NIN-LIKE PROTEIN3.2 inhibits repressor Aux/IAA14 expression and enhances root biomass in maize seedlings under low nitrogen
文献类型： 外文期刊
作者： Wang, Ruifeng 1 ; Zhong, Yanting 1 ; Han, Jienan 2 ; Huang, Liangliang 1 ; Wang, Yongqi 1 ; Shi, Xionggao 1 ; Li, Mengfei 4 ; Zhuang, Yao 5 ; Ren, Wei 6 ; Liu, Xiaoting 1 ; Cao, Huairong 1 ; Xin, Beibei 3 ; Lai, Jinsheng 3 ; Chen, Limei 7 ; Chen, Fanjun 1 ; Yuan, Lixing 1 ; Wang, Yi 7 ; Li, Xuexian 1 ;
作者机构： 1.China Agr Univ, Coll Resources & Environm Sci, State Key Lab Nutrient Use & Management, Beijing 100193, Peoples R China
2.Chinese Acad Agr Sci, Inst Crop Sci, Beijing 100081, Peoples R China
3.China Agr Univ, Natl Maize Improvement Ctr, Dept Plant Genet & Breeding, State Key Lab Maize Biobreeding, Beijing 100193, Peoples R China
4.China Agr Univ, Coll Agron & Biotechnol, Natl Maize Improvement Ctr, Joint Int Res Lab Crop Mol Breeding,Beijing Key La, Beijing 100193, Peoples R China
5.Zhejiang Univ, Coll Nat Resources & Environm Sci, State Key Lab Plant Environm Resilience, Hangzhou 310058, Peoples R China
6.China Agr Univ, Coll Grassland Sci & Technol, Beijing 100193, Peoples R China
7.China Agr Univ, Coll Biol Sci, State Key Lab Plant Environm Resilience, Beijing 100193, Peoples R China
8.China Agr Univ, Ctr Crop Funct Genom & Mol Breeding, Beijing 100193, Peoples R China
期刊名称：PLANT CELL （ 影响因子：10.0； 五年影响因子：11.1 ）
ISSN： 1040-4651
年卷期： 2024 年
页码：
收录情况： SCI
摘要： Plants generally enhance their root growth in the form of greater biomass and/or root length to boost nutrient uptake in response to short-term low nitrogen (LN). However, the underlying mechanisms of short-term LN-mediated root growth remain largely elusive. Our genome-wide association study, haplotype analysis, and phenotyping of transgenic plants showed that the crucial nitrate signaling component NIN-LIKE PROTEIN3.2 (ZmNLP3.2), a positive regulator of root biomass, is associated with natural variations in root biomass of maize (Zea mays L.) seedlings under LN. The monocot-specific gene AUXIN/INDOLE-3-ACETIC ACID14 (ZmAux/IAA14) exhibited opposite expression patterns to ZmNLP3.2 in ZmNLP3.2 knockout and overexpression lines, suggesting that ZmNLP3.2 hampers ZmAux/IAA14 transcription. Importantly, ZmAux/IAA14 knockout seedlings showed a greater root dry weight (RDW), whereas ZmAux/IAA14 overexpression reduced RDW under LN compared with wild-type plants, indicating that ZmAux/IAA14 negatively regulates the RDW of LN-grown seedlings. Moreover, in vitro and vivo assays indicated that AUXIN RESPONSE FACTOR19 (ZmARF19) binds to and transcriptionally activates ZmAux/IAA14, which was weakened by the ZmNLP3.2-ZmARF19 interaction. The zmnlp3.2 ZmAux/IAA14-OE seedlings exhibited further reduced RDW compared with ZmAux/IAA14 overexpression lines when subjected to LN treatment, corroborating the ZmNLP3.2-ZmAux/IAA14 interaction. Thus, our study reveals a ZmNLP3.2-ZmARF19-ZmAux/IAA14 module regulating root biomass in response to nitrogen limitation in maize. In nitrogen-limited growth conditions, the levels of a nitrate signaling component rise in maize seedlings, triggering the inhibition of a root growth repressor, and increased root biomass.
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