A. Bajguz, L. Dinan
Jul 1, 2004
Citations
0
Influential Citations
14
Citations
Journal
Physiologia Plantarum
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.