Chemoautotrophic, sulfur-oxidizing symbiotic bacteria on marine nematodes: Morphological and biochemical characterization

Citation:
Polz, MF, Felbeck H, Novak R, Nebelsick M, Ott JA.  1992.  Chemoautotrophic, sulfur-oxidizing symbiotic bacteria on marine nematodes: Morphological and biochemical characterization. Microbial Ecology. 24:313-329.

Keywords:

beggiatoa-alba, ecology, electron-microscopy, elemental sulfur, invertebrates, microorganisms, phallodrilus-leukodermatus, riftia-pachyptila jones, sulfide-rich habitats, vent tube worm

Abstract:

The marine, free-living Stilbonematinae (Nematoda: Desmodorida) inhabit the oxygen sulfide chemocline in marine sands. They are characterized by an association with ectosymbiotic bacteria. According to their ultrastructure the bacteria are Gram-negative and form morphologically uniform coats that cover the entire body surface of the worms. They are arranged in host-genus or host-species specific patterns: cocci form multilayered sheaths, rods, and crescent- or filament-shaped bacteria form monolayers. The detection of enzymes associated with sulfur metabolism and of ribulose- 1,5 bisphosphate carboxylase oxygenase, as well as elemental sulfur in the bacteria indicate a chemolithoautotrophic nature of the symbionts. Their reproductive patterns appear to optimize space utilization on the host surface: vertically standing rods divide by longitudinal fission, whereas other bacteria form nonseptate filaments of up to 100 mum length.

Notes:

n/a

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DOI:

10.1007/bf00167789