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CHANGES IN CHLOROPHYLL A FLUORENSCENCE AND PIGMENT RATIOS DURING DIFFERENT GROWTH PHASES OF A UNICELLULAR MARINE CHEATOSEROS (BACILLARIOPHYCEAE) IN BATCH CULTURE
Citation:
Thursby, G B., A. F. Santos, AND A. Sigleo. CHANGES IN CHLOROPHYLL A FLUORENSCENCE AND PIGMENT RATIOS DURING DIFFERENT GROWTH PHASES OF A UNICELLULAR MARINE CHEATOSEROS (BACILLARIOPHYCEAE) IN BATCH CULTURE. Presented at 24th Southeastern Phycological Colloquy, Ft. Pierce, FL, November 1-3, 2002.
Description:
Photosystem II reaction centers per cell decreased as the cultures began to decline. The degree of inactivation increased daily as the cell numbers continued to decrease. The concentration of chlorophyll a per cell and the ratio of the major accessory pigments to chlorophyll a (e.g., fucoxanthin, chlorophyll C1 + C2) remained relatively constant throughout the experiment. The ratio of chlorophyll C1 to chlorophyll C2, however, began to increase at about the time the cultures were senescing (ca. day 20). In addition, the sum of the xanthophylls diatoxanthin and diadinoxanthin per cell decreased during the course of the culture cycle and a xanthophyll tentatively identified as zeaxanthin unexpectedly appeared at the time the cell numbers were declining, and continued to increase until the end of the experiment. The basic interpretation of fluorescence induction kinetics for diatoms appeared to be similar to that for green plants, however, there were differences in the diatom response beyond the initial induction phase.