Synechococcus clone WH7803 (DC2) was grown on a 12:12 h light-dark cycle of either blue-green fluorescent, white fluorescent or daylight-filtered tungsten light. Comparison of directly-measured and reconstructed absorption spectra suggests that pigment packaging effects are minimal in Synechococcus . Cellular concentrations of chlorophyll a, beta -carotene and phycoerythrin were all similar to 2-fold lower in daylight-grown Synechococcus relative to blue-green and white light-grown cells; ratios of beta -carotene- and phycoerythrin-to-chlorophyll a were markedly constant for all 3 illuminations. Blue-green light grown Synechococcus cells had a similar to 2-fold higher zeaxanthin content than those grown under white light or daylight illuminations.
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