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Article

The Nexus between Fire and Soil Bacterial Diversity in the African Miombo Woodlands of Niassa Special Reserve, Mozambique

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Forest Research Center, School of Agriculture, University of Lisbon, Tapada da Ajuda, 1349-017 Lisbon, Portugal
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TropiKMan Doctoral Program, NOVA SBE, 2775-405 Carcavelos, Portugal
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Biotechnology Center, Eduardo Mondlane University, Maputo 3453, Mozambique
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National Institute of Agricultural and Veterinary Research, I.P. (INIAV, I.P), 2780-157 Oeiras, Portugal
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Faculty of Agrarian Science, Lúrio University, Niassa 3302, Mozambique
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Faculty of Agronomy and Forest Engineering, Eduardo Mondlane University, Maputo 3453, Mozambique
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Centre for Ecology, Evolution and Environmental Changes (cE3c), Faculty of Sciences, University of Lisbon, 1749-016 Lisbon, Portugal
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Department of Microbiology and Biochemistry, University of the Free State, Bloemfontein 9300, South Africa
*
Authors to whom correspondence should be addressed.
Academic Editor: Francisco Xavier Nascimento
Microorganisms 2021, 9(8), 1562; https://doi.org/10.3390/microorganisms9081562
Received: 23 June 2021 / Revised: 15 July 2021 / Accepted: 19 July 2021 / Published: 22 July 2021
(1) Background: the Miombo woodlands comprise the most important vegetation from southern Africa and are dominated by tree legumes with an ecology highly driven by fires. Here, we report on the characterization of bacterial communities from the rhizosphere of Brachystegia boehmii in different soil types from areas subjected to different regimes. (2) Methods: bacterial communities were identified through Illumina MiSeq sequencing (16S rRNA). Vigna unguiculata was used as a trap to capture nitrogen-fixing bacteria and culture-dependent methods in selective media were used to isolate plant growth promoting bacteria (PGPB). PGP traits were analysed and molecular taxonomy of the purified isolates was performed. (3) Results: Bacterial communities in the Miombo rhizosphere are highly diverse and driven by soil type and fire regime. Independent of the soil or fire regime, the functional diversity was high, and the different consortia maintained the general functions. A diverse pool of diazotrophs was isolated, and included symbiotic (e.g., Mesorhizobium sp., Neorhizobium galegae, Rhizobium sp., and Ensifer adhaerens), and non-symbiotic (e.g., Agrobacterium sp., Burkholderia sp., Cohnella sp., Microvirga sp., Pseudomonas sp., and Stenotrophomonas sp.) bacteria. Several isolates presented cumulative PGP traits. (4) Conclusions: Although the dynamics of bacterial communities from the Miombo rhizosphere is driven by fire, the maintenance of high levels of diversity and functions remain unchanged, constituting a source of promising bacteria in terms of plant-beneficial activities such as mobilization and acquisition of nutrients, mitigation of abiotic stress, and modulation of plant hormone levels. View Full-Text
Keywords: Miombo; fire; 16SrRNA; rhizosphere; plant growth promoting bacteria; Brachystegia boehmii Miombo; fire; 16SrRNA; rhizosphere; plant growth promoting bacteria; Brachystegia boehmii
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MDPI and ACS Style

Maquia, I.S.A.; Fareleira, P.; Videira e. Castro, I.; Soares, R.; Brito, D.R.A.; Mbanze, A.A.; Chaúque, A.; Máguas, C.; Ezeokoli, O.T.; Ribeiro, N.S.; Marques, I.; Ribeiro-Barros, A.I. The Nexus between Fire and Soil Bacterial Diversity in the African Miombo Woodlands of Niassa Special Reserve, Mozambique. Microorganisms 2021, 9, 1562. https://doi.org/10.3390/microorganisms9081562

AMA Style

Maquia ISA, Fareleira P, Videira e. Castro I, Soares R, Brito DRA, Mbanze AA, Chaúque A, Máguas C, Ezeokoli OT, Ribeiro NS, Marques I, Ribeiro-Barros AI. The Nexus between Fire and Soil Bacterial Diversity in the African Miombo Woodlands of Niassa Special Reserve, Mozambique. Microorganisms. 2021; 9(8):1562. https://doi.org/10.3390/microorganisms9081562

Chicago/Turabian Style

Maquia, Ivete Sandra Alberto, Paula Fareleira, Isabel Videira e. Castro, Ricardo Soares, Denise R. A. Brito, Aires Afonso Mbanze, Aniceto Chaúque, Cristina Máguas, Obinna T. Ezeokoli, Natasha Sofia Ribeiro, Isabel Marques, and Ana I. Ribeiro-Barros. 2021. "The Nexus between Fire and Soil Bacterial Diversity in the African Miombo Woodlands of Niassa Special Reserve, Mozambique" Microorganisms 9, no. 8: 1562. https://doi.org/10.3390/microorganisms9081562

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