Endophytic bacterial and fungal dynamics of community structures in lettuce stem and soil during invasion by the fungal pathogen Sclerotinia sclerotiorum

文献类型： 外文期刊

第一作者： Zhang, Jian

作者： Zhang, Jian;Xia, Rui;Tao, Zhen;Zhang, Jian;Zhang, Jian;Xia, Rui;Xia, Rui

作者机构：

关键词： Beneficial bacteria; Lettuce seedling; Microbial species; Soil condition; Stem vegetable

期刊名称：JOURNAL OF PLANT PATHOLOGY （ 影响因子：2.0； 五年影响因子：2.3 ）

ISSN： 1125-4653

年卷期： 2025 年 107 卷 1 期

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收录情况： SCI

摘要： Lettuce stem is considered an essential and important fresh edible vegetable tissue worldwide. The regulation of beneficial endophytic microbes in host stems is vital to plant growth and yield, but information about microbial community structures in lettuce stems remains limited. In this study, endophytic bacterial and fungal community structures in stems and soil at three stem-expansion stages were analyzed through Illumina sequencing. Results showed that the Shannon index of bacteria in lettuce soil was greatly higher than the number of endophytic bacteria in the stems. A total of 212 core operational taxonomic units (OTUs) were observed in the bacterial group; and 16, in the fungal group. The distribution of endophytic bacteria and fungi varied in the stem and soil, showing changes in the stem with rotting due a fungal pathogen (Sclerotinia sclerotiorum) invasion. Bacterial groups, such as Gammaproteobacteria, had high abundances in the stems. The dominant bacterial group in soil included Gammaproteobacteria, Alphaproteobacteria, and Actinobacteria, and the number of Sclerotiniaceae extensively increased in the rotten stem. Bacterial genes in soil are mainly involved in quorum sensing and carbon, glyoxylate, and dicarboxylate metabolism. Meanwhile, bacterial genes inside stems are mainly involved in bacterial chemotaxis, biofilm formation, and amino acid biosynthesis. Fungal genes in rotten stem have similar function pathways to those in soil samples. This work clarifies the bacterial and fungal community shifts in lettuce stems and root soil, and the findings provide insights as to how to promote lettuce growth and control the occurrence of sclerotinia stem rot.

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