Journal of Integrative Agriculture ›› 2026, Vol. 25 ›› Issue (3): 1020-1035.DOI: 10.1016/j.jia.2025.11.021

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StCOMT1通过调节香豆素相关物质积累和ROS系统增强马铃薯对拟枝孢镰刀菌的抗性

  

  • 收稿日期:2024-11-11 修回日期:2025-11-15 接受日期:2025-05-19 出版日期:2026-03-20 发布日期:2026-02-06

StCOMT1 enhances potato resistance to Fusarium sporotrichioides by regulating coumarin-related substance accumulation and the ROS system

Jiaqi Wang1, 2*, Biao Zhao1, 2*, Dan Liu1, Fumeng He1, Chong Du1, Yunzhu Che1, Zengli Zhang1, Xu Feng1, Xue Wang3 ,Yingnan Wang1#, Fenglan Li1, 2, 3#   

  1. 1 College of Life Sciences, Northeast Agricultural University, Harbin 150030, China

    2 Heilongjiang High Quality Agricultural Functional Microbial Agent Engineering and Technology Research Centre, Harbin 150030, China

    3 Heilongjiang Green Food Science Research Institute, Harbin 150028, China

  • Received:2024-11-11 Revised:2025-11-15 Accepted:2025-05-19 Online:2026-03-20 Published:2026-02-06
  • About author:Jiaqi Wang, E-mail: wjq13941677600@163.com; Biao Zhao, E-mail: zhaob35@outlook.com; #Correspondence Yingnan Wang, E-mail: yingnan1027@foxmail.com; Fenglan Li, E-mail: lifenglan@neau.edu.cn
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (U22A20443); the Heilongjiang Provincial Research Institutes Scientific Research Operating Expenses Project, China (CZKYF2023-1-B020); the Key Research and Development Plan Project of Heilongjiang Province, China (GA23B015) and the Young Scientists Fund of the National Natural Science Foundation of China (32201717). 

摘要:

咖啡酸-O-甲基转移酶(COMT)是苯丙烷代谢途径中的关键酶,在木质素与香豆素代谢途径中都发挥着重要作用。COMT在植物抗病方面的功能已在多个物种得到证实。本研究在全基因组水平对马铃薯COMT基因家族进行了鉴定,并通过系统发育分析结合前期代谢差异、加权基因共表达网络分析(WGCNA),确定了StCOMT1是脱氧雪腐镰刀菌烯醇(DON)诱导下增强马铃薯抗病性增强的候选基因。为了更好地了解StCOMT1基因的功能,我们进行了StCOMT1的异源表达与过表达。StCOMT1定位于叶绿体中,异源表达发现它可以催化底物的甲基化生成阿魏酸与褪黑素。生理指标显示相较于野生型马铃薯植株,StCOMT1过表达植株受到拟枝孢镰刀菌感染后病斑面积更小,活性氧(ROS)水平降低。基于高效液相色谱(HPLC)表达谱与RT-qPCR数据的分析发现,接菌后,在StCOMT1过表达植株中香豆素相关化合物与香豆素相关基因呈现器官差异积累与表达。结果表明StCOMT1过表达马铃薯通过增强活性氧清除,促进香豆素相关化合物器官特异性积累,从而增强对拟枝孢镰刀菌的抗性。

Abstract:

Caffeic acid-O-methyltransferase (COMT) is a crucial enzyme in the phenylpropanoid metabolic pathway, with significant roles in both the lignin and coumarin pathways.  The function of COMT in plant disease resistance has been demonstrated in several species.  Our research identified the potato COMT gene family on a genome-wide scale and StCOMT1 as a candidate gene for enhancing potato disease resistance under DON induction through phylogenetic analyses combined with previously identified metabolic differences and weighted gene co-expression network analysis (WGCNA) results.  In order to better understand the function of StCOMT1, heterologous expression and overexpression assays were conducted.  StCOMT1 is localized in chloroplasts and was found to catalyze the methylation of substrates to produce ferulic acid and melatonin in vitro.  Physiological parameters showed that, compared with wild-type potato plants, StCOMT1-overexpressing plants infected with Fusarium sporotrichioides exhibited smaller lesion areas and lower reactive oxygen species (ROS) levels.  High-performance liquid chromatography (HPLC) and RT-qPCR analyses revealed organ-specific accumulation of coumarin-related compounds and organ-specific expression of their corresponding genes in StCOMT1-overexpressing plants post-inoculation.  The results indicate that StCOMT1 overexpression in potatoes enhanced resistance to F. sporotrichioides by enhancing reactive oxygen species clearance and promoting organ-specific accumulation of coumarin-related compounds.

Key words: potato , COMT gene ,  overexpression ,  disease resistance ,  ROS scavenging