Abstract
Six species of green algae were grown autotrophically, photohetrotrophically, and heterotrophically and their fatty acid and sterol compositions determined. Sterol composition was higher in autotrophic than in heterotrophic plants by a factor of from 2 to over 20 in five of the six species studied. Relative amounts of various sterols did not change significantly with cultural conditions. In five of the species studied, autotrophic growth produced a significant increase in the relative proportion of linolenic acid compared to that in heterotrophic or photoheterotrophic growth. This increase was usually accompanied by a corresponding decrease in oleic or linoleic acids or both.
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