Abstract
The chlorophyte Dunaliella is classified under the order Volvocales, which includes a variety of ill-defined unicellular species. Members of the genus Dunaliella are all motile, ovoid biflagellates with a cell volume ranging from 50 to 1000 µm3 (Butcher, 1959). The alga contains one large chloroplast with a single pyrenoid and many starch granules in the basal portion of the chloroplast. Like most green algae, Dunaliella contains the typical extrachloroplast organelles: membrane-bound nucleus, mitochondria, small vacuoles, Golgi bodies, and eye spots. However, unlike the other green algae, Dunaliella lacks a rigid cell wall, and the cell is enclosed by a thin, elastic, plasma membrane covered by a mucus “surface coat.” The lack of a rigid cell wall permits rapid cell-volume responses to the extracellular osmotic changes.
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