Affiliation:
1. National Agricultural Research Organization, National Institute of Livestock and Grassland Science, Nishinasuno-machi, Tochigi-ken 329-2793, Japan
Abstract
ABSTRACT
A total of 161 low-G+C-content gram-positive bacteria isolated from whole-crop paddy rice silage were classified and subjected to phenotypic and genetic analyses. Based on morphological and biochemical characters, these presumptive lactic acid bacterium (LAB) isolates were divided into 10 groups that included members of the genera
Enterococcus
,
Lactobacillus
,
Lactococcus
,
Leuconostoc
,
Pediococcus
, and
Weissella
. Analysis of the 16S ribosomal DNA (rDNA) was used to confirm the presence of the predominant groups indicated by phenotypic analysis and to determine the phylogenetic affiliation of representative strains. The virtually complete 16S rRNA gene was PCR amplified and sequenced. The sequences from the various LAB isolates showed high degrees of similarity to those of the GenBank reference strains (between 98.7 and 99.8%). Phylogenetic trees based on the 16S rDNA sequence displayed high consistency, with nodes supported by high bootstrap values. With the exception of one species, the genetic data was in agreement with the phenotypic identification. The prevalent LAB, predominantly homofermentative (66%), consisted of
Lactobacillus plantarum
(24%),
Lactococcus lactis
(22%),
Leuconostoc pseudomesenteroides
(20%),
Pediococcus acidilactici
(11%),
Lactobacillus brevis
(11%),
Enterococcus faecalis
(7%),
Weissella kimchii
(3%), and
Pediococcus pentosaceus
(2%). The present study, the first to fully document rice-associated LAB, showed a very diverse community of LAB with a relatively high number of species involved in the fermentation process of paddy rice silage. The comprehensive 16S rDNA-based approach to describing LAB community structure was valuable in revealing the large diversity of bacteria inhabiting paddy rice silage and enabling the future design of appropriate inoculants aimed at improving its fermentation quality.
Publisher
American Society for Microbiology
Subject
Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology
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4. Influence of
Lactobacillus
spp. from an Inoculant and of
Weissella
and
Leuconostoc
spp. from Forage Crops on Silage Fermentation
5. Characterization and Identification of
Pediococcus
Species Isolated from Forage Crops and Their Application for Silage Preparation
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