Reducing expression of a nitrate-responsive bZIP transcription factor increases grain yield and N use in wheat
文献类型： 外文期刊
作者： Yang, Junbo 1 ; Wang, Meiyue 2 ; Li, Wenjing 1 ; He, Xue 1 ; Teng, Wan 1 ; Ma, Wenying 1 ; Zhao, Xueqiang 1 ; Hu, Mengyun 3 ;
作者机构： 1.Chinese Acad Sci, Inst Genet & Dev Biol, State Key Lab Plant Cell & Chromosome Engn, Beijing, Peoples R China
2.Chinese Acad Sci, Shanghai Inst Biol Sci, Shanghai, Peoples R China
3.Hebei Acad Agr & Forestry Sci, Inst Cereal & Oil Crops, Shijiazhuang, Hebei, Peoples R China
4.Chinese Acad Sci, Innovat Acad Seed Design, Beijing, Peoples R China
关键词： Triticum aestivum; leucine zipper transcription factor; NADH-dependent glutamate synthase; N use efficiency; grain yield
期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：9.803； 五年影响因子：9.555 ）
ISSN： 1467-7644
年卷期： 2019 年 17 卷 9 期
页码：
收录情况： SCI
摘要： Nitrogen (N) plays critical role in plant growth; manipulating N assimilation could be a target to increase grain yield and N use. Here, we show that ABRE-binding factor (ABF)-like leucine zipper transcription factor TabZIP60 mediates N use and growth in wheat. The expression of TabZIP60 is repressed when the N-deprived wheat plants is exposed to nitrate. Knock down of TabZIP60 through RNA interference (RNAi) increases NADH-dependent glutamate synthase (NADH-GOGAT) activity, lateral root branching, N uptake and spike number, and improves grain yield more than 25% under field conditions, while overexpression of TabZIP60-6D had the opposite effects. Further investigation shows TabZIP60 binds to ABRE-containing fragment in the promoter of TaNADH-GOGAT-3B and negatively regulates its expression. Genetic analysis reveals that TaNADH-GOGAT-3B overexpression overcomes the spike number and yield reduction caused by overexpressing TabZIP60-6D. As such, TabZIP60-mediated wheat growth and N use is associated with its negative regulation on TaNADH-GOGAT expression. These findings indicate that TabZIP60 and TaNADH-GOGAT interaction plays important roles in mediating N use and wheat growth, and provides valuable information for engineering N use efficiency and yield in wheat.
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