Abstract
The effects of three ecdysteroids, 20‐hydroxyecdysone (20E), 2‐deoxy‐20‐hydroxyecdysone (2d20E) and 20‐hydroxyecdysone 22‐acetate (20E22Ac), on growth and the levels of cellular components in Chlorella vulgaris Beijerinck (Trebouxiophyceae) are reported and compared with data previously reported for ecdysone (E; Bajguz A and Koronka A, Plant Physiol Biochem 39: 707–715, 2001). All three 20‐hydroxyecdysteroids stimulate growth of C. vulgaris cells over a wide concentration range (10−16 to 10−7 M). Optimal stimulation is observed at 10−9 M with each ecdysteroid. High concentrations (>10−6 M) are cytotoxic. The potency ranking of the ecdysteroids is 20E > 20E22Ac > 2d20E > E. Levels per cell of DNA, RNA, protein, sugars, organic and inorganic phosphorus, chlorophylls a and b and phaeophytins a and b are all stimulated by ecdysteroid treatment when compared with the untreated control cells. Possible modes of action of ecdysteroids on C. vulgaris cells are discussed.
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