Abstract
Three algae species belonging to Chlorophyta; i.e Chlorella sp ., Scenedesmus sp . and Haematococcus pluvialis, were incubated under different concentrations of the photosynthetic inhibitor dichlorophynyldimethylurea (DCMU). Algae were treated with 0, 1, 2, 4 and 8x10-5M DCMU added to N8 macronutrient solution containing ammonium acetate instead of potassium nitrate. The measured parameters were optical density, cell count, medium reaction (pH), total chlorophyll, total carotenoids, crude protein and lipids as ether extract. Results showed that DCMU inhibited growth as optical density for both Scenedesmus sp. and Chlorella sp. H. pluvialis exhibited more resistance against all given concentrations. Chlorophyll reached the maximum with lower and moderate levels of DCMU with Scenedesmus sp. and Chlorella sp. As for H. pluvialis, all used concentrations inhibited chlorophyll accumulation. A different manner was observed on carotenoids accumulation, where the decline of chlorophyll was associated with the decomposition of crude protein and rise in carotenoids and lipids content especially with H. pluvialis.
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