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dc.creatorHernando,Marcelo
dc.creatorMalanga,Gabriela
dc.creatorPuntarulo,Susana
dc.creatorFerreyra,Gustavo
dc.date2011-11-01
dc.date.accessioned2019-05-03T13:27:10Z
dc.date.available2019-05-03T13:27:10Z
dc.identifierhttps://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0718-560X2011000300001
dc.identifier.urihttp://revistaschilenas.uchile.cl/handle/2250/87725
dc.descriptionIn 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 &#945;-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 &#946;-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 &#945;-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 &#945;-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.formattext/html
dc.languageen
dc.publisherPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
dc.relation10.4067/S0718-560X2011000300001
dc.rightsinfo:eu-repo/semantics/openAccess
dc.sourceLatin american journal of aquatic research v.39 n.3 2011
dc.subject&#946;-carotene
dc.subject&#945;-tocopherol
dc.subjectgrowth rate
dc.subjectdiatoms
dc.subjectMAAs
dc.subjectphotoprotection
dc.subjectAntarctica
dc.titleFotoprotección antioxidante no-enzimática contra el potencial daño inducido por UVBR en una diatomea antártica (Thalassiosira sp.)


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