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

第一作者： Wang, Ruifeng

作者： Wang, Ruifeng;Zhong, Yanting;Wang, Yongqi;Liu, Xiaoting;Cao, Huairong;Chen, Fanjun;Yuan, Lixing;Li, Xuexian;Han, Jienan;Xin, Beibei;Lai, Jinsheng;Li, Mengfei;Zhuang, Yao;Ren, Wei;Chen, Limei;Wang, Yi;Chen, Limei;Wang, Yi;Li, Xuexian

作者机构：

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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