High abundance of planctomycetes in anoxic layers of a Sphagnum peat bog

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• 作者：A. O. Ivanova and S. N. Dedysh
• 关键词：the phylum Planctomycetes ; anaerobic planctomycetes ; Sphagnum peat bogs ; fluorescence in situ hybridization
• 刊名：Microbiology
• 出版年：2006
• 出版时间：December, 2006
• 年：2006
• 卷：75
• 期：6
• 页码：716-719
• 全文大小：166 KB
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Microbiology
  Medical Microbiology
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1608-3237

文摘

The depth distribution of planctomycete abundance has been examined in six different sites of the Sphagnum peat bog Bakchar, Tomsk oblast, Russia. In situ hybridization of peat with the fluorescently labeled oligonucleotide probes PLA46 and PLA886, reported to be group-specific for representatives of the phylum Planctomycetes, revealed two distinct population maxima of these bacteria in all of the profiles examined. The first population maximum was detected in the uppermost, oxic layer of the bog profile, while the second maximum was located at a depth of 30 cm below the water table level. The population sizes of planctomycetes in the uppermost layer and at a depth of 30 cm were of the same order of magnitude and comprised 0.5–1.5 × 107 and 0.4?0.7 × 107 cells per g?1 of wet peat, respectively. Only 25–30% of the total number of planctomycete cells in the anoxic layer could be detected if the probe PLA886, whose target specificity is restricted to taxonomically characterized aerobic planctomycetes of the genera Gemmata, Planctomyces, Pirellula, and Isosphaera, was used alone. Other planctomycete cells in this layer were detected only with the probe PLA46, which possesses a much wider scope. This suggests the affiliation of these organisms with a yet undescribed phylogenetic subgroup within the Planctomycetes.