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Successional Trajectories of Rhizosphere Bacterial Communities over Consecutive Seasons.

Shi S, Nuccio E, Herman DJ, Rijkers R, Estera K, Li J, da Rocha UN, He Z, Pett-Ridge J, Brodie EL, Zhou J, Firestone M - MBio (2015)

Bottom Line: Succession in the rhizosphere was characterized by a significant decrease in both taxonomic and phylogenetic diversity relative to background soil communities, driven by reductions in both richness and evenness of the bacterial communities.Plant roots selectively stimulated the relative abundance of Alphaproteobacteria, Betaproteobacteria, and Bacteroidetes but reduced the abundance of Acidobacteria, Actinobacteria, and Firmicutes.The reproducibility of rhizosphere succession and the apparent phylogenetic conservation of rhizosphere competence traits suggest adaptation of the indigenous bacterial community to this common grass over the many decades of its presence.

View Article: PubMed Central - PubMed

Affiliation: Department of Environmental Science, Policy and Management, University of California, Berkeley, California, USA Department of Microbiology and Plant Biology, Institute for Environmental Genomics, University of Oklahoma, Norman, Oklahoma, USA.

No MeSH data available.


Abundance of bacterial 16S rRNA genes in bulk and rhizosphere soils associated with A. fatua at different growth stages in season 1 (a) and season 2 (b). Data are presented as means ± standard errors (n = 16). ANOVA P values are shown in the figure.
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fig4: Abundance of bacterial 16S rRNA genes in bulk and rhizosphere soils associated with A. fatua at different growth stages in season 1 (a) and season 2 (b). Data are presented as means ± standard errors (n = 16). ANOVA P values are shown in the figure.

Mentions: In both seasons, bacterial 16S rRNA gene abundance (measured by qPCR) in rhizosphere soil gradually increased over time beginning at week 3 (P < 0.05 [Fig. 4]). 16S rRNA gene abundance was significantly higher in rhizosphere soils than in bulk/residual soil beginning at week 6 for season 1 and week 3 for season 2. In the bulk/residual soil, seasonal patterns were also quite consistent; bacterial 16S rRNA gene abundance decreased from week 0 to weeks 3 and 6 (P < 0.05), followed by a slight increase (Fig. 4).


Successional Trajectories of Rhizosphere Bacterial Communities over Consecutive Seasons.

Shi S, Nuccio E, Herman DJ, Rijkers R, Estera K, Li J, da Rocha UN, He Z, Pett-Ridge J, Brodie EL, Zhou J, Firestone M - MBio (2015)

Abundance of bacterial 16S rRNA genes in bulk and rhizosphere soils associated with A. fatua at different growth stages in season 1 (a) and season 2 (b). Data are presented as means ± standard errors (n = 16). ANOVA P values are shown in the figure.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4526712&req=5

fig4: Abundance of bacterial 16S rRNA genes in bulk and rhizosphere soils associated with A. fatua at different growth stages in season 1 (a) and season 2 (b). Data are presented as means ± standard errors (n = 16). ANOVA P values are shown in the figure.
Mentions: In both seasons, bacterial 16S rRNA gene abundance (measured by qPCR) in rhizosphere soil gradually increased over time beginning at week 3 (P < 0.05 [Fig. 4]). 16S rRNA gene abundance was significantly higher in rhizosphere soils than in bulk/residual soil beginning at week 6 for season 1 and week 3 for season 2. In the bulk/residual soil, seasonal patterns were also quite consistent; bacterial 16S rRNA gene abundance decreased from week 0 to weeks 3 and 6 (P < 0.05), followed by a slight increase (Fig. 4).

Bottom Line: Succession in the rhizosphere was characterized by a significant decrease in both taxonomic and phylogenetic diversity relative to background soil communities, driven by reductions in both richness and evenness of the bacterial communities.Plant roots selectively stimulated the relative abundance of Alphaproteobacteria, Betaproteobacteria, and Bacteroidetes but reduced the abundance of Acidobacteria, Actinobacteria, and Firmicutes.The reproducibility of rhizosphere succession and the apparent phylogenetic conservation of rhizosphere competence traits suggest adaptation of the indigenous bacterial community to this common grass over the many decades of its presence.

View Article: PubMed Central - PubMed

Affiliation: Department of Environmental Science, Policy and Management, University of California, Berkeley, California, USA Department of Microbiology and Plant Biology, Institute for Environmental Genomics, University of Oklahoma, Norman, Oklahoma, USA.

No MeSH data available.