부산대학교 도서관

Delftia sp. JD2 is a heavy metal-resistant bacterium that promotes alfalfa, soybean, and clover root development and early nodulation when co-inoculated with their corresponding rhizobial strains. It also increases the grain yield of soybean plants. This strain could be considered for biotechnological applications, which requires the study of its harmlessness or toxicity. Thus, we analyzed the genome of JD2 by searching for pathogenicity factors. We also examined the potential toxicity of JD2 in some animals such as earthworms, planktonic crustaceans, fishes, and mammalians using Eisenia foetida, Daphnia magna, Danio rerio (zebrafish), and Mus musculus (mouse) as model organisms, following standard toxicity protocols. We found that JD2 genome codes for antibacterial virulence factors, active efflux pumps, and a versatile type VI secretion system that could participate in virulence and also other processes such as mobility, biofilm formation, and root infection. We also found that JD2 could be considered a safe microbe, at least in the tested organisms and according to the analyzed parameters.