A wheat transcription factor positively sets seed vigour by regulating the grain nitrate signal
文献类型： 外文期刊
作者： Li, Wenjing 1 ; He, Xue 1 ; Chen, Yi 3 ; Jing, Yanfu 1 ; Shen, Chuncai 1 ; Yang, Junbo 1 ; Teng, Wan 1 ; Zhao, Xueqiang 1 ;
作者机构： 1.Chinese Acad Sci, Innovat Acad Seed Design, Inst Genet & Dev Biol, State Key Lab Plant Cell & Chromosome Engn, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Shanghai Inst Biol Sci, CAS JIC Ctr Excellence Plant & Microbial Sci CEPA, Shanghai 200032, Peoples R China
4.Norwich Res Pk, John Innes Ctr, Dept Metab Biol, Norwich NR4 7UH, Norfolk, England
5.Hebei Acad Agr & Forestry Sci, Inst Cereal & Oil Crops, Shijiazhuang 050035, Hebei, Peoples R China
关键词： NAC transcriptional factor; NRT2; NUE; seed vigour; wheat
期刊名称：NEW PHYTOLOGIST （ 影响因子：10.151； 五年影响因子：10.475 ）
ISSN： 0028-646X
年卷期： 2020 年 225 卷 4 期
页码：
收录情况： SCI
摘要： Seed vigour and early establishment are important factors determining the yield of crops. A wheat nitrate-inducible NAC transcription factor, TaNAC2, plays a critical role in promoting crop growth and nitrogen use efficiency (NUE), and now its role in seed vigour is revealed. A TaNAC2 regulated gene was identified that is a NRT2-type nitrate transporter TaNRT2.5 with a key role in seed vigour. Overexpressing TaNAC2-5A increases grain nitrate concentration and seed vigour by directly binding to the promoter of TaNRT2.5-3B and positively regulating its expression. TaNRT2.5 is expressed in developing grain, particularly the embryo and husk. In Xenopus oocyte assays TaNRT2.5 requires a partner protein TaNAR2.1 to give nitrate transport activity, and the transporter locates to the tonoplast in a tobacco leaf transient expression system. Furthermore, in the root TaNRT2.5 and TaNRT2.1 function in post-anthesis acquisition of soil nitrate. Overexpression of TaNRT2.5-3B increases seed vigour, grain nitrate concentration and yield, whereas RNA interference of TaNRT2.5 has the opposite effects. The TaNAC2-NRT2.5 module has a key role in regulating grain nitrate accumulation and seed vigour. Both genes can potentially be used to improve grain yield and NUE in wheat.
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