BIOLUMINESCENCE AND CHLOROPLAST MOVEMENT IN THE DINOFLAGELLATE PYROCYSTIS LUNULA1

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Abstract
The lunate cysts of Pyrocystis lunula have a bioluminescent emission spectrum with a peak intensity of 477.5 [plus or minus] 1 m[mu]. The light originates from the protoplasm in the center of the cysts. Six to eight hr after the cysts were placed in the dark, they produced 300 to 800 times more luminescence than controls maintained under constant illumination. Plastids contract distally when the cysts are placed in the dark. If kept in the dark, the plastids contract dlstally and expand with a clrcadlan rhythm persisting several days. At intensities of 2200 [mu]w cm-2 or less, the plastlds are expanded. The plastlds are contracted into the central area of the cysts at light intensities of 4000 [mu]w cm-2 and above. The Gymnodinium stage of the life cycle is not blolumlnescent.