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The influence of land use intensity on the plant-associated microbiome of Dactylis glomerata L.
Front. Plant Sci. 8:930 (2017)
In this study, we investigated the impact of different land use intensities (LUI) on the root-associated microbiome of Dactylis glomerata (orchardgrass). For this purpose, eight sampling sites with different land use intensity levels but comparable soil properties were selected in the southwest of Germany. Experimental plots covered land use levels from natural grassland up to intensively managed meadows. We used 16S rRNA gene based barcoding to assess the plant-associated community structure in the endosphere, rhizosphere and bulk soil of D. glomerata. Samples were taken at the reproductive stage of the plant in early summer. Our data indicated that roots harbor a distinct bacterial community, which clearly differed from the microbiome of the rhizosphere and bulk soil. Our results revealed Pseudomonadaceae, Enterobacteriaceae and Comamonadaceae as the most abundant endophytes independently of land use intensity. Rhizosphere and bulk soil were dominated also by Proteobacteria, but the most abundant families differed from those obtained from root samples. In the soil, the effect of land use intensity was more pronounced compared to root endophytes leading to a clearly distinct pattern of bacterial communities under different LUI from rhizosphere and bulk soil vs. endophytes. Overall, a change of community structure on the plant–soil interface was observed, as the number of shared OTUs between all three compartments investigated increased with decreasing land use intensity. Thus, our findings suggest a stronger interaction of the plant with its surrounding soil under low land use intensity. Furthermore, the amount and quality of available nitrogen was identified as a major driver for shifts in the microbiome structure in all compartments.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Biodiversity ; Dactylis Glomerata ; Endophytes ; Land Use Change ; Rhizosphere ; Soil Microbiome; Phenotypic Plasticity; Bacterial Communities; Species Composition; Root Microbiomes; Growth Promotion; Soil Type; Rhizosphere; Colonization; Germination; Grasslands
ISSN (print) / ISBN
1664-462X
e-ISSN
1664-462X
Journal
Frontiers in Plant Science
Quellenangaben
Volume: 8,
Article Number: 930
Publisher
Frontiers
Publishing Place
Lausanne
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Research Unit Comparative Microbiome Analysis (COMI)