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Genome-wide identification of the nuclear redox protein gene family revealed its potential role in drought stress tolerance in rice

文献类型： 外文期刊

作者： Liu, Zijie 1 ; Zheng, Xingfei 2 ; Yang, Dabing 2 ; Li, Lanzhi 1 ; Yin, Hexing 3 ;

作者机构： 1.Hunan Agr Univ, Coll Plant Protect, Hunan Engn & Technol Res Ctr Agr Big Data Anal & D, Changsha, Peoples R China

2.Hubei Acad Agr Sci, Food Crop Inst, Hubei Key Lab Food Crop Germplasm & Genet Improvem, Wuhan, Peoples R China

3.Huazhi Biotechnol Co Ltd, Crop Phen Res Ctr, Changsha, Peoples R China

关键词： rice; nucleoredoxin gene family; drought stress; genome-wide identification; expression pattern

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：4.8； 五年影响因子：5.7 ）

ISSN： 1664-462X

年卷期： 2025 年 16 卷

页码：

收录情况： SCI

摘要： Introduction: Thioredoxins (TRX) are redox-active proteins critical for plant stress adaptation. As a TRX family member, nucleoredoxin (NRX) maintains drought-induced redox homeostasis, yet its genome-wide characterization in rice remains uninvestigated. Methods: Using HMMER3.0 (E-value <1e-5) and TBtools, we identified OsNRX genes across three rice varieties (Minghui63, Nipponbare, 9311). Conserved domains were verified by SMART/CDD, while promoter cis-elements were systematically predicted with PlantCARE. Tissue-specific expression patterns were analyzed using RiceXPro data, and drought responses were quantified via qRT-PCR in drought-tolerant (Jiangnong Zao 1B) versus sensitive (TAISEN GLUTINOUS YU 1157) varieties under PEG6000 stress. Results: Ten OsNRX genes were classified into three subfamilies (NRX1/NRX2/NRX3) exhibiting conserved domain architectures. Promoter analysis identified abundant stress-responsive elements (ABRE, MBS) and phytohormone signals (ABA/JA/SA). Tissue-specific expression profiles revealed NRX1a dominance in roots/hulls, versus NRX1b/NRX2 enrichment in endosperm. Drought stress triggered rapid OsNRX upregulation (20-53-fold within 3-6h), with tolerant varieties showing earlier NRX2 activation than sensitive counterparts. Discussion: OsNRX genes exhibit dynamic drought-responsive regulation, while their spatiotemporal expression in glumes, embryos, and endosperm suggests potential dual roles in stress adaptation and grain development. These results provide molecular targets for improving drought resilience in rice breeding.

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