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Investigating the Mechanisms Underlying Citral-Induced Oxidative Stress and Its Contribution to Antifungal Efficacy on Magnaporthe oryzae Through a Multi-Omics Approach

文献类型： 外文期刊

作者： Huang, Yonghui 1 ; Wang, Ruoruo 1 ; Tan, Yumei 1 ; Liu, Yongxiang 1 ; Ren, Xiyi 1 ; Guo, Congtao 1 ; Li, Rongyu 4 ; Li, Ming 4 ;

作者机构： 1.Guizhou Acad Agr Sci, Guizhou Inst Biotechnol, Guiyang 550006, Peoples R China

2.Minist Agr & Rural Affairs, Key Lab Crop Genet Resources & Germplasm Innovat K, Guiyang 550006, Peoples R China

3.Guizhou Key Lab Agr Microbiol, Guiyang 550006, Peoples R China

4.Guizhou Univ, Inst Crop Protect, Coll Agr, Guiyang 550025, Peoples R China

关键词： citral; Magnaporthe oryzae; antifungal activity; oxidative stress; widely-targeted metabolome; transcriptome

期刊名称：PLANTS-BASEL （ 影响因子：4.1； 五年影响因子：4.5 ）

ISSN： 2223-7747

年卷期： 2025 年 14 卷 13 期

页码：

收录情况： SCI

摘要： Citral, an organic compound found in lemongrass (Cymbopogon citratus) oil and Litsea cubeba essential oil, has been reported to exhibit notable antifungal activity against Magnaporthe oryzae (M. oryzae), the pathogen of rice blast, which causes significant economic losses in rice production. However, the role of citral in inducing oxidative stress related to antifungal ability and its underlying regulatory networks in M. oryzae remain unclear. In this study, we investigated the oxidative effects of citral on M. oryzae and conducted transcriptomic and widely targeted metabolomic (WTM) analyses on the mycelia. The results showed that citral induced superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX) activities but reduced glutathione S-transferase (GST) activity with 25% maximal effective concentration (EC25) and 75% maximal effective concentration (EC75). Importantly, citral at EC75 reduced the activities of mitochondrial respiratory chain complex I, complex III and ATP content, while increasing the activity of mitochondrial respiratory chain complex II. In addition, citral triggered a burst of reactive oxygen species (ROS) and a loss of mitochondrial membrane potential (MMP) through the observation of fluorescence. Furthermore, RNA-seq analysis and metabolomics analysis identified a total of 466 differentially expression genes (DEGs) and 32 differential metabolites (DAMs) after the mycelia were treated with citral. The following multi-omics analysis revealed that the metabolic pathways centered on AsA, GSH and melatonin were obviously suppressed by citral, indicating a disrupted redox equilibrium in the cell. These findings provide further evidences supporting the antifungal activity of citral and offer new insights into the response of M. oryzae under oxidative stress induced by citral.

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