Effect of UV stress on the fatty acid and lipid class composition in two marine microalgae Pavlova lutheri (Pavlovophyceae) and Odontella aurita (Bacillariophyceae)
| Type | : | ACL |
|---|---|---|
| Nature | : | Production scientifique |
| Au bénéfice du Laboratoire | : | Non |
| Statut de publication | : | Publié |
| Année de publication | : | 2010 |
| Auteurs (6) | : | GUIHÉNEUF Freddy FOUQUERAY Manuela MIMOUNI Virginie ULMANN Lionel JACQUETTE Boris TREMBLIN Gerard |
| Revue scientifique | : | Journal of Applied Phycology |
| Volume | : | 22 |
| Fascicule | : | 5 |
| Pages | : | 629-638 |
| DOI | : | 10.1007/s10811-010-9503-0 |
| URL | : | - |
| Abstract | : | 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. |
| Mots-clés | : | Pavlova lutheri; Odontella aurita; UV radiation; Lipid classes; n-3 fatty acids |
| Commentaire | : | - |
| Tags | : | - |
| Fichier attaché | : | - |
| Citation | : |
Guihéneuf F, Fouqueray M, Mimouni V, Ulmann L, Jacquette B, Tremblin G (2010) Effect of UV stress on the fatty acid and lipid class composition in two marine microalgae Pavlova lutheri (Pavlovophyceae) and Odontella aurita (Bacillariophyceae). J Appl Phycol 22: 629-638 | doi: 10.1007/s10811-010-9503-0
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