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Bacterial communities in soils as indicators of the potential of syenite as an agromineral

Lookup NU author(s): Dr Joana Baptista, Emeritus Professor Neil Gray, Professor Ian Singleton, Dr Clare McCannORCiD, Professor David ManningORCiD



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


The objective of this work was to identify microbial communities associated with the surfaces of alkali feldspars and to determine whether these microbes might be involved in the weathering of these rocks for agronomic benefit. Samples were taken from weathering profiles and soils developed on a syenite, considered as a raw material for agromineral production, located in the municipality of Triunfo, in the state of Pernambuco, Brazil. Molecular microbiological techniques (qPCR and 16S rRNA gene sequencing) were used, and data were interpreted by the analysis of variance, hierarchical cluster analysis, and principal coordinates analysis. In addition, scanning electron microscopy was used to image mineral surfaces. Similar bacterial communities were observed in all samples, showing that the bacteria found in soil are present at the earliest stages of rock weathering and are available to play a role in nutrient release. In particular, Actinobacteria and, within this phylum, Actinomycetales were proportionally more abundant than other taxa in rock-dominated soil samples, i.e., in thin soils on or between fractured or broken syenite. The analysis of rock dust used as a remineralizer, crushed with no further treatment, shows that Actinobacteria play a role in the early stages of weathering of feldspar-bearing rocks.

Publication metadata

Author(s): Baptista JdeC, Gray ND, Tarumoto MB, Singleton I, McCann CM, Manning DAC

Publication type: Article

Publication status: Published

Journal: Pesquisa Agropecuária Brasileira (Brazilian Journal of Agricultural Research)

Year: 2022

Volume: 57

Online publication date: 28/03/2022

Acceptance date: 04/02/2021

Date deposited: 31/03/2022

ISSN (print): 0100-204X

ISSN (electronic): 1678-3921

Publisher: EMBRAPA


DOI: 10.1590/S1678-3921.pab2022.v57.01414


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Funder referenceFunder name
Terrativa Minerais S.A.