Fig. 3: Time-lapse micrographs recording fungal colonisation and bioreporter signals in the observation area.

a-d Bright-field and e-h fluorescence micrographs of the pH observation area during colonisation of the bioreporter agar pad by C. cinerea hyphae over 48 h. Fluorescence micrographs show the overlay of the emission signals of Synechocystis sp. PCC6803 cells after excitation at 475 nm (I510-475) and 395 nm (I510–395), resp. In b, for better visibility, the contours of the colonising hyphae are marked by white dash lines.