Ramula Satu, Mousavi Seyed Abdollah, Vesterinen Eero J
Department of Biology University of Turku Turku Finland.
Ecol Evol. 2024 Dec 5;14(12):e70669. doi: 10.1002/ece3.70669. eCollection 2024 Dec.
Plants host microorganisms that can facilitate their success in becoming invasive. Established plant invasions might thus provide useful insights into potential changes in plant-associated microbiomes over the course of the invasion process. Here, we investigated the endophytic bacterial communities of the invasive herbaceous legume , which is able to form mutualistic associations with N-fixing bacteria. More specifically, we examined the alpha diversity (observed bacterial taxa richness and Shannon diversity) and composition of bacterial communities in roots and nodules sampled from core and edge locations within 10 established invasion sites (> 10 years old) in southwestern Finland. Moreover, we compared the alpha diversity and structure of bacterial communities in the rhizosphere and bulk soil between core and edge locations within these invasion sites. We found that roots and nodules had distinctive endophytic bacterial communities, with roots having 24% higher bacterial alpha diversity (Shannon diversity) than nodules. In nodules, the dominant bacteria were assigned to the family , which includes N-fixing bacteria. Soil bacterial communities, instead, were shaped by soil type, with bulk soil hosting up to 27% higher alpha diversity (richness and Shannon diversity) than rhizosphere soil; however, there was no apparent difference in their community composition. Soil bacterial communities were only weakly associated with soil chemistry. Endophytic and soil bacterial communities did not differ between core and edge locations within the established invasions. Our findings suggest that may not induce dramatic changes in the bacterial communities with which it associates over the course of the local invasion process.
植物宿主的微生物能够促进其成功入侵。因此，已形成的植物入侵可能为入侵过程中植物相关微生物群落的潜在变化提供有用的见解。在这里，我们研究了入侵性豆科草本植物的内生细菌群落，该植物能够与固氮细菌形成共生关系。更具体地说，我们检查了从芬兰西南部10个已建立的入侵地点（超过10年）的核心和边缘位置采集的根和根瘤中细菌群落的α多样性（观察到的细菌分类群丰富度和香农多样性）和组成。此外，我们比较了这些入侵地点核心和边缘位置根际和大量土壤中细菌群落的α多样性和结构。我们发现根和根瘤具有独特的内生细菌群落，根的细菌α多样性（香农多样性）比根瘤高24%。在根瘤中，优势细菌被归为 科，其中包括固氮细菌。相反，土壤细菌群落受土壤类型影响，大量土壤的α多样性（丰富度和香农多样性）比根际土壤高27%；然而，它们的群落组成没有明显差异。土壤细菌群落与土壤化学的相关性较弱。在已建立的入侵区域内，核心和边缘位置的内生细菌群落和土壤细菌群落没有差异。我们的研究结果表明， 在当地入侵过程中可能不会对与其相关的细菌群落引起显著变化。
