Programa de Pós-Graduacao em Biologia de Fungos, Universidade Federal de Pernambuco, Av. da Engenharia, s/n, Cidade Universitaria, Recife, PE, 50740-600, Brazil.
Agroscope, Competence Division for Plants and Plant Products, Ecotoxicology, Müller-Thurgau-Strasse 29, CH-8820, Wädenswil, Switzerland.
Microb Ecol. 2021 Jul;82(1):104-121. doi: 10.1007/s00248-020-01557-y. Epub 2020 Aug 6.
The Brazilian dry forest (Caatinga) is located in one of the world's largest tropical semiarid regions, and it occurs on two large geological environments named the crystalline and sedimentary basins. In order to determine the structure and the main drivers of the composition of communities of arbuscular mycorrhizal fungi (AMF) in the Caatinga, we collected soil samples from the rhizosphere of Jatropha mollissima, J. mutabilis, and Mimosa tenuiflora, species that occur in crystalline and sedimentary areas. Ninety-six AMF taxa were identified from soils collected directly in the field and trap cultures. Acaulospora, Glomus, and Rhizoglomus represented almost 49% of the taxon richness. The composition of the AMF communities differed between the crystalline and sedimentary areas and between the rhizospheres of the three plant species. Coarse sand, total sand, natural clay, calcium, soil particles density, flocculation, pH, and base saturation were the principal edaphic variables related to the distribution of these organisms. We registered nine and 17 AMF species classified as indicators, for the geological environments and plant species, respectively. Glomerospores of Glomerales predominated in crystalline basins, whereas glomerospores of Gigasporales prevailed in sedimentary areas; among the plant species, lower number of glomerospores of Archaeosporales and Glomerales was recorded in the rhizosphere of J. mollissima. The results show that the AMF community composition is shaped by geological environments and plant hosts. In addition, soil characteristics, mainly physical attributes, significantly influence the structure of Glomeromycota communities occurring in areas of the Brazilian semiarid.
巴西干旱森林（Caatinga）位于世界上最大的热带半干旱地区之一，分布在两个名为结晶盆地和沉积盆地的大型地质环境中。为了确定 Caatinga 中丛枝菌根真菌（AMF）群落的结构和主要驱动因素，我们从结晶区和沉积区的 Jatropha mollissima、J. mutabilis 和 Mimosa tenuiflora 植物根际中采集土壤样本。从现场直接采集的土壤和陷阱培养物中鉴定出了 96 种 AMF 类群。无梗囊霉属、球囊霉属和根内球囊霉属几乎占分类丰富度的 49%。AMF 群落的组成在结晶区和沉积区以及三种植物的根际之间存在差异。粗砂、总砂、天然粘土、钙、土壤颗粒密度、絮凝、pH 值和基础饱和度是与这些生物分布相关的主要土壤变量。我们记录了 9 种和 17 种 AMF 物种，分别为地质环境和植物物种的指示物种。Glomerales 的 Glomerospores 在结晶盆地中占优势，而 Gigasporales 的 Glomerospores 在沉积区中占优势；在植物物种中，J. mollissima 根际中记录的 Archaeosporales 和 Glomerales 的 Glomerospores 数量较少。结果表明，AMF 群落组成受地质环境和植物宿主的影响。此外，土壤特性，主要是物理属性，显著影响巴西半干旱地区发生的球囊霉科群落的结构。
