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. 2020 Jan 23;9:F1000 Faculty Rev-39. [Version 1] doi: 10.12688/f1000research.19740.1

Figure 2. The Azolla–cyanobacteria symbiosis.

Figure 2.

In Azolla, expression of MOT1, AMT2-4, and an iron transporter related to AtVIT1 is induced by N-limiting conditions. MOT1 may be an uptake transporter, AMT2-4 may transport fixed N from the cyanobacteria into the plant, and the iron transporter may serve as an iron efflux transporter. In the cyanobacteria, a phosphotransferase system (PTS) sugar transporter could function in sugar uptake and AmtB could function in ammonium efflux. Iron and molybdate transporters in the cyanobacteria are hypothetical.