TaNAM-6A is essential for nitrogen remobilisation and regulates grain protein content in wheat (Triticum aestivum L.)

文献类型： 外文期刊

第一作者： Meng, Xinhao

作者： Meng, Xinhao;Zhai, Shanshan;Zhang, Runqi;Liu, Guoyu;Xu, Weiya;Yu, Jiazheng;Zhang, Yufeng;Ni, Zhongfu;Sun, Qixin;Xing, Jiewen;Li, Baoyun;Lou, Hongyao

作者机构：

关键词： elite haplotype; GPC; nitrate transporter 1/peptide family; nitrogen transport; TaNAM

期刊名称：PLANT CELL AND ENVIRONMENT （ 影响因子：6.0； 五年影响因子：7.6 ）

ISSN： 0140-7791

年卷期： 2024 年 47 卷 6 期

页码：

收录情况： SCI

摘要： Grain protein content (GPC) is a crucial quality trait in bread wheat, which is influenced by the key transcription factor TaNAM. However, the regulatory mechanisms of TaNAM have remained largely elusive. In this study, a new role of TaNAM was unveiled in regulating nitrogen remobilisation which impacts GPC. The TaNAM knockout mutants generated by clustered regularly interspaced short palindromic repeats/Cas9 exhibited significantly delayed senescence and lower GPC, while overexpression of TaNAM-6A resulted in premature senility and much higher GPC. Further analysis revealed that TaNAM directly activates the genes TaNRT1.1 and TaNPF5.5s, which are involved in nitrogen remobilisation. This activity aids in the transfer of nitrogen from leaves to grains for protein synthesis. In addition, an elite allele of TaNAM-6A, associated with high GPC, was identified as a candidate gene for breeding high-quality wheat. Overall, our work not only elucidates the potential mechanism of TaNAM-6A affecting bread wheat GPC, but also highlights the significance of nitrogen remobilisation from senescent leaves to grains for protein accumulation. Moreover, our research provides a new target and approach for improving the quality traits of wheat, particularly the GPC.

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