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Fig. 3 | BMC Genomics

Fig. 3

From: In vitro resynthesis of lichenization reveals the genetic background of symbiosis-specific fungal-algal interaction in Usnea hakonensis

Fig. 3

Hypothesis of the symbiosis-specific nutrient transport between Usnea hakonensis and Trebouxia sp. a The photobiont adjusts photosynthetic activity to provide carbohydrates for the entire symbiotic structure. b Light and carbon dioxide conditions inside the symbiotic structure initiate symbiosis-specific metabolism of the photobiont. c Photosynthetic product, ribitol, is released to the symbiotic interface and imported by ribitol transporters of the mycobiont. d Phosphate is exported to the symbiotic interface by fungal phosphate transporters and taken up by algal phosphate transporters driven by the proton electrochemical gradient. e Various nitrogen compounds, such as amino acids, are transported from the mycobiont to the photobiont

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