Journal
MICROBIAL ECOLOGY
Volume 82, Issue 1, Pages 104-121Publisher
SPRINGER
DOI: 10.1007/s00248-020-01557-y
Keywords
Community assembly; Caatinga; Diversity; Glomeromycota; Semiarid
Categories
Funding
- Conselho Nacional de Pesquisas (CNPq) [420.129/2018-9, 307.129/2015-2, 100.900/2018-6]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) [001]
- Fundacao de Apoio a Ciencia e Tecnologia do Estado de Pernambuco (FACEPE) [IBPG-0010-2.03/18, APV-0014-2.03/19]
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The study investigated the composition of AMF communities in the Caatinga region of Brazil and found that soil properties significantly influence the distribution of these organisms, while geological environments and plant hosts also play a role in shaping the structure of AMF communities.
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 ofJatropha mollissima,J. mutabilis, andMimosa 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, andRhizoglomusrepresented 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 ofJ. 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.
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