Effects of selenite on green microalga Haematococcus pluvialis : Bioaccumulation of selenium and enhancement of astaxanthin production

摘要: Algae are at a low trophic level and play crucial role in aquatic food webs. They can uptake accumulate the trace element selenium (Se), which be either essential or toxic to algal growth depending on dosage species. Se toxicity algae resistance varied across different organisms. In order investigate effects of unicellular green alga Haematococcus pluvialis, an important industrial resource for natural astaxanthin, rate, chlorophyll content, fluorescence parameters were derived from experimental treatment with concentrations selenite. The results showed that EC50 rate was 24mg/L, selenite (3mg/L) may not hinder H. pluvialis cell growth, but levels higher than 13mg/L do restrain growth. Bioaccumulation experiments accumulated up 646μg/g total 380μg/g organic Se, dry weight. However, high significantly increased intracellular hydrogen peroxide levels, antioxidant enzyme activity, production suggesting bioaccumulation might pluvialis.