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

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Title Rht24b, an ancient variation of TaGA2ox-A9, reduces plant height without yield penalty in wheat
 
Creator Xiuling Tian
Xianchun Xia
Dengan Xu
Yongqiang Liu
Li Xie
Hassan, Muhammad Adeel
Jie Song
Faji Li
Desen Wang
Yong Zhang
Yuanfeng Hao
Genying Li
Chengcai Chu
He Zhonghu
Shuanghe Cao
 
Subject gibberellins
oxidoreductases
grain
plant height
genes
wheat
 
Description 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.
 
Date 2022-01
2023-02-26T17:35:27Z
2023-02-26T17:35:27Z
 
Type Journal Article
 
Identifier Tian, X., Xia, X., Xu, D., Liu, Y., Xie, L., Hassan, M. A., Song, J., Li, F., Wang, D., Zhang, Y., Hao, Y., Li, G., Chu, C., He, Z. and Cao, S. 2022. Rht24b, an ancient variation of taga2ox‐a9, reduces plant height without yield penalty in wheat. New Phytologist 233(2):738–750.
1469-8137
https://hdl.handle.net/10568/129061
https://doi.org/10.1111/nph.17808
 
Language en
 
Rights Copyrighted; all rights reserved
Limited Access
 
Format p. 738-750
 
Publisher Wiley
 
Source New Phytologist