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Effects of associated bacteria on the pathogenicity and reproduction of the insect-parasitic nematode Rhabditis blumi (Nematoda: Rhabditida)

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Abstract:

Three bacteria, Alcaligenes faecalis, Flavobacterium sp., and Providencia vermicola, were isolated from dauer juveniles of Rhabditis blumi. The pathogenic effects of the bacteria against 4th instar larvae of Galleria mellonella were investigated. Providencia vermicola and Flavobacterium sp. showed 100% mortality at 48 h after haemocoelic injection, whereas A. faecalis showed less than 30% mortality. Dauer juveniles showed 100% mortality against G. mellonella larvae, whereas axenic juveniles, which do not harbor associated bacteria, exhibited little mortality. All of the associated bacteria were used as a food source for nematode growth, and nematode yield differed with bacterial species. Among the bacterial species, P. vermicola was most valued for nematode yield, showing the highest yield of 5.2 × 104 nematodes/mL in the plate. In bacterial cocultures using two of the three associated bacteria, one kind stimulated the other. The highest total bacterial yield of 12.6 g/L was obtained when the inoculum ratio of P. vermicola to A. faecalis was 10:1. In air-lift bioreactors, the nematode growth rate increased with an increasing level of dissolved oxygen. The maximum nematode yield of 1.75 × 105 nematodes/mL was obtained at 192 h with an aeration rate of 6 vvm.

Keywords: Rhabditis blumi; associated bacteria; bactéries associées; insect mortality; mortalité des insectes; nematode; nématode; reproduction

Document Type: Research Article

DOI: http://dx.doi.org/10.1139/w11-067

Affiliations: 1: Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Shinchon-dong, Seodaemun-gu, Seoul 120-749, South Korea. 2: Horticultural and Herbal Crop Environment Division, National Institute of Horticultural and Herbal Science, RDA, Suwon, Gyeonggi 441-440, South Korea. 3: Department of Mosquito Control, Cape May Court House, NJ 08210, USA.

Publication date: September 30, 2011

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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