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Bacterial symbionts on green hydra and their effect on phosphate uptake
Authors:Frances P Wilkerson
Institution:(1) Botany Department, Bristol University, Bristol, England
Abstract:Gram-negative rod-shaped bacteria (1.5–2mgrm long and 0.5mgrm wide) have been found associated with green hydra. They are always present on the hydra surface delineating the ectodermal cells, on animals in culture, and also on those sampled from a natural habitat. The bacteria could be removed by a 30-min treatment with antibiotics (50mgr/ml polymyxin B and 50mgr/ml streptomycin). Antibiotic-treated hydra took up 55% less phosphate from the medium than control hydra. The nutritional relationship between the bacteria and green hydra and possible routes of infection of the hydra by these prokaryotic symbionts are discussed. Their importance in interpreting results of certain types of physiological experiments using aquatic organisms is emphasized.
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