• Root traits respond to drought in a species-specific manner, but little is known about how soil fungal communities and root traits respond to drought in concert.
• In a glasshouse experiment, we determined the response of soil pathogens, saprotrophs, and mutualistic and all fungi associated with the roots of 24 plant species subjected to drought. At harvest, soil fungal communities were characterized by sequencing. Data on root traits were extracted from a previously published work.
• Differences in fungal beta diversity between drought and control were plant species specific. For some species, saprotrophic fungi increased in relative abundance and richness with drought, whereas mutualistic fungi showed the opposite pattern. Community structure of pathogenic fungi was plant species specific but was slightly affected by drought.
• Pathogen composition was correlated with specific root surface area and root : shoot, saprotroph abundance with root tissue density, whereas mutualist composition was correlated with root : shoot. All these were the fungal attributes that best predicted shoot mass.
• Fungal response to drought depended highly on the fungal group and was related to root trait adjustments to water scarcity. This provides new insights into the role that root trait adjustments to drought may have in modulating plant–fungus interactions in grasslands ecosystems.

中文翻译：

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干旱导致土壤真菌群落发生变化，这与 24 种植物的根系特性有关

• 根性状以特定于物种的方式对干旱作出反应，但对于土壤真菌群落和根性状如何协同应对干旱知之甚少。
• 在温室实验中，我们确定了土壤病原体、腐生菌、共生菌以及与 24 种遭受干旱的植物根系相关的所有真菌的反应。在收获时，土壤真菌群落的特征是测序。有关根性状的数据是从先前发表的作品中提取的。
• 干旱和对照之间真菌β多样性的差异是植物物种特异性的。对于某些物种，腐生真菌的相对丰度和丰富度随着干旱而增加，而共生真菌则表现出相反的模式。病原真菌群落结构具有植物物种特异性，但受干旱影响较小。
• 病原体组成与比根表面积和根：芽、腐生菌丰度与根组织密度相关，而共生成分与根：芽相关。所有这些都是最能预测枝条质量的真菌属性。
• 真菌对干旱的反应高度依赖于真菌组，并且与根系对缺水的性状调整有关。这提供了对干旱的根性状调整可能在调节草原生态系统中植物-真菌相互作用中的作用的新见解。