Figure 2: Bacterial supernatants harm non-farmers and benefit farmers.
From: Social amoeba farmers carry defensive symbionts to protect and privatize their crops
Supernatants from farmer-associated B. xenovorans isolates harm non-farmers and benefit farmers in the solitary, vegetative stage as well as the social stage. We tested 10 clones (5 farmers and 5 non-farmers) for amoebae and spore production in B. xenovorans. Each D. discoideum was tested against all five supernatants, as well as five buffer controls and the averages were plotted. Non-farmers produce fewer amoebae and fewer spores in all B. xenovorans supernatants compared with starvation buffer alone, whereas farmers consistently benefited from supernatants. Error bars equal s.e.m. *P<0.05, **P<0.005 and ***P<0.0005 (unequal-variance two-tailed t-tests, 7 df).
