Figure 4.

Longitudinal distribution of sensed pH by Synechocystis sp. PCC6803 bioreporter cells attached to C. cinerea hyphae. Data reflect average pH and pH distribution of n > 2400 cells incubated at various distances along the observation chamber at t = 18 h and t = 25 h. Average data include pH signals from all cells at ±500 µm from given distances. Significantly (p < 0.05) lower pH (≈0.8 pH) was observed near the hyphal tips (cf. at >3000 µm at t = 18 h, and at >4500 µm at t = 25 h) than those at the more mature part at the entrance of the observation chamber (x = 0–500 µm).