Abstract
Some coral-associated bacteria show protective roles for corals against pathogens. However, the distribution of coral-protecting bacteria in seawater is not well known. In addition, compared with the methods for investigating coral pathogens, few methods have been developed to detect coral-protecting bacteria. Here we prepared a simple method for detecting Ruegeria spp., some strains of which inhibit growth of the coral pathogen Vibrio coralliilyticus. We successfully obtained two Ruegeria-targeting primer sets through in silico and in vitro screening. The primer sets r38F-r30R and r445F-r446R, in addition to the newly designed universal primer set U357'F-U515'R, were evaluated in vitro using environmental DNA extracted from seawater collected in Osaka. These methods and primers should contribute to revealing the distribution of Ruegeria spp. in marine environments.
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