Metagenomic assessment of the potential microbial nitrogen pathways in the rhizosphere of a mediterranean forest after a wildfire

Microbial Ecology
José F Cobo-DíazManuel Fernández-López

Abstract

Wildfires are frequent in the forests of the Mediterranean Basin and have greatly influenced this ecosystem. Changes to the physical and chemical properties of the soil, due to fire and post-fire conditions, result in alterations of both the bacterial communities and the nitrogen cycle. We explored the effects of a holm oak forest wildfire on the rhizospheric bacterial communities involved in the nitrogen cycle. Metagenomic data of the genes involved in the nitrogen cycle showed that both the undisturbed and burned rhizospheres had a conservative nitrogen cycle with a larger number of sequences related to the nitrogen incorporation pathways and a lower number for nitrogen output. However, the burned rhizosphere showed a statistically significant increase in the number of sequences for nitrogen incorporation (allantoin utilization and nitrogen fixation) and a significantly lower number of sequences for denitrification and dissimilatory nitrite reductase subsystems, possibly in order to compensate for nitrogen loss from the soil after burning. The genetic potential for nitrogen incorporation into the ecosystem was assessed through the diversity of the nitrogenase reductase enzyme, which is encoded by the nifH gene. We found that ...Continue Reading

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Citations

Aug 2, 2015·Applied and Environmental Microbiology·Michaeline B NelsonJennifer B H Martiny
Jul 22, 2017·Scientific Reports·Antonio J Fernández-GonzálezManuel Fernández-López
Mar 17, 2018·Genome Announcements·Antonio J Fernández-GonzálezManuel Fernández-López
Jul 11, 2021·Current Microbiology·Angel A Becerra-LucioYuri J Peña-Ramírez
Oct 4, 2021·Environmental Science and Pollution Research International·Lucas Conceição de Souza, Luciano Procópio

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