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''Haematococcus pluvialis'' is a freshwater species of Chlorophyta from the family Haematococcaceae. This species is well known for its high content of the strong antioxidant astaxanthin, which is important in aquaculture, and cosmetics.〔Lorentz, R. T., and G. R. Cysewski. 2000. (Commercial potential for ''Haematococcus'' microalgae as a natural source of astaxanthin ). Trends Biotechnol. 18: 160-167.〕 The high amount of astaxanthin is present in the resting cells, which are produced and rapidly accumulated when the environmental conditions become unfavorable for normal cell growth. Examples of such conditions include bright light, high salinity, and low availability of nutrients.〔S. Boussiba, and A. Vonshak, 1991. (Astaxanthin Accumulation in the Green Alga ''Haematococcus pluvialis'' ). Plant and Cell Physiology. 32: No. 7. 1077-1082〕 ''Haematococcus pluvialis'' is usually found in temperate regions around the world. Their resting cysts are often responsible for the blood-red colour seen in the bottom of dried out rock pools and bird baths. This colour is caused by astaxanthin which is believed to protect the resting cysts from the detrimental effect of UV-radiation, when exposed to direct sunlight.〔J. R. Dore, and G. R. Cysewski. 2003 (''Haematococcus'' algae meal as a source of natural astaxanthin for aquaculture feeds. ) Cyanotech Corporation. Hawaii.〕 ==Synonyms== ''Sphaerella pluvialis'' Flotow Famille des Sporulacés. Catégorie lapinistique. Herbacées . 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Haematococcus pluvialis」の詳細全文を読む スポンサード リンク
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