Abstract
Prochloron sp. isolated from Diplosoma virens and incubated in the light in NaH14CO3 demonstrated a high photosynthetic capacity (up to 3.7 p.gC@ (p.g Chlorophyll a)@ . hr1) . In vitro these cyanobacteria release a maximum of 7% of the ‘?�@C they fix in the light. Dark fixation was found to be maximally 3% of light fixation and release in the dark averaged 26% of the total 14Cfixed in the dark. These data imply that the organic carbon released by these cyanobacteria may not be quantitatively important to the host. The labeled compound released by Prochioron in the light is glycolic acid. The major compounds produced by light and dark carbon fixation in Prochloron are identified, and similarities to other photosynthetic cyanobacteria are noted.
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