Abstract
Purple non-sulfur bacteria are a group of metabolically diverse bacteria that can grow photoautotrophically, photoheterotrophically, chemoheterotrophically, or chemoautotrophically. These bacteria are widely distributed in nature occurring in lakes, water ponds, coastal lagoons or high concentration organic waste lagoons. Lotus Pond, located in northern Kaohsiung City, is a hyper-eutrophied artificial lake. Due to sufficient light and pollution with significant amounts of soluble organic matter, the ecology of this lake is suitable for the growth of purple non-sulfur bacteria. In this study, 16 purple non-sulfur bacteria strains were isolated from the water and mud of Lotus Pond using Winogradsky columns. The 16S rDNA fragments of these strains were amplified by polymerase chain reaction, and their DNA sequences were compared with GenBank database. Phylogenetic analysis of these sequences indicated that these strains belong to the following three groups of purple non-sulfur bacteria: Rhodopseudomonas, Rubrivivax, and Rhodobacter. We found that all isolated strains are Gram negative bacteria containing bacteriochlorophyll a and carotenoid. Salt tolerant studies showed that the strain in Rhodobacter group grows well in 3% NaC1, while both Rhodopseudomonas and Rubrivivax groups grow only in 1% NaC1.
Published Version
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