Abstract：
:Prokaryote diversity in the rumen of yak (Bos grunniens) and Jinnan cattle (Bos taurus) was estimated by 16S rDNA homology analysis. Two rumen 16S rDNA libraries were constructed. Of the 194 clones in the library of yak rumen, the sequences were mainly clustered to two phyla, low G+C Gram-positive bacteria (LGCGPB, 54.12% total clones) and Bacteroidetes (30.93%), respectively. While in the 197 clone-library of the cattle rumen, the sequences were mainly related to three phyla, Bacteroidetes (39.59%), gamma-Proteobacteria (26.9%) and LGCGPB (22.34%), respectively. The sequence analysis indicated that more than half of the species harbored in yak rumen belonged to the not-yet-cultured groups at <90% 16S rDNA similarity levels with cultured species, while 36% 16S rDNA sequences amplified from the rumen of Jinnan cattle fell in these catalogues. By comparing the uncultured sequences in yak rumen with those in Jinnan cattle and cow, the former formed distinct clusters loosely related to the later, implying that yak rumen could harbor some special prokaryote phyla. 10.8% sequences retrieved in yak rumen were related to the known rumen fibrolytic bacterial species; however none was related to the known amylolysis species. While 4% and 17.8% sequences retrieved from Jinnan cattle rumen were related to cultured fibrolytic and amylolysis species, respectively. The bacterial structures seemed to be in accordance with the feed of the two kinds of animals. In both rumens, retrieved methanogenic Archaea-related 16S rDNA sequences were at an unreasonable low level; in addition, none sequence was related to Ruminococcus albus, a classical rumen fibrolytic species. The reason can be due to the experimental biases.
journal_name
Anaerobejournal_title
Anaerobeauthors
An D,Dong X,Dong Zdoi
10.1016/j.anaerobe.2005.02.001subject
Has Abstractpub_date
2005-08-01 00:00:00pages
207-15issue
4eissn
1075-9964issn
1095-8274pii
S1075-9964(05)00024-7journal_volume
11pub_type
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