TABLE 2.
Comparison of the activities of phase I and phase II variants of Xenorhabdus species grown on NA plates containing 1% (vol/vol) Tween and NA plates containing 0.01% (wt/vol) lecithin after 7 days of incubation at 28°C
| Nematode host | Bacterium
|
Activity witha:
|
||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Lecithin
|
Tweens 20, 40, and 60
|
Tween 80
|
Tween 85
|
|||||||
| Taxon | Strain | Phase I variant | Phase II variant | Phase I variant | Phase II variant | Phase I variant | Phase II variant | Phase I variant | Phase II variant | |
| Steinernema sp. | X. beddingii | Q58 | + | − | + | +w | +w | − | + | +w |
| S. feltiae | X. bovienii | F5 | + | − | − | +w | − | − | + | − |
| S. affine | X. bovienii | F3 | + | − | − | +w | − | − | − | − |
| S. feltiae | X. bovienii | T228 | + | − | − | − | − | − | − | − |
| S. intermedium | X. bovienii | Si | + | − | − | +w | − | +w | − | +w |
| S. kraussei | X. bovienii | SK2 | + | − | − | + | − | − | − | − |
| S. carpocapsae | X. nematophilus | F1 | + | +w | + | + | + | + | − | +w |
| S. carpocapsae | X. nematophilus | A24 | + | +w | + | + | − | − | + | + |
| S. carpocapsae | X. nematophilus | AN6 | +w | − | + | + | − | − | − | − |
| Steinernema sp. | Xenorhabdus sp. | M16 | + | − | +w | + | + | + | +w | +w |
| S. anomalae | Xenorhabdus sp. | Sav | + | − | + | + | − | − | + | + |
a
Activity as measured by the production of a white halo of precipitation surrounding each colony. +, strong production; −, no production; +w, weak production.