grain-length-associated QTL, GL2, has the potential to improve grain weight and grain yield up to 27.1% and 16.6%, respectively. We also show that GL2 is allelic to OsGRF4 and that it contains mutations in the miR396 targeting sequence. Because of the mutation, GL2 has a moderately increased expression level, which consequently activates brassinosteroid responses by upregulating a large number of brassinosteroid-induced genes to promote grain development. Furthermore, we found that GSK2, the central negative regulator of rice brassinosteroid signalling, directly interacts with OsGRF4 and inhibits its transcription activation activity to mediate the specific regulation of grain length by the hormone. Thus, this work demonstrates the feasibility of modulating specific brassinosteroid responses to improve plant productivity.
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论文编号: |
DOI:10.1038/nplants.2015.195 |
论文题目: |
Control of grain size and rice yield by GL2-mediated brassinosteroid responses |
英文论文题目: |
Control of grain size and rice yield by GL2-mediated brassinosteroid responses |
第一作者: |
Ronghui Che,Hongning Tong,Bihong Shi,Yuqin Liu,Shanru Fang,Dapu Liu,Yunhua Xiao,Bin Hu,Linchuan Liu,Hongru Wang,Mingfu Zhao & Chengcai Chu |
英文第一作者: |
Ronghui Che,Hongning Tong,Bihong Shi,Yuqin Liu,Shanru Fang,Dapu Liu,Yunhua Xiao,Bin Hu,Linchuan Liu,Hongru Wang,Mingfu Zhao & Chengcai Chu |
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2015-12-22 |
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摘要: |
Given the continuously growing population and decreasing arable land, food shortage is becoming one of the most serious global problems in this century 1. Grain size is one of the determining factors for grain yield and thus is a prime target for genetic breeding 2,3. Although a number of quantitative trait loci (QTLs) associated with rice grain size have been identified in the past decade, mechanisms underlying their functions remain largely unknown 4,5. Here we show that a grain-length-associated QTL, GL2, has the potential to improve grain weight and grain yield up to 27.1% and 16.6%, respectively. We also show that GL2 is allelic to OsGRF4 and that it contains mutations in the miR396 targeting sequence. Because of the mutation, GL2 has a moderately increased expression level, which consequently activates brassinosteroid responses by upregulating a large number of brassinosteroid-induced genes to promote grain development. Furthermore, we found that GSK2, the central negative regulator of rice brassinosteroid signalling, directly interacts with OsGRF4 and inhibits its transcription activation activity to mediate the specific regulation of grain length by the hormone. Thus, this work demonstrates the feasibility of modulating specific brassinosteroid responses to improve plant productivity. |
英文摘要: |
Given the continuously growing population and decreasing arable land, food shortage is becoming one of the most serious global problems in this century 1. Grain size is one of the determining factors for grain yield and thus is a prime target for genetic breeding 2,3. Although a number of quantitative trait loci (QTLs) associated with rice grain size have been identified in the past decade, mechanisms underlying their functions remain largely unknown 4,5. Here we show that a grain-length-associated QTL, GL2, has the potential to improve grain weight and grain yield up to 27.1% and 16.6%, respectively. We also show that GL2 is allelic to OsGRF4 and that it contains mutations in the miR396 targeting sequence. Because of the mutation, GL2 has a moderately increased expression level, which consequently activates brassinosteroid responses by upregulating a large number of brassinosteroid-induced genes to promote grain development. Furthermore, we found that GSK2, the central negative regulator of rice brassinosteroid signalling, directly interacts with OsGRF4 and inhibits its transcription activation activity to mediate the specific regulation of grain length by the hormone. Thus, this work demonstrates the feasibility of modulating specific brassinosteroid responses to improve plant productivity. |
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Nature Plants |
英文刊物名称: |
Nature Plants |
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其它备注: |
Ronghui Che,Hongning Tong,Bihong Shi,Yuqin Liu,Shanru Fang,Dapu Liu,Yunhua Xiao,Bin Hu,Linchuan Liu,Hongru Wang,Mingfu Zhao & Chengcai Chu. Control of grain size and rice yield by GL2-mediated brassinosteroid responses. Nature Plants. DOI:10.1038/nplants.2015.195 |
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