How plant-associated microbiota are shaped by, and potentially contribute to, the unique ecology and heterotrophic life history of parasitic plants is relatively unknown. Here, we investigate the leaf and root bacterial communities of the root holoparasite Orobanche hederae and its host Hedera spp. from natural populations. Root bacteria inhabiting Orobanche were less diverse, had fewer co-associations, and displayed increased compositional similarity to leaf bacteria relative to Hedera. Overall, Orobanche bacteria exhibited significant congruency with Hedera root bacteria across sites, but not the surrounding soil. Infection had localized and systemic effects on Hedera bacteria, which included effects on the abundance of individual taxa and root network properties. Collectively, our results indicate that the parasitic plant microbiome is derived but distinct from the host plant microbiota, exhibits increased homogenization between shoot and root tissues, and displays far fewer co-associations among individual bacterial members. Host plant infection is accompanied by modest changes of associated microbiota at both local and systemic scales compared with uninfected individuals. Our results are a first step towards extending the growing insight into the assembly and function of the plant microbiome to include the ecologically unique but often overlooked guild of heterotrophic plants.

中文翻译：

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寄生植物及其宿主中独特的细菌装配，组成和相互作用。

相对未知寄生植物独特的生态学和异养生活史如何影响植物相关微生物群，以及如何对其做出贡献。在这里，我们调查根部全寄生的Orobanche hederae及其宿主Hedera spp的叶和根细菌群落。来自自然种群。相对于Hedera，居住在Orobanche的根细菌多样性较低，共缔合较少，并且与叶细菌的组成相似性增加。总体而言，Orobanche细菌与Hedera根细菌在各个部位均表现出显着的一致性，但在周围土壤中却没有。感染对常春藤属细菌具有局部和全身性影响，其中包括对单个类群的丰度和根网络特性的影响。总的来说，我们的结果表明，寄生植物微生物组是衍生的，但不同于寄主植物微生物区系，在茎和根组织之间显示出更高的均质性，并且在单个细菌成员之间显示出更少的共缔合。与未感染的个体相比，宿主植物感染伴随着局部和系统规模的相关微生物群的适度变化。我们的研究结果是朝着将日益增长的洞察力扩展到植物微生物组的组装和功能迈出第一步的一步，以涵盖异养植物在生态学上独特但经常被忽视的行会。与未感染的个体相比，宿主植物感染伴随着局部和系统规模的相关微生物群的适度变化。我们的结果是朝着将日益增长的洞察力扩展到植物微生物组的组装和功能迈进第一步的一步，其中包括异养植物在生态学上独特但经常被忽视的行会。与未感染的个体相比，宿主植物感染伴随着局部和系统规模的相关微生物群的适度变化。我们的研究结果是朝着将日益增长的洞察力扩展到植物微生物组的组装和功能迈出第一步的一步，其中包括异养植物在生态学上独特但经常被忽视的行会。