Different assembly mechanisms of leaf epiphytic and endophytic bacterial communities underlie their higher diversity in more diverse forests
Different assembly mechanisms of leaf epiphytic and endophytic bacterial communities underlie their higher diversity in more diverse forests
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DOI：
10.1111/1365-2745.14084
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发表时间：
2023-03
影响因子：
5.5
通讯作者：
Xian Yang;Pandeng Wang;B. Xiao;Qianna Xu;Q. Guo;Shaopeng Li;Lulu Guo;M. Deng;Jianbo Lu;Lingli Liu;K. Ma;B. Schmid;Lin Jiang
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作者：
Xian Yang;Pandeng Wang;B. Xiao;Qianna Xu;Q. Guo;Shaopeng Li;Lulu Guo;M. Deng;Jianbo Lu;Lingli Liu;K. Ma;B. Schmid;Lin Jiang
众所周知，植物微生物组影响寄主适应性和生态系统功能，但调节其结构的机制尚不清楚。本文通过亚热带森林生物多样性实验，探讨了叶片附生和内生细菌群落的组装机制。随寄主树多样性的增加，附生和内生细菌多样性均增加。然而，更多样化的森林中增加的附生多样性是由单个树木更大的附生多样性（即更大的α‐多样性）驱动的，而更多样化的森林中增加的内生多样性是由树木之间更大的内生组成差异（即更大的β‐多样性）驱动的。在机制上，附生植物对寄主多样性变化的响应与质量效应一致，而内生植物对寄主多样性变化的响应与物种分选一致。合成。这些结果提供了新的实验证据，表明植物物种的生物多样性下降会导致植物相关微生物群的生物多样性下降，但其潜在机制可能因植物寄主栖息地的不同而不同。
Plant microbiomes are known to influence host fitness and ecosystem functioning, but mechanisms regulating their structure are poorly understood. Here, we explored the assembly mechanisms of leaf epiphytic and endophytic bacterial communities using a subtropical forest biodiversity experiment. Both epiphytic and endophytic bacterial diversity increased as host tree diversity increased. However, the increased epiphytic diversity in more diverse forests was driven by greater epiphytic diversity (i.e. greater α‐diversity) on individual trees, whereas the increased endophytic diversity in more diverse forests was driven by greater dissimilarity in endophytic composition (i.e. greater β‐diversity) among trees. Mechanistically, responses of epiphytes to changes in host diversity were consistent with mass effects, whereas responses of endophytes were consistent with species sorting. Synthesis. These results provided novel experimental evidence that biodiversity declines of plant species will lead to biodiversity declines of plant‐associated microbiomes, but the underlying mechanism may differ between habitats on the plant host.