Isolation and characterization of phototrophic purple nonsulfur bacteria from Chloroflexus and cyanobacterial mats in hot springs

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  • Okamura Keiko
    Department of Ecological Engineering, Toyohashi University of Technology
  • Hisada Takayoshi
    Department of Ecological Engineering, Toyohashi University of Technology Techno Suruga Laboratory Co., Ltd.
  • Hiraishi Akira
    Department of Ecological Engineering, Toyohashi University of Technology

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  • Characterization of thermotolerant purple nonsulfur bacteria isolated from hot-spring Chloroflexus mats and the reclassification of "Rhodopseudomonas cryptolactis" Stadtwald-Demchick et al.1990 as Rhodoplanes cryptolactis nom. rev., comb. nov.

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Chloroflexus and cyanobacterial mats developing at 50-65°C in Nakanoyu and Nakabusa hot springs, Japan, were collected and cultivated phototrophically at 50 and 37°C. Chloroflexus organisms grew when incubated at 50°C, whereas the incubation at 37°C resulted in the enrichment of pink- to brown-colored cultures, from which different species of phototrophic purple nonsulfur (PPNS) bacteria were isolated. The majority of the isolates grew at temperatures of up to 45°C and optimally at around 40°C. The high frequencies of the occurrence of PPNS bacteria in hot spring microbial mats suggest that these environments offer a favorable ecological niche for these bacteria.<br>

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