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Open Access Green as soon as Postprint is submitted to ZB.
Comparison of barley succession and take-all disease as environmental factors shaping the rhizobacterial community during take-all decline.
Appl. Environ. Microbiol. 76, 4703-4712 (2010)
The root disease take-all, caused by Gaeumannomyces graminis var. tritici, can be managed by monoculture-induced take-all decline (TAD). This natural biocontrol mechanism typically occurs after a take-all outbreak and is believed to arise from an enrichment of antagonistic populations in the rhizosphere. However, it is not known whether these changes are induced by the monoculture or by ecological rhizosphere conditions due to a disease outbreak and subsequent attenuation. This question was addressed by comparing the rhizosphere microflora of barley, either inoculated with the pathogen or noninoculated, in a microcosm experiment in five consecutive vegetation cycles. TAD occurred in soil inoculated with the pathogen but not in noninoculated soil. Bacterial community analysis using terminal restriction fragment length polymorphism of 16S rRNA showed pronounced population shifts in the successive vegetation cycles, but pathogen inoculation had little effect. To elucidate rhizobacterial dynamics during TAD development, a 16S rRNA-based taxonomic microarray was used. Actinobacteria were the prevailing indicators in the first vegetation cycle, whereas the third cycle-affected most severely by take-all-was characterized by Proteobacteria, Bacteroidetes, Chloroflexi, Planctomycetes, and Acidobacteria. Indicator taxa for the last cycle (TAD) belonged exclusively to Proteobacteria, including several genera with known biocontrol traits. Our results suggest that TAD involves monoculture-induced enrichment of plant-beneficial taxa.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Antibiosis; Ascomycota/pathogenicity*; Bacteria/classification*; Bacteria/genetics; Bacteria/growth & development; Bacteria/isolation & purification*; Biodiversity*; Cluster Analysis; DNA; Bacterial/chemistry; DNA; Bacterial/genetics; DNA; Ribosomal/chemistry; DNA; Ribosomal/genetics; Hordeum/microbiology*; Microarray Analysis; Phylogeny; Plant Diseases/microbiology*; Plant Roots/microbiology*; RNA; Ribosomal; 16S/genetics; Sequence Analysis; DANN
ISSN (print) / ISBN
0099-2240
e-ISSN
1098-5336
Quellenangaben
Volume: 76,
Issue: 14,
Pages: 4703-4712
Publisher
American Society for Microbiology (ASM)
Reviewing status
Peer reviewed