Characterization of Tannin-tolerant Bacterial Isolates from East African Ruminants
Date
2000-06Author
Odenyoa, Agnes A.
Bishopb, Richard
Asefaa, Genet
Jamnadassb, Ramni
Odongob, David
Osujia, Paschal
Language
enMetadata
Show full item recordAbstract
Several tannin-tolerant bacteria were isolated from enrichment cultures of rumen microflora of bush duiker, giraffe, Grant's gazelle, sheep, and goat, and established in medium containing crude tannin extracts or tannic acid. The isolates were characterized by classical and molecular methods. The isolates were also tested for the presence of tannin acylhydrolase. Characterization by restriction fragment length polymorphism of the 16S rRNA–PCR product was performed withAlu 1, Dde 1, Msp 1, and Taq 1. Amplified fragment length polymorphism analysis was performed only on the isolates that were curved rods. The nucleotide sequence of PCR products derived from the 16S rRNA genes of the isolates was determined. The classical characterization suggested that, with one exception all the curved rods isolates wereSelenomonas and the coccus was a Streptococcus. Only Selenomonas -like isolates had tannin acylhydrolase activities. One isolate lost the ability to completely hydrolyze tannins after prolonged storage at −70°C. The restriction fragment length polymorphism profiles suggested that the Selenomonas -like isolates exhibited heterogeneity in the ribosomal RNA locus. The coccus had the same profiles as Streptococcus caprinus, while the straight rods appeared to be similar to each other. Amplified fragment length polymorphism analysis suggested that the Selenomonas -like isolates clustered into two major groups. The 16S rRNA sequences of the coccus clustered with that ofStreptococcus species and the Selenomonas -like isolates exhibited a high level of similarity withSelenomonas ruminantium , while the straight rods clustered with Klebsiella species accessions in the databases. A partial 16S sequence strongly indicated that one of the isolates was Butyrivibrio fibrisolvens.
Publisher
University of Nairobi