Abstract
Tropical dry forests are strongly affected by seasonality, but its effects on belowground communities are poorly studied. Thus, the objective of this study was to reveal the effect of the season (dry versus wet) on the mycorrhizal status of roots and their potential colonization, and to determine the composition and abundance of spore-based communities of arbuscular mycorrhizal fungi (AMF) in rhizospheric soil of two dominant woody species in caatinga communities (tropical dry forest of the Brazilian Northeast). Soil and root samples were taken four times in each season (dry and wet). In the cases of the number of glomerospores and the number of infective propagules of AMF, there were significant differences between the hosts, with greater values observed in the rhizosphere of Commiphora leptophloeos than Mimosa tenuiflora. Mycorrhizal colonization and the number of infective propagules of AMF differed also between the seasons, being higher in the dry than the wet season. In total, fourteen AMF species were found in the rhizosphere of C. leptophloeos and twelve species were associated with M. tenuiflora. There was a predominance of the fungal genus Acaulospora, with seven species, followed by Gigaspora and Glomus. The species studied and the seasons differ in the composition and structure of the AMF community in the rhizosphere of the plants. The ecological significance of those differences needs to be examined further.
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Acknowledgements
The authors acknowledge the ‘Fundação de Amparo à Ciência e Tecnologia de Pernambuco’ (FACEPE) for a master's scholarship provided to T. Teixeira-Rios and grants support to A.M.Yano-Melo, and to Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for a scholarship provided to D.K.A. Silva and grant awarded to A.M. Yano-Melo and B.T. Goto. The authors also wish to thank the Embrapa Semiárido for the analyses of plant and soil nutrient content and to the Microbiology Laboratory team of Univasf/CCA.
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Teixeira-Rios, T., da Silva, D.K.A., Goto, B.T. et al. Seasonal differences in arbuscular mycorrhizal fungal communities in two woody species dominating semiarid caatinga forests. Folia Geobot 53, 191–200 (2018). https://doi.org/10.1007/s12224-018-9314-7
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DOI: https://doi.org/10.1007/s12224-018-9314-7