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Identification of a novel gain-of-function mutant allele, slr1-d5, of rice DELLA protein

文献类型： 外文期刊

作者： Zhang Yun-hui 1 ; Bian Xiao-feng 1 ; Zhang Suo-bing 1 ; Ling Jing 1 ; Wang Ying-jie 1 ; Wei Xiao-ying 2 ; Fang Xian-we 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Food Crops, Jiangsu Prov Key Lab Agrobiol, Jiangsu Prov Platform Conservat & Utilizat Agr Ge, Nanjing 210014, Jiangsu, Peoples R China

2.Shandong Business Inst, Yantai 264670, Peoples

关键词： rice;dominant dwarf;DELLA protein;gibberellin

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：2.848； 五年影响因子：2.979 ）

ISSN： 2095-3119

年卷期： 2016 年 15 卷 7 期

页码：

收录情况： SCI

摘要： Controlling the height of crops plays a crucial role for their yields. The large scale utilization of semi-dwarf varieties has greatly improved crop yield, providing an effective support for world food security. In rice, a main food for over half of the world's population, a number of dwarf loci have been identified. However, most of them are recessive, such as the 'green revolution' gene sd1. To gain more beneficial loci for rice breeding programs, exploring new mutations is needed, especially the dominant loci which can be used broadly for hybrid breeding. Here, we isolated a novel dominant dwarf rice mutant, slr1-d5. All of the internodes of slr1-d5 are reduced. We find that the responsiveness of slr1-d5 to gibberellin (GA), GA(3), was significantly reduced. Map-based cloning revealed that the dominant dwarfism of slr1-d5 was caused by an amino acid substitution in the N-terminal TVHYNP domain of rice DELLA protein, SLR1, where the conserved amino acid Pro (P) was substituted to His (H). Our findings not only further prove the pivotal role of TVHYNP motif in regulating SLR1 stability, but also provide a new dwarf source for improvement of rice germplasms.

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