期刊
JOURNAL OF APPLIED PHYCOLOGY
卷 22, 期 5, 页码 629-638出版社
SPRINGER
DOI: 10.1007/s10811-010-9503-0
关键词
Pavlova lutheri; Odontella aurita; UV radiation; Lipid classes; n-3 fatty acids
资金
- Ministere de l'Education Nationale de l'Enseignement Superieur et de la Recherche (MENESR)
- Conseil General de la Mayenne
- Laval Agglomeration
- CCI de la Mayenne
Polyunsaturated fatty acids (PUFAs), especially eicosapentaenoic and docosahexaenoic acids (EPA and DHA), are abundantly synthesized by some phytoplankton species and play a key role in the marine food chain. However, they are generally considered to be sensitive to oxidation by UV radiation (UV-R). In order to investigate the effect of UV-R on the lipid composition of two marine microalgae, Pavlova lutheri and Odontella aurita, they were exposed to a combination of UVA-R and UVB-R with a total UV-R daily dose of 110 kJ m(-2). Chlorophyll a, photochemical efficiency, and lipid composition were then determined on days 3, 5, and 8 of UV-R exposure. In P. lutheri, exposure to UV-R treatment led to a decrease in the proportions of PUFAs, such as EPA and DHA, especially into structural lipids (glycolipids and phospholipids). Our findings reveal a reduction of 20% in EPA levels and 16% in DHA levels, after 8 days of UV-R treatment. In O. aurita, exposure to UV-R did not change the fatty acid composition of the total lipids and lipid fractions of the cells. EPA levels remained high (27-28% of total lipids) during the 8 days of treatment. Consequently, the n-3 fatty acid content of P. lutheri was altered which highlights the sensitivity of this species to UV-R, whereas the results obtained for O. aurita suggest a more UV-R resistance. As a result, in latitude countries with medium UV-R level, outdoor race-way culture of O. aurita could yield a high-EPA algal biomass, whatever the seasonal variations in UV-R.
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