dc.creator | Hernando,Marcelo | |
dc.creator | Malanga,Gabriela | |
dc.creator | Puntarulo,Susana | |
dc.creator | Ferreyra,Gustavo | |
dc.date | 2011-11-01 | |
dc.date.accessioned | 2019-05-03T13:27:10Z | |
dc.date.available | 2019-05-03T13:27:10Z | |
dc.identifier | https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0718-560X2011000300001 | |
dc.identifier.uri | http://revistaschilenas.uchile.cl/handle/2250/87725 | |
dc.description | In January 1999, unialgal cultures of the diatom Thalassiosira sp., solate from natural phyto-plankton assemblages from Potter Cove, Antarctica, were exposed to solar ultraviolet radiation (UVR, 280400 nm) in order to study the long-term acclimation of this species. Ultraviolet radiation B (UVBR, 280-315 nm) inhibited the growth rate during the first and second days of exposure. No UVBR inhibition was observed on the third day. The initial content of α-tocopherol (13 pmol (10(4) cell)-1) showed a marked decrease during the exponential growth phase (4 pmol (10(4) cell-1) by day 3). The initial content of β-carotene (3 pmol (10(4) cell)-1) did not show significant differences over time in cells exposed to UVBR. Two mycosporine-like amino acids (MAAs) were identified: porphyra-334 and shinorine. Cellular concentrations of MAAs increased significantly on days 2 and 3, and exposure of the algae to UVBR significantly enhanced this value. The relative importance of MAAs concentration was significant (P < 0.05) in relation to the α-tocopherol content. A positive correlation was shown between cellular MAAs concentration and growth rate. Our results suggest that photoprotection against UV-induced damage is characterized by short-term consumption of α-tocopherol and longer-term synthesis of MAAs. The UVBR damage/repair ratio during long-term exposure involves the combined action of several endogenous factors within the cell, with MAAs synthesis being the most effective factor related to photoprotection. | |
dc.format | text/html | |
dc.language | en | |
dc.publisher | Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar | |
dc.relation | 10.4067/S0718-560X2011000300001 | |
dc.rights | info:eu-repo/semantics/openAccess | |
dc.source | Latin american journal of aquatic research v.39 n.3 2011 | |
dc.subject | β-carotene | |
dc.subject | α-tocopherol | |
dc.subject | growth rate | |
dc.subject | diatoms | |
dc.subject | MAAs | |
dc.subject | photoprotection | |
dc.subject | Antarctica | |
dc.title | Fotoprotección antioxidante no-enzimática contra el potencial daño inducido por UVBR en una diatomea antártica (Thalassiosira sp.) | |