ZmNRT1.1B (ZmNPF6.6) determines nitrogen use efficiency via regulation of nitrate transport and signalling in maize
文献类型： 外文期刊
作者： Cao, Huairong 1 ; Liu, Zhi 1 ; Guo, Jia 2 ; Jia, Zhongtao 1 ; Shi, Yandong 1 ; Kang, Kai 1 ; Peng, Wushuang 1 ; Wang, Zhangkui 1 ; Chen, Limei 3 ; Neuhaeuser, Benjamin 4 ; Wang, Yong 5 ; Liu, Xiangguo 2 ; Hao, Dongyun 2 ; Yuan, Lixing 1 ;
作者机构： 1.China Agr Univ, Natl Acad Agr Green Dev, Coll Resources & Environm Sci, State Key Lab Nutrient Use & Management, Beijing, Peoples R China
2.Jilin Acad Agr Sci JAAS, Inst Agr Biotechnol, Key Lab Agr Biotechnol Jilin Prov, Jilin, Peoples R China
3.China Agr Univ, Coll Biol Sci, Ctr Crop Funct Genom & Mol Breeding, State Key Lab Plant Environm Resilience, Beijing, Peoples R China
4.Univ Hohenheim, Inst Crop Sci, Dept Nutr Crop Physiol, Stuttgart, Germany
5.Shandong Agr Univ, Coll Life Sci, Natl Key Lab Wheat Improvement, Tai An, Shandong, Peoples R China
关键词： Nitrate transport; nitrate signalling; nitrogen use efficiency (NUE); ZmNRT1.1B; ZmNLP3.1; grain yield
期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：13.8； 五年影响因子：13.2 ）
ISSN： 1467-7644
年卷期： 2023 年
页码：
收录情况： SCI
摘要： Nitrate (NO3-) is crucial for optimal plant growth and development and often limits crop productivity under low availability. In comparison with model plant Arabidopsis, the molecular mechanisms underlying NO3- acquisition and utilization remain largely unclear in maize. In particular, only a few genes have been exploited to improve nitrogen use efficiency (NUE). Here, we demonstrated that NO3--inducible ZmNRT1.1B (ZmNPF6.6) positively regulated NO3--dependent growth and NUE in maize. We showed that the tandem duplicated proteoform ZmNRT1.1C is irrelevant to maize seedling growth under NO3- supply; however, the loss of function of ZmNRT1.1B significantly weakened plant growth under adequate NO3- supply under both hydroponic and field conditions. The 15N-labelled NO3- absorption assay indicated that ZmNRT1.1B mediated the high-affinity NO3--transport and root-to-shoot NO3- translocation. Transcriptome analysis further showed, upon NO3- supply, ZmNRT1.1B promotes cytoplasmic-to-nuclear shuttling of ZmNLP3.1 (ZmNLP8), which co-regulates the expression of genes involved in NO3- response, cytokinin biosynthesis and carbon metabolism. Remarkably, overexpression of ZmNRT1.1B in modern maize hybrids improved grain yield under N-limiting fields. Taken together, our study revealed a crucial role of ZmNRT1.1B in high-affinity NO3- transport and signalling and offers valuable genetic resource for breeding N use efficient high-yield cultivars.
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