Geosmin Production and Excretion in a Planktonic and Benthic Oscillatoria

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Abstract
Geosmin and carotenoid contents for the benthic Oscillatoria brevis and the planktonic Oscillatoria bornetii 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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