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Rht24b, an ancient variation of TaGA2ox-A9, reduces plant height without yield penalty in wheat

文献类型： 外文期刊

作者： Tian, Xiuling 1 ; Xia, Xianchun 1 ; Xu, Dengan 1 ; Liu, Yongqiang 2 ; Xie, Li 1 ; Hassan, Muhammad Adeel 1 ; Song, Jie 1 ;

作者机构： 1.Chinese Acad Agr Sci CAAS, Natl Wheat Improvement Ctr, Inst Crop Sci, 12 Zhongguancun South St, Beijing 100081, Peoples R China

2.Chinese Acad Sci, Innovat Acad Seed Design, Inst Genet & Dev Biol, State Key Lab Plant Genom, 1 West Beichen Rd, Beijing 100101, Peoples R China

3.Shandong Acad Agr Sci, Crop Res Inst, 202 Ind North Rd, Jinan 250100, Peoples R China

4.CAAS, Int Maize & Wheat Improvement Ctr CIMMYT China Of, 12 Zhongguancun South St, Beijing 100081, Peoples R China

关键词： GA 2-oxidase; grain yield; plant height; Rht24; wheat (Triticum aestivum)

期刊名称：NEW PHYTOLOGIST （ 影响因子：10.152； 五年影响因子：10.476 ）

ISSN： 0028-646X

年卷期：

页码：

收录情况： SCI

摘要： Rht-B1b and Rht-D1b, the 'Green Revolution' (GR) genes, greatly improved yield potential of wheat under nitrogen fertilizer application, but reduced coleoptile length, seedling vigor and grain weight. Thus, mining alternative reduced plant height genes without adverse effects is urgently needed. We isolated the causal gene of Rht24 through map-based cloning and characterized its function using transgenic, physiobiochemical and transcriptome assays. We confirmed genetic effects of the dwarfing allele Rht24b with an association analysis and also traced its origin and distribution. Rht24 encodes a gibberellin (GA) 2-oxidase, TaGA2ox-A9. Rht24b conferred higher expression of TaGA2ox-A9 in stems, leading to a reduction of bioactive GA in stems but an elevation in leaves at the jointing stage. Strikingly, Rht24b reduced plant height, but had no yield penalty; it significantly increased nitrogen use efficiency, photosynthetic rate and the expression of related genes. Evolutionary analysis demonstrated that Rht24b first appeared in wild emmer and was detected in more than half of wild emmer and wheat accessions, suggesting that it underwent both natural and artificial selection. These findings uncover an important genetic resource for wheat breeding and also provide clues for dissecting the regulatory mechanisms underlying GA-mediated morphogenesis and yield formation.

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