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Culturing the bioluminescent bacterium Photorhabdus luminescens in nutrient broth (NB) is used to recover phase I cells. These phase I cells were highly luminescent for up to 7 h in this media and the luminosity could also be seen with the naked eye after a 15 min eye adjustment period in a dark room. Red pigmentation is a known trait of phase I cells and was visually distinct within the culture media. The color shade of the red pigment varied on nutrient agar and in NB suggesting that the concentration of the pigment produced is dependent upon density of phase I cells within a specified area. The specific growth rate (μ) and doubling time (g) was determined during the logarithmic growth phase to be 0.36 h(-1) and 2.1 h, respectively in NB medium. The nematode-bacterium suspension was injected into larvae of Galleria mellonella to test for entomopathogencity. Within 24 h post-injection insect mortality was seen along with dark red pigmentation and extremely high luminosity indicating infection with P. luminescens.

Characterization of Photorhabdus luminescens Growth for the Rearing of the Beneficial Nematode Heterorhabditis bacteriophora