基于非靶向代谢组学分析丛枝病感病与未感病苦豆子代谢物的差异
赛牙热木·哈力甫 , 杨莉 , 李冠宏 , 朱永琪 , 李东
草业学报 ›› 2025, Vol. 34 ›› Issue (05) : 105 -117.
基于非靶向代谢组学分析丛枝病感病与未感病苦豆子代谢物的差异
Analysis of metabolite differences in Sophora alopecuroides infected and non-infected by witches’ broom disease based on non-targeted metabolomics
植原体会导致寄主植物黄化、顶枯、丛枝、簇生、小叶、矮化、花变叶等症状,迄今我国植原体病害有100多种,包括重要的经济作物、中草药及林木等病害。由植原体引起的苦豆子丛枝病导致寄主生长被抑制、种子绝收、产量降低等,对我国苦豆子相关产业带来了潜在的威胁。以植原体侵染感病苦豆子、健康苦豆子为研究对象,利用形态学、分子生物学、非靶向代谢组学分析苦豆子丛枝病病原及病原侵染对苦豆子代谢物的影响。结果表明引起苦豆子丛枝病的病原菌为16Sr V-B亚组成员;病原感染显著改变了苦豆子代谢物,差异代谢物主要注释到环境信息处理、遗传信息处理和新陈代谢三大功能,其中新陈代谢占92.38%,通过KEGG通路气泡图分析发现卟啉和叶绿素代谢及苯丙氨酸、酪氨酸和色氨酸的生物合成通路具有显著差异,初步推测病原菌的侵染主要通过寄主代谢物的变化引起寄主植物的感病,其中以上2个通路的变化对苦豆子丛枝病的发生具有重要的作用,即病原菌的侵染降低寄主光合能力从而引起营养匮乏及抗性降低引起感病。
Phytoplasma is a bacterial pathogen that induces a range of symptoms in host plants, including yellowing, apical necrosis, witches’ broom, phyllody, dwarfism, and floral changes. In China, more than 100 types of phytoplasma diseases have been identified that affect important economic crops, traditional Chinese medicinal herbs, and forestry. Witches’ broom disease, caused by phytoplasma infection in Sophora alopecuroides, inhibits growth, causes seed production failure, and reduces yield, posing a potential threat to industries that utilize S. alopecuroides in China. This study focused on the impact of phytoplasma infection on S. alopecuroides metabolites by comparing infected and healthy plants using morphological, molecular biological, and untargeted metabolomic analyses. Our results indicate that the phytoplasma strain causing witches’ broom disease in S. alopecuroides belongs to the 16Sr V-B subgroup. Infection significantly altered the metabolite profile of S. alopecuroides, with differentially annotated metabolites primarily associated with environmental information processing, genetic information processing, and metabolism, with the latter constituting 92.38% of total observed metabolite changes. KEGG pathway analysis revealed significant differences in the porphyrin and chlorophyll metabolism pathways as well as in the biosynthesis of phenylalanine, tyrosine, and tryptophan. It is speculated that phytoplasma infection may induce disease symptoms in the host plant primarily through changes in host metabolites. Alterations in these two pathways play a crucial role in the occurrence of witches’ broom disease in S. alopecuroides, suggesting that infection reduces the photosynthetic capacity of the host, leading to nutrient deficiency and decreased resistance, which in turn aids disease progression.
Sophora alopecuroides / witches’ broom disease / non-targeted metabolomics / KEGG analysis
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石河子大学高层次人才科研启动项目(RCZK2021B23)
石河子大学自主资助支持专项(ZZZC2022009)
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