Abstract
The assessment of bacterial communities in soil gives insight into microbial behavior under prevailing environmental conditions. In this context, we assessed the composition of soil bacterial communities in a Brazilian sugarcane experimental field. The experimental design encompassed plots containing common sugarcane (variety SP80-1842) and its transgenic form (IMI-1 — imazapyr herbicide resistant). Plants were grown in such field plots in a completely randomized design with three treatments, which addressed the factors transgene and imazapyr herbicide application. Soil samples were taken at three developmental stages during plant growth and analyzed using 16S ribosomal RNA (rRNA)-based PCR-denaturing gradient gel electrophoresis (PCR-DGGE) and clone libraries. PCR-DGGE fingerprints obtained for the total bacterial community and specific bacterial groups — Actinobacteria, Alphaproteobacteria and Betaproteobacteria — revealed that the structure of these assemblages did not differ over time and among treatments. Nevertheless, slight differences among 16S rRNA gene clone libraries constructed from each treatment could be observed at particular cut-off levels. Altogether, the libraries encompassed a total of eleven bacterial phyla and the candidate divisions TM7 and OP10. Clone sequences affiliated with the Proteobacteria, Actinobacteria, Firmicutes and Acidobacteria were, in this order, most abundant. Accurate phylogenetic analyses were performed for the phyla Acidobacteria and Verrucomicrobia, revealing the structures of these groups, which are still poorly understood as to their importance for soil functioning and sustainability under agricultural practices.
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Acknowledgements
This work was supported by a grant from FAPESP (Foundation for Research Assistance of São Paulo State, Brazil). We thank FAPESP for the fellowship to W.L.A. (Proc. n° 03/10527-4). We also thank Cristiane C. P. Hardoim for valuable assistance in library construction and Dr. Eugênio César Ulian for conduction and supervision of sugarcane management conditions in field.
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Supplemental Table S1
The table shows Chao1 richness estimations, Shannon-Weaver and Simpson diversity indices for each confidence limits assigned. “Unique”, “species” (99% and 97%), “genus” (95%) and “order” (90%) confidence limits. It was considered 16S rRNA gene sequences for each sugarcane treatment in specific (CV, TC and TH) and sequences altogether (total). (PPT 95 kb)
Supplemental Figure S1
Experimental field design. See Materials and Methods for details. Red “x” represent the two cores of subsamples collected randomly in the middle of each plot. (PPT 117 kb)
Supplemental Figure S2
Cluster analysis of DGGE fingerprints using the unweighted-pair group method for (I) total bacterial community, (II) Actinobacteria, (III) Alphaproteobacteria and (IV) Betaproteobacteria. CV, TC and TH refer to different sugarcane treatments conduced in the field (see material and methods). The numbers 1, 2 and 3 refer to samples collected in three distinct periods of sugarcane cultivation (three, ten and seventeen months, respectively). (PPT 115 kb)
Supplemental Figure S3
LIBSHUFF comparison plots of evolutionary distance by homologous coverage curves (red line) compared to heterologous coverage curve (green line). The blue line indicates the value of delta C (right y axis) for the original samples at each value of evolutionary distance. Purple line indicates the 95% of delta C for the randomized samples. The ranked values (P) of the delta C from the heterologous coverage are shown. (PPT 166 kb)
Supplemental Figure S4
Rarefaction curves of operational taxonomic units (OTU) assigned at the „unique‟, “species” (99% and 97%), “genus” (95%) and “order” (90%) levels for partial bacterial 16S rRNA gene sequences retrieved from sugarcane soil. (a), (b) and (c) refer to CV, TC and TH 16S rRNA group sequence, respectively. (d) refer to altogether sequences considered in the study. The number of OTUs were determined with DOTUR for each case evaluated. (PPT 79 kb)
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Dini-Andreote, F., Andreote, F.D., Costa, R. et al. Bacterial soil community in a Brazilian sugarcane field. Plant Soil 336, 337–349 (2010). https://doi.org/10.1007/s11104-010-0486-z
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DOI: https://doi.org/10.1007/s11104-010-0486-z