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The wheat transcription factor Q functions in gibberellin biosynthesis and signaling and regulates height and spike length

文献类型： 外文期刊

作者： Liu, Pan 1 ; Xue, Shulin 2 ; Jia, Jizeng 1 ; Zhao, Guangyao 1 ; Liu, Jie 3 ; Hu, Yanzhen 1 ; Kong, Cuizheng 1 ; Yan, Dong 1 ; Wang, Huan 2 ; Liu, Xu 1 ; Lu, Zefu 1 ; Gao, Lifeng 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Crop Sci, State Key Lab Crop Gene Resources & Breeding, Beijing 100081, Peoples R China

2.Henan Univ, Sch Life Sci, State Key Lab Crop Stress Adaptat & Improvement, Kaifeng 475004, Henan, Peoples R China

3.China Agr Univ, State Key Lab Agrobiotechnol, Beijing 100193, Peoples R China

4.China Agr Univ, Key Lab Crop Heterosis & Utilizat MOE, Beijing 100193, Peoples R China

5.China Agr Univ, Beijing Key Lab Crop Genet Improvement, Beijing 100193, Peoples R China

期刊名称：PLANT CELL （ 影响因子：11.6； 五年影响因子：12.1 ）

ISSN： 1040-4651

年卷期： 2025 年 37 卷 8 期

页码：

收录情况： SCI

摘要： The Q gene is a key domestication gene in wheat (Triticum aestivum) that regulates free-threshing habit, spike morphology, height, and other critical agronomic traits. However, the precise molecular mechanisms underlying its function remain unclear. In this study, we identified a Q allele with a missense mutation (G to A) in the fifth exon of the Q gene, resulting in reduced plant height and spike length. Further investigation revealed that this mutation causes a Gly-229-Ser amino acid substitution, which enhances Q protein stability. Furthermore, we discovered that Q directly binds to the promoter region of Gibberellin 3-oxidase 2 gene (TaGA3ox2) and represses its expression. Moreover, Q interacts with both REDUCED HEIGHT1 (RHT1) and GIBBERELLIN INSENSITIVE 2 (TaGID2), which may disrupt GID2-triggered RHT1 degradation. Collectively, these findings reveal the dual roles of Q in regulating both GA biosynthesis and signaling, providing insights into the molecular mechanisms through which Q modulates plant height and spike length in wheat. An allele of the wheat transcription factor Q enhances Q protein stability, which inhibits gibberellin biosynthesis and signaling, resulting in reduced plant height and spike length.

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