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The production of geosmin from the cyanobacterium OsciUatoria brevis was studied as a function of the photon fluence rate and appears to be related to the chlorophyll content.

Geosmin and carotenoid contents for the benthic Oscillatoriabrevis and the planktonic Oscillatoriabornetii were examined under different growth conditions. The results obtained when the effects of light intensity, light quality and growth rate were examined indicate that geosmiri could be a by-product of the isoprenoid pathway leading to chlorophyll and carotenoids in Oscillatoria and not a overflow product of this pathway as earlier suggested. The connection between geosmin and pigment synthesis suggests that geosmin production by a cyanobacterial bloom might be lowest at the surface and increase with depth in the water column. Geosmin is also found to be an intracellular compound, which is released upon death and decay of the organisms.

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