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Arbuscular mycorrhizal fungi (Glomeromycota) communities in tropical savannas of Roraima, Brazil

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Abstract

Savanna vegetation in the northern region of Brazil is jeopardized by several anthropogenic activities including cattle ranching and extensive agriculture, and soil biota of these ecosystems is virtually unknown. The soils in savannas are poor in nutrients, very acidic, and subject to drought, and under these conditions, arbuscular mycorrhizal fungi (AMF) are likely to play a key role on plant nutrition and improving soil structure. In this study, we surveyed AMF communities in five savanna locations in Roraima state, Northern Brazil. AMF species were identified using two approaches: field collected spores and trap cultures. Twenty-three AMF species were identified, including 21 species in field samples, 8 species in trap cultures, of which 15 and 2 were unique to field and trap culture samples, respectively. Gigaspora margarita, Dentiscutata heterogama, and Glomus sp1 were the most frequent species recovered from all locations. AMF communities were dominated by members of Gigasporaceae that accounted for 50 to 87% of the total species richness within each location. Spore numbers differed across locations and ranged from 5 to 25 spores 100 cm−3 soil. Redundancy analysis indicated that soil organic matter was the only selected predictor among soil parameters and correlated positively with occurrence of Glomus heterosporum. We conclude that savannas in Roraima harbor a high sporulating AMF species richness with communities dominated by members of Gigasporaceae and that organic carbon is an important edaphic factor influencing AMF community composition in this ecosystem.

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Acknowledgements

We would like to thank Andressa Franzoi Sgrott for technical assistance and Chaiane Schoen and Alexandre Uhlmann for helping with the statistical analyses. SLS thanks the CNPq for a Research Assistantship (Process 302343/2012-1).

Funding

This study was funded by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, Grant No. 483.657/2011-5).

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Authors and Affiliations

  1. Departamento de Ciências Naturais, Universidade Regional de Blumenau, Blumenau, SC, 89030-903, Brazil

    Sidney Luiz Stürmer & Karl Kemmelmeier

  2. Colegiado de Engenharia Agronômica, Universidade Federal do Vale do São Francisco, Petrolina, PE, 56300-990, Brazil

    Bruno Coutinho Moreira

  3. Departamento de Microbiologia, Lab de Associações Micorrízicas/BIOAGRO, Universidade Federal de Viçosa, Viçosa, MG, 36570-900, Brazil

    Maria Catarina Megumi Kasuya

  4. Centro de Estudos da Biodiversidade, Universidade Federal de Roraima, Boa Vista, RR, 69304-000, Brazil

    Gilmara Maria Duarte Pereira

  5. Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA), Colombo, PR, 83411-000, Brazil

    Krisle da Silva

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  1. Sidney Luiz Stürmer
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  2. Karl Kemmelmeier
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  3. Bruno Coutinho Moreira
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  4. Maria Catarina Megumi Kasuya
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  5. Gilmara Maria Duarte Pereira
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  6. Krisle da Silva
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Correspondence to Sidney Luiz Stürmer.

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Stürmer, S.L., Kemmelmeier, K., Moreira, B.C. et al. Arbuscular mycorrhizal fungi (Glomeromycota) communities in tropical savannas of Roraima, Brazil. Mycol Progress 17, 1149–1159 (2018). https://doi.org/10.1007/s11557-018-1430-5

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