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Effect of β-N-methylamino-l-alanine (BMAA) on the growth of the unicellular cyanobacterium Synechocystis PCC 6803 (A) and the filamentous diazotrophic strain Anabaena PCC 7120 (B,C). Growth curves were measured by following the optical density (OD) by spectrometer. The two strains were grown either in BG11 (A,B, containing nitrate as combined nitrogen source), or in BG110 without combined nitrogen (C). The concentration of BMAA used for each culture was indicated.
