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Soil mutualisms potentially determine the reintroduction outcome of an endangered legume
Restoration Ecology ( IF 3.2 ) Pub Date : 2021-02-18 , DOI: 10.1111/rec.13355
Rachel E. Becknell 1 , Kelli G. Showalter 1 , Matthew A. Albrecht 1, 2 , Scott A. Mangan 3
Affiliation  

Successful recovery of populations of endangered plant species requires conservation of existing populations as well as the creation of new populations through reintroduction. However, the ecological requirements of many rare plant species are poorly understood, and many reintroduced populations are unable to survive long term. Effective reintroduction of rare plants, such as the federally endangered Astragalus bibullatus, may depend on developing a greater understanding of the symbiotic relationships that these rare species form with the soil microbiome, as well as determining whether these are species- and site-specific. We inoculated seedlings of A. bibullatus, its more widespread congener A. tennesseensis, and the common grass Schizachyrium scoparium, with soil biota collected from five glade sites where A. bibullatus is historically present (HP) and four glade sites where the species is historically absent (HA). We examined the impacts of soil microbes from HP and HA glade sites as well as from each species on the growth, arbuscular mycorrhizal fungi (AMF) colonization, and formation of root nodules of A. bibullatus and its congener A. tennesseensis. Astragalus bibullatus grew significantly larger when grown in soil from HP glade sites compared to its growth in soil from HA glade sites. Astragalus bibullatus also formed significantly more root nodules when grown in HP soil, but no difference was detected in AMF colonization based on glade history. Our findings suggest that the successful establishment of rare plant species may depend on species-specific associations with soil mutualists such as nitrogen-fixing rhizobial bacteria and should consider whether essential microbes are present.

中文翻译:

土壤共生可能决定一种濒危豆类的重新引入结果

濒危植物物种种群的成功恢复需要保护现有种群以及通过重新引入创造新种群。然而,许多稀有植物物种的生态需求知之甚少,许多重新引入的种群无法长期生存。稀有植物的有效重新引入,例如联邦濒危的黄芪,可能取决于对这些稀有物种与土壤微生物组形成的共生关系的深入了解,以及确定它们是否具有物种和地点特异性。我们接种了A. bibullatus 的幼苗,其更广泛的同源物A. tennesseensis和普通草。Schizachyrium scoparium,从五个历史上存在A. bibullatus (HP) 的林间空地和四个历史上不存在该物种 (HA) 的林间空地收集土壤生物群。我们研究了来自 HP 和 HA 林间空地以及每个物种的土壤微生物对A. bibullatus及其同源物A. tennesseensis的生长、丛枝菌根真菌 (AMF) 定植和根瘤形成的影响。黄芪在 HP 林地土壤中生长时比在 HA 林间林地土壤中生长时长得多。黄芪在 HP 土壤中生长时也形成了明显更多的根瘤,但根据林间空地的历史,在 AMF 定植中没有检测到差异。我们的研究结果表明,稀有植物物种的成功建立可能取决于与固氮根瘤菌等土壤共生者的物种特异性关联,并应考虑是否存在必需微生物。
更新日期:2021-02-18
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