Shifts in the bacterial community composition along deep soil profiles in monospecific and mixed stands of Eucalyptus grandis and Acacia mangium

Our knowledge of the rhizosphere bacterial communities in deep soils and the role of Eucalyptus and Acacia on the structure of these communities remains very limited. In this study, we targeted the bacterial community along a depth profile (0 to 800 cm) and compared community structure in monospecif...

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Bibliographic Details
Published in:PloS one 2017-07, Vol.12 (7), p.e0180371-e0180371
Main Authors: Pereira, Arthur Prudêncio de Araujo, Andrade, Pedro Avelino Maia de, Bini, Daniel, Durrer, Ademir, Robin, Agnès, Bouillet, Jean Pierre, Andreote, Fernando Dini, Cardoso, Elke Jurandy Bran Nogueira
Format: Article
Language:English
Subjects:
Abundance
Acacia - physiology
Acacias (Plants)
Acidobacteria - classification
Acidobacteria - genetics
Acidobacteria - isolation & purification
Agriculture
Bacteria
Biology and Life Sciences
Brazil
Carbon
Communities
Community composition
Community structure
Conservation of Natural Resources
Cultivation
Depth profiling
Differentiation
DNA, Bacterial - genetics
Ecology
Ecology and Environmental Sciences
Ecosystems
Eucalyptus
Eucalyptus - physiology
Firmicutes - classification
Firmicutes - genetics
Firmicutes - isolation & purification
Flowers & plants
Microbial Consortia - physiology
Microbiology
Microorganisms
Physiological aspects
Plant communities
Plantations
Polymerase chain reaction
Proteobacteria - classification
Proteobacteria - genetics
Proteobacteria - isolation & purification
Rhizosphere
RNA, Ribosomal, 16S - genetics
rRNA 16S
Science
Soil - chemistry
Soil depth
Soil improvement
Soil Microbiology
Soil microorganisms
Soil profiles
Soil properties
Soil sciences
Soils
Trees - physiology
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Summary:Our knowledge of the rhizosphere bacterial communities in deep soils and the role of Eucalyptus and Acacia on the structure of these communities remains very limited. In this study, we targeted the bacterial community along a depth profile (0 to 800 cm) and compared community structure in monospecific or mixed plantations of Acacia mangium and Eucalyptus grandis. We applied quantitative PCR (qPCR) and sequence the V6 region of the 16S rRNA gene to characterize composition of bacterial communities. We identified a decrease in bacterial abundance with soil depth, and differences in community patterns between monospecific and mixed cultivations. Sequence analysis indicated a prevalent effect of soil depth on bacterial communities in the mixed plant cultivation system, and a remarkable differentiation of bacterial communities in areas solely cultivated with Eucalyptus. The groups most influenced by soil depth were Proteobacteria and Acidobacteria (more frequent in samples between 0 and 300 cm). The predominant bacterial groups differentially displayed in the monospecific stands of Eucalyptus were Firmicutes and Proteobacteria. Our results suggest that the addition of an N2-fixing tree in a monospecific cultivation system modulates bacterial community composition even at a great depth. We conclude that co-cultivation systems may represent a key strategy to improve soil resources and to establish more sustainable cultivation of Eucalyptus in Brazil.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0180371