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The Primary Form of Xenorhabdus Species (Enterobacteriaceae: Eubacteriales) May Consist of More Than One Bacterial Species

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image of Nematologica
For more content, see Nematology.

Xenorhabdus species are bacteria symbiotically associated with the infective juveniles of entomophagous nematode species of the genera Steinernema and Heterorhabditis. On culture plates these bacteria occur in two different forms, the primary and the secondary form. In Gram stained smears of primary form Xenorhabdus species older than three days, bacterial cells are regularly present that are less than half the length of typical Xenorhabdus cells. It is suggested that these small cells represent a new, slow-growing, unnamed bacterial species which is maintained by the mucoid layer present around the primary form Xenorhabdus cells. In the secondary form of Xenorhabdus both mucoid layer and the small-celled bacterium are absent.

Affiliations: 1: DSIR Plant Protection, Mount Albert Research Centre, Private Bag, Auckland, New Zealand


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