Skip to main content
. 2014 Dec 16;5:5776. doi: 10.1038/ncomms6776

Figure 1. Urea produced by bacteria in cow dung functions as a signal molecule to induce trap formation in A. oligospora.

Figure 1

(a) Trap formation in A. oligospora in the vicinity of cow dung. Cow dung (brown area in the bottom of the plate) was placed on a water agar plate. After conidia of A. oligospora were added at position 2 cm away from dung, traps were produced (arrow). (b) Deletion of arcA completely abolished the production of urea in S. maltophila CD52 in LB medium and MM, respectively. Data are expressed as mean±s.d. of three independent experiments. ***P<0.001 versus CD52 (t-test). (c) Effect of urea concentration on trap formation in A. oligospora at 72 h. (d) Expression of arcA in S. maltophila was induced by the addition of nematodes in LB medium and MM. Data are expressed as mean±s.d. of three independent experiments. **P<0.01 versus control (0 h; t-test). (e) The urea levels in the supernatant in S. maltophila were elevated by nematodes. Data are expressed as mean±s.d. of three independent experiments. **P<0.01 versus wild-type (WT) only (t-test). (f) Deletion of arcA significantly suppressed S. maltophila-mediated trap formation in A. oligospora. Data are expressed as mean±s.d. of three independent experiments. **P<0.01 versus CD52 (t-test).