The preference of nematodes for feeding on, and retention of strains and form variants of symbionts was tested. Heterorhabditis megidis strains DH-SH1 (= HSH) and NLH-E87.3 (= HE) could multiply on the primary forms of both symbionts. Photorhabdus luminescens strains PSH/1 and PE/1, respectively, and did not prefer one strain to the other. Both nematodes could not reproduce on the secondary form of their own symbiont; however, HSH could multiply on the secondary form PE/2. This suggests that the negative effect a secondary form bacterium has on nematode reproduction, is not a common factor in all secondary forms. When put on a plate with primary and secondary form bacteria, most infective juveniles preferred to feed on primary form bacteria. All nematodes were able to retain the bacteria they had been cultured on, including the secondary form. These results suggest that the nematodes prefer the primary form as a food source but the retention of bacteria is not as specific as suggested before in the literature.
|Journal||Fundamental and applied nematology|
|Publication status||Published - 1997|