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Differences in bacterial diversity, Composition and function due to long-term agriculture in soils in the Eastern Free State of South Africa

AuthorsDube, Joel P.; Valverde Portal, Ángel ; Steyn, Joachim M.; Cowan, Don A.; Van der Waals, Jacqueline E.
KeywordsBacterial diversity
Bacterial function
High-throughput 16S rRNA gene sequencing
Issue Date2019
PublisherMultidisciplinary Digital Publishing Institute
CitationDiversity 11(4): 61 (2019)
AbstractLand-use change from natural to managed agricultural ecosystems significantly impacts soil bacterial diversity and function. The Eastern Free State (EFS) is one of the most productive agricultural regions in South Africa. However, no studies aiming to understand the changes in bacterialdiversity,compositionandfunctionduetoland-usechangeinthisareahavebeenconducted. This study investigated, using high-throughput 16S rRNA gene amplicon sequencing, the effects of long-term agriculture on bacterial diversity, composition and putative function in the EFS by comparing microbiomes from lands that have been under agronomic activity for over 50 years to those from uncultivated land. Results indicate that agriculture increased bacterial diversity. Soil chemical analysis showed that land-use shifted soils from being oligotrophic to copiotrophic, whichchangedbacterialcommunitiesfrombeingActinobacteriadominatedtoProteobacteriadominated. Predictive functional analysis using Phylogenetic Investigation of Communities by Reconstruction of Unobserved States (PICRUSt) suggested that agricultural soil was abundant in genes associated with plant fitness and plant growth promotion, while non-agricultural soil was abundant in genes related to organic matter degradation. Together, these results suggest that edaphic factors induced by long-term agriculture resulted in shifts in bacterial diversity and putative function in the EFS.
Description16 páginas, 6 figuras, 2 tablas
Publisher version (URL)http://dx.doi.org/10.3390/d11040061
Appears in Collections:(IRNASA) Artículos
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