数字农科院2.0

TaWUS-like-5D affects grain weight and filling by inhibiting the expression of sucrose and trehalose metabolism-related genes in wheat grain endosperm

文献类型： 外文期刊

作者： Liu, H. X.;Li, T.;Hou, J.;Yin, X. T.;Wang, Y. Q.;Si, X. M.;Rehman, Shoaib Ur;Zhuang, L.;Guo, W. L.;Hao, C. Y.;Zhang, X. Y.

作者机构：

关键词： wheat;Wox gene;TaWUS-like-5D;TKW;grain development;yield

期刊名称： PLANT BIOTECHNOLOGY JOURNAL

ISSN： 1467-7644

年卷期： 2025 年

页码：

收录情况： SCIE（2025版）

摘要： Plant-specific WUSCHEL-related homeobox (Wox) transcription factors (TFs) are crucial for plant growth and development. However, the molecular mechanism of Wox-mediated regulation of thousand kernel weight (TKW) in crops remains elusive. In this research, we identified a major TKW-associated quantitative trait locus (QTL) on wheat chromosome 5DS by performing a genome-wide association study (GWAS) of a Chinese wheat mini-core collection (MCC) in four environments combined by bulked segregant analysis (BSA) and bulked segregant RNA-sequencing (BSR-seq) of wheat grains exhibiting a wide range of TKWs. The candidate TaWUS-like-5D was highly expressed in developing grains and was found to strongly negative influence grain TKW and wheat yield. Meanwhile, the RNAi lines, CRISPR/Cas9-edited single and double knockout mutants (AABBdd and AAbbdd), as well as the stop-gained aaBB Kronos mutants, exhibited a significant increase in grain size and TKW (P < 0.05 or P < 0.01) and a 10.0% increase in yield (P < 0.01). Further analyses indicated that TaWUS-like-5D regulates TKW by inhibiting the transcription of sucrose, hormone and trehalose metabolism-related genes, subsequently sharply decreasing starch synthesis in wheat grains. The results of this study provide a fundamental molecular basis for further elucidating the mechanism of Wox-mediated regulation of grain development in crops.

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