Characterisation of the Microbiota of Rice Sourdoughs and Description of Lactobacillus spicheri sp. nov

The microbiota of two industrially processed rice sourdoughs was characterised by bacteriological culture in combination with PCR-denaturing gradient gel electrophoresis (DGGE) and 16S/28S rDNA sequence analysis. Rice sourdough I was continuously propagated for several years by back-slopping every w...

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Veröffentlicht in:Systematic and applied microbiology 2004-03, Vol.27 (2), p.151-159
Hauptverfasser: Meroth, Christiane B., Hammes, Walter P., Hertel, Christian
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Hertel, Christian
description The microbiota of two industrially processed rice sourdoughs was characterised by bacteriological culture in combination with PCR-denaturing gradient gel electrophoresis (DGGE) and 16S/28S rDNA sequence analysis. Rice sourdough I was continuously propagated for several years by back-slopping every week, whereas sourdough II was processed by using a commercial starter culture and back-slopping daily for three days. In rice sourdough II Candida krusei and Saccharomyces cerevisiae as well as Lactobacillus fermentum, Lactobacillus gallinarum, Lactobacillus kimchii, Lactobacillus plantarum, and Lactobacillus pontis dominated at the first day of fermentation. RAPD analysis of lactobacilli revealed identical profiles for each of the species except for L. fermentum and L. pontis indicating the presence of different strains. Fluctuations within the LAB community during fermentation were monitored by PCR-DGGE. L. pontis decreased in numbers over time and L. curvatus became dominant after 3 days of fermentation. Rice sourdough I contained S. cerevisiae, Lactobacillus paracasei (present with three different RAPD types), Lactobacillus paralimentarius, and a Lactobacillus strain which could not be allotted to any valid species. Phylogenetic analysis based on 16S rDNA sequences revealed Lactobacillus brevis as the closest relative (97.3% sequence similarity). Differences in some phenotypic characteristics and DNA-DNA relatedness indicated that the strain represents a new Lactobacillus species, for which the name Lactobacillus spicheri is proposed.
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subjects Base Composition
Base Sequence
Biological and medical sciences
Bread - microbiology
Candida krusei
DNA, Bacterial - chemistry
DNA, Bacterial - genetics
Food Microbiology
Fundamental and applied biological sciences. Psychology
lactic acid bacteria
Lactobacillus - classification
Lactobacillus - genetics
Lactobacillus - isolation & purification
Lactobacillus - metabolism
Lactobacillus brevis
Lactobacillus fermentum
Lactobacillus paracasei
Lactobacillus paralimentarius
Lactobacillus pontis
Lactobacillus spicheri
Lactobacillus spicheri sp. nov
Microbiology
Miscellaneous
Molecular Sequence Data
Mycology
Oryza - microbiology
PCR-DGGE
Phylogeny
Random Amplified Polymorphic DNA Technique
Rice sourdough
RNA, Ribosomal, 16S - chemistry
RNA, Ribosomal, 16S - genetics
RNA, Ribosomal, 28S - chemistry
RNA, Ribosomal, 28S - genetics
Saccharomyces cerevisiae
yeasts
title Characterisation of the Microbiota of Rice Sourdoughs and Description of Lactobacillus spicheri sp. nov
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