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TaLBD41 interacts with TaNAC2 to regulate nitrogen uptake and metabolism in response to nitrate availability

文献类型： 外文期刊

作者： Jing, Yanfu 1 ; Shen, Chuncai 1 ; Li, Wenjing 3 ; Peng, Lei 1 ; Hu, Mengyun 4 ; Zhang, Yingjun 4 ; Zhao, Xueqiang 1 ; Teng, Wan 1 ; Tong, Yiping 1 ; He, Xue 1 ;

作者机构： 1.Chinese Acad Sci, Inst Genet & Dev Biol, Innovat Acad Seed Design, Key Lab Seed Innovat, Beijing 100101, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

3.Yazhouwan Natl Lab, Sanya 572024, Peoples R China

4.Hebei Acad Agr & Forestry Sci, Inst Cereal & Oil Crops, Shijiazhuang 050035, Peoples R China

关键词： nitrate-starvation response; nitrogen use efficiency; primary nitrate response; protein interaction; transcription factor; wheat

期刊名称：NEW PHYTOLOGIST （ 影响因子：9.4； 五年影响因子：10.5 ）

ISSN： 0028-646X

年卷期： 2024 年 242 卷 2 期

页码：

收录情况： SCI

摘要： Nitrate is the main source of nitrogen (N) available to plants and also is a signal that triggers complex regulation of transcriptional networks to modulate a wide variety of physiological and developmental responses in plants. How plants adapt to soil nitrate fluctuations is a complex process involving a fine-tuned response to nitrate provision and N starvation, the molecular mechanisms of which remain largely uncharted. Here, we report that the wheat transcription factor TaLBD41 interacts with the nitrate-inducible transcription factor TaNAC2 and is repressed by nitrate provision. Electrophoretic mobility shift assay and dual-luciferase system show that the TaLBD41-NAC2 interaction confers homeostatic coordination of nitrate uptake, reduction, and assimilation by competitively binding to TaNRT2.1, TaNR1.2, and TaNADH-GOGAT. Knockdown of TaLBD41 expression enhances N uptake and assimilation, increases spike number, grain yield, and nitrogen harvest index under different N supply conditions. We also identified an elite haplotype of TaLBD41-2B associated with increased spike number and grain yield. Our study uncovers a novel mechanism underlying the interaction between two transcription factors in mediating wheat adaptation to nitrate availability by antagonistically regulating nitrate uptake and assimilation, providing a potential target for designing varieties with efficient N use in wheat (Triticum aestivum).

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