Read e-book online Advances in Microbial Ecology PDF

By Norman R. Pace, David A. Stahl, David J. Lane (auth.), K. C. Marshall (eds.)

ISBN-10: 1475706111

ISBN-13: 9781475706116

ISBN-10: 1475706138

ISBN-13: 9781475706130

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Hybridization of one of the above-mentioned oligonucleotide primers, complementary to all 16S genes so far as we know, provides an estimate of total rDNA present. The specific/total rDNA ratio really is only an approximate estimate of relative cell numbers, since rRNA gene copy numbers vary in different organisms. The inspected archaebacteria, for instance, have single copies of the rRNA genes; eubacteria commonly have 5-10 rDNA copies; and eucaryotes may have hundreds. Nonetheless, the amount of a specific rDNA in a mixed population likely reflects the contribution of that organism to the local metabolic potential.

16S rRNA nucleotide sequences therefore must not be considered as single-marker comparisons, but as comparisons using numerous functional domains. This would be analogous to comparisons simultaneously using amino acid sequences of several different proteins from the same metabolic pathway. 30 N. R. Pace et al. Although there is substantial variation in homologous stretches of compared 16S rRNAs, the distribution of changes is not random. Some segments are perfectly conserved, or nearly so, while others drift freely.

The traditional microbial taxonomic hierarchies based on autotrophy and heterotrophy appear to correlate poorly with phylogenetic associations. Also, our and other analyses indicate that many organisms classified as Pseudomonas spp. _IDeinoc occu!! 0 ' ' THE EUBACTERIA Th•obacdtus thiooxrdans ATCC 8085 Thtobacillus ferroox•dans ATCC 19859 Paracoccus Rhodosp~rillum Thermus thermoph1lus den•tr•hcans~ rubrum Th•obac•llus novellus Group I Thermus aQuahcus Octopus SPri1g 2 Octopus spring 3 Pseudomonas d•mmura Figure 5.

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Advances in Microbial Ecology by Norman R. Pace, David A. Stahl, David J. Lane (auth.), K. C. Marshall (eds.)


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