文献类型：期刊文献

英文题名：Comprehensive analysis of class III peroxidase genes revealed PePRX2 enhanced lignin biosynthesis and drought tolerance in Phyllostachys edulis

作者：Jia, Yuhan[1,2] Li, Mengyun[1,2] Xu, Jing[1,2] Chen, Shuxin[1,2] Han, Xiaojiao[1,2] Qiu, Wenmin[1,2] Lu, Zhuchou[1,2] Zhuo, Renying[1,2] Qiao, Guirong[1,2]

第一作者：Jia, Yuhan

通信作者：Qiao, GR[1];Qiao, GR[2]

机构：[1]Chinese Acad Forestry, State Key Lab Tree Genet & Breeding, 12 Zhongguancun South St, Beijing 100091, Peoples R China;[2]Chinese Acad Forestry, Res Inst Subtrop Forestry, Res Inst Subtrop Forestry, 73 Daqiao Rd, Hangzhou 311400, Zhejiang, Peoples R China

年份：2025

卷号：45

期号：2

外文期刊名：TREE PHYSIOLOGY

收录：;Scopus(收录号：2-s2.0-86000476010);WOS:【SCI-EXPANDED(收录号:WOS:001436751800001)】；

基金：This work was supported by the National Key Research and Development Program of China (Grant No. 2021YFD2200504) and the National Non-profit Institute Research Grant of Chinese Academy of Forestry (Grant No. CAFYBB2020ZB004).

语种：英文

外文关键词：drought stress; lignin deposition; moso bamboo; PRX; transcriptional regulation

摘要：Class III peroxidase (PRX) is the key enzyme in lignin biosynthesis and critical for maintaining the redox balance in plants to respond to stress. In moso bamboo (Phyllostachys edulis), a globally significant non-timber forestry species, the potential roles of PRX genes remain largely unknown. In this research, a total of 179 PePRXs was identified on a genome-wide scale in moso bamboo. Phylogenic relationship, conserved motifs, gene structure, collinearity and cis-acting elements were investigated. Analysis of gene expression indicated that PePRXs exhibited tissue-specific expression and different response patterns to hormones and abiotic stresses. Based on the transcriptome data, 10 PePRXs with positive correlations between expression levels and lignification degree were screened out. Among them, PePRX2 was selected as a candidate gene according to the co-expression network. Y1H and Dual-Luc assays demonstrated that PeMYB61 could bind to the promoter of PePRX2 and enhance its transcription. The result of in situ hybridization showed that PePRX2 was specifically expressed in the vascular bundle sheath cells of bamboo shoot. As a secreted protein, PePRX2 was located on the cell wall. Overexpression of PePRX2 led to a significant increase in lignin content in transgenic poplar, indicating that PePRX2 could promote lignin polymerization. In comparison with the WT, the PePRX2-OE poplar lines exhibited increased peroxidase activity and decreased levels of MDA, O2- and H2O2 under drought stress, indicating enhanced drought resistance. This thorough analysis of the PRX family in moso bamboo provided new insight into the roles of PePRXs in lignin biosynthesis and drought adaptation.