Photosynthetic UV stress tolerance of the Antarctic snow alga Chlorella sp. modified by enhanced temperature?

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dc.contributor.authorRivas, C.
dc.contributor.authorNavarro, N.
dc.contributor.authorHuovinen, Pirjo
dc.contributor.authorGómez, L.
dc.coverage.spatialIsla Rey Jorge, Bahía Fildes
dc.date.accessioned2017-04-06T21:18:12Z
dc.date.available2017-04-06T21:18:12Z
dc.date.issued2016
dc.descriptionBioMed Centrales_ES
dc.description.abstractBackground: Photosynthetic characteristics and the effect of UV radiation and elevated temperature measured were studied in Chlorella sp. isolated from a snow microalgal community at King George Island, Maritime Antarctica through the chlorophyll florescence (rapid light curves and maximum quantum yield, respectively). The environmental context was monitored through measurements of spectral depth profiles of solar radiation (down to 40 cm) in the snowpack as well as a through continuous recording of temperature and PAR using dataloggers located at different depths (0–30 cm) within the snow column. Results: The photochemistry of Chlorella sp. was affected by UV radiation in a 12-h laboratory exposure under all studied temperatures (5, 10, 15, 20 °C): the algae exposed to PAR + UV-A radiation were inhibited by 5.8 % whilst PAR + UV-A + UV-B radiation decreased Fv/Fm by 15.8 %. In both treatments the 12-h recovery after UV exposure was almost complete (80–100 %). Electron transport based P-I curve parameters maximal electron transport rate (ETRmax), photosynthetic efficiency (α) and the saturating irradiance (Ek) no varied in response to different temperatures. Conclusions: Results revealed that Chlorella sp. not only shows high photosynthetic efficiency at ambient conditions, but also exhibits tolerance to solar radiation under higher temperatures and possessing a capacity for recovery after inhibition of photosynthesis by UV radiation.es_ES
dc.description.sponsorshipThe study was supported by the PhD Grant DT_09-14 from Instituto Antártico Chileno (INACh) and Project ANILLO ART1101, from Conicyt. The logistic support provided by INACh and the collaboration of the staff of Base Julio Escudero Station are greatly acknowledged. This is contribution # 9 of the ANILLO ART1101 project.es_ES
dc.identifier.citationRivas et al. Revista Chilena de Historia Natural (2016) 89:7es_ES
dc.identifier.issn0717-6317
dc.identifier.otherDOI 10.1186/s40693-016-0050-1
dc.identifier.urihttp://hdl.handle.net/20.500.11894/903
dc.language.isoenes_ES
dc.publisherSociedad de Biología de Chilees_ES
dc.relation.ispartofRevista Chilena de Historia Naturales_ES
dc.rightsCreative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), que permite el uso sin restricciones, distribución y reproducción en cualquier medio, siempre y cuando otorgue un crédito apropiado al autor original (s) y la fuente, proporcione un enlace a la licencia de Creative Commonses_ES
dc.subjectCienciaes_ES
dc.subjectSnow algaees_ES
dc.subjectPhotosynthesises_ES
dc.subjectUV radiationes_ES
dc.subjectTemperaturees_ES
dc.titlePhotosynthetic UV stress tolerance of the Antarctic snow alga Chlorella sp. modified by enhanced temperature?es_ES
dc.typeArtículoes_ES

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