数字农科院2.0

Small world but large differences: cultivar-specific secondary metabolite-mediated phyllosphere fungal homeostasis in tea plant (Camellia sinensis)

文献类型： 外文期刊

作者： Ding, Kai;Lv, Wuyun;Ren, Hengze;Xiong, Fei;Zhang, Yuting;Zhang, Junhong;Tong, Zaikang;Wang, Xinchao;Wang, Yuchun

作者机构：

关键词： Tea plants;Secondary metabolites;Phyllosphere fungi homeostasis;Assembly process;Network stability

期刊名称： PLANT AND SOIL

ISSN： 0032-079X

年卷期： 2024 年

页码：

收录情况： SCIE（2024版）

摘要： Aims Phyllosphere microbes are closely linked to plant health and are important for the maintenance of host community stability. Tea plants (Camellia sinen-sis) can synthesize abundant secondary metabolites (SMs), however, it is unclear how they affect tea plant phyllosphere homeostasis. Methods We investigated the effects of secondary metabolites of two tea plant cultivars (Longjing43 and Zhongcha108) that have different levels of resistance to anthracnose on the composition, function, assembly and network of phyllosphere fungi. Results We found that the phyllosphere fungal compositions of Longjing43 and Zhongcha108 were distinct, with certain fungal pathogens significantly enriched in the susceptible cultivar Longjing43 (e.g., Fusarium), which had a higher relative abundance of phytopathogenic functional groups. In addition, the phyllosphere fungal community assembly of the resistant cultivar Zhongcha108 with a higher habitat niche breadth was more influenced by stochastic processes. More importantly, the fungal network of Zhongcha108 exhibited higher complexity and stability, indicating a more resilient network structure. Random forest and partial least squares path models revealed that secondary metabolites, fungal community diversity, composition and function essentially determined network stability. (-)-Epigallocatechin-3-gallate (EGCG) and caffeine (CAF) were the most important predictors of phyllosphere fungal network stability in 2018 and 2019, respectively. Rare fungal taxa were particularly important in maintaining phyl-losphere homeostasis. Conclusions Our study suggests that secondary metabolites may mediate phyllosphere fungal home-ostasis in tea plants. These findings highlight the importance of secondary metabolites in shaping the phyllosphere fungal community and provide ideas for regulating plant resistance to pathogenic fungi.

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