生活在植物叶片内部或叶片表面的微生物群落受环境线索的影响而形成不同的形态。

IF 5.1 Q1 ECOLOGY
ISME communications Pub Date : 2024-08-08 eCollection Date: 2024-01-01 DOI:10.1093/ismeco/ycae103
Maryam Mahmoudi, Juliana Almario, Katrina Lutap, Kay Nieselt, Eric Kemen
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引用次数: 0

摘要

叶片相关微生物群落可以促进植物健康,增强植物对生物和非生物胁迫的抵抗力。然而,环境线索在叶内微生物群和叶外微生物群的形成过程中的重要性仍然难以捉摸。在这里,我们旨在研究季节性环境变化对建立叶片微生物群的影响,重点是定殖于六个野生拟南芥种群表面和内球的细菌、真菌和非真菌真核生物群落的长期变化(五年)。研究发现,叶片微生物群落具有高度随机性,叶片生态位占据主导地位,内生微生物群落始终表现出较低的多样性和可变性。在环境因素中,辐射和湿度相关因素是叶片多样性模式最重要的驱动因素,对附生群落的影响更大。利用线性模型,我们确定了 30 个重要类属,它们在叶片区的相对丰度可以通过环境变量来模拟,这表明这些类群具有特定的生态位偏好。基于环境因素可能影响微生物群落内部相互作用的假设,我们分析了叶片分区中微生物相互作用网络的季节性模式。我们发现,附生网络比内生网络更复杂,而且这些网络的复杂性和连通性与上述环境线索有部分关联。我们的研究结果表明,湿度和太阳辐射是在微观(叶室)和宏观(地点)尺度上影响叶球微生物群的主要环境因素。这些发现可能对预测和开发适应全球变化的野外微生物具有实际意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Microbial communities living inside plant leaves or on the leaf surface are differently shaped by environmental cues.

Leaf-associated microbial communities can promote plant health and resistance to biotic and abiotic stresses. However, the importance of environmental cues in the assembly of the leaf endo- and epi-microbiota remains elusive. Here, we aimed to investigate the impact of seasonal environmental variations, on the establishment of the leaf microbiome, focusing on long-term changes (five years) in bacterial, fungal, and nonfungal eukaryotic communities colonizing the surface and endosphere of six wild Arabidopsis thaliana populations. While leaf-microbial communities were found to be highly stochastic, the leaf niche had a predominant importance with endophytic microbial communities consistently exhibiting a lower diversity and variability. Among environmental factors, radiation- and humidity-related factors are the most important drivers of diversity patterns in the leaf, with stronger effects on epiphytic communities. Using linear models, we identified 30 important genera whose relative abundance in leaf compartments could be modeled from environmental variables, suggesting specific niche preferences for these taxa. With the hypothesis that environmental factors could impact interactions within microbial communities, we analyzed the seasonal patterns of microbial interaction networks across leaf compartments. We showed that epiphytic networks are more complex than endophytic and that the complexity and connectivity of these networks are partially correlated with the mentioned environmental cues. Our results indicate that humidity and solar radiation function as major environmental cues shaping the phyllosphere microbiome at both micro (leaf compartment) and macro (site) scales. These findings could have practical implications for predicting and developing field-adapted microbes in the face of global change.

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