Growth and Phylogenetic Characteristics of a Pelagic Marine Bacterium, Alteromonas sp. KE10, Adapted to Low-nutrient Environments.

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  • MAEDA TOSHIMICHI
    Department of Food Science and Technology, National Fisheries University
  • YOSHINAGA IKUO
    Department of Applied Bioscience, Graduate School of Agriculture, Kyoto University
  • MURAKAMI MASATADA
    Department of Food Science and Technology, National Fisheries University
  • SHIBA TSUNEO
    Department of Food Science and Technology, National Fisheries University
  • ISHIDA YUZABUROU
    Department of Biotechnology, Faculty of Engineering, Fukuyama University

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Growth of the marine bacterial strain KE10, Vibrio harveyi, Cytophaga latercula, and Escherichia coli was examined in two different concentrations of organic nutrients; 0.2 and 200mg carbon per liter (C/1). All bacteria grew at these two concentrations with a relatively lower growth rate at 0.2mg C/1. The ratio of the growth rate at 0.2mg C/1 to 200mg C/1 ranged from 0.70 to 0.44 for KE10 and 0.34 to 0.16 for the other bacterial strains tested. At the lower concentration, 0.2mg C/1, KE10 showed the highest growth rate among the strains examined. At the stationary growth phase, KE10 reached 2.8×106cells/ml, which was ten times higher than the maximum cell densities of other bacterial species. KE10 was a gram-negative, aerobic, rod-shaped bacterium and was motile by flagella. A phylogenetic analysis based on 16S rRNA gene and phenotypic characteristics showed that KE10 belonged to the genus Alteromonas and was closely related to Alteromonas infernus.

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