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

BACKGROUND: 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 y...

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Autores principales:	Rivas,C., Navarro,N., Huovinen,P., Gómez,I.
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2016
Materias:	Antarctica Snow algae Chlorella sp Photosynthesis UV radiation Temperature
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2016000100006
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spelling	oai:scielo:S0716-078X20160001000062016-09-27Photosynthetic UV stress tolerance of the Antarctic snow alga Chlorella sp. modified by enhanced temperature?Rivas,C.Navarro,N.Huovinen,P.Gómez,I. Antarctica Snow algae Chlorella sp Photosynthesis UV radiation Temperature BACKGROUND: 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 radiationinfo:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.89 20162016-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2016000100006en10.1186/S40693-016-0050-1
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Antarctica Snow algae Chlorella sp Photosynthesis UV radiation Temperature
spellingShingle	Antarctica Snow algae Chlorella sp Photosynthesis UV radiation Temperature Rivas,C. Navarro,N. Huovinen,P. Gómez,I. Photosynthetic UV stress tolerance of the Antarctic snow alga Chlorella sp. modified by enhanced temperature?
description	BACKGROUND: 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
author	Rivas,C. Navarro,N. Huovinen,P. Gómez,I.
author_facet	Rivas,C. Navarro,N. Huovinen,P. Gómez,I.
author_sort	Rivas,C.
title	Photosynthetic UV stress tolerance of the Antarctic snow alga Chlorella sp. modified by enhanced temperature?
title_short	Photosynthetic UV stress tolerance of the Antarctic snow alga Chlorella sp. modified by enhanced temperature?
title_full	Photosynthetic UV stress tolerance of the Antarctic snow alga Chlorella sp. modified by enhanced temperature?
title_fullStr	Photosynthetic UV stress tolerance of the Antarctic snow alga Chlorella sp. modified by enhanced temperature?
title_full_unstemmed	Photosynthetic UV stress tolerance of the Antarctic snow alga Chlorella sp. modified by enhanced temperature?
title_sort	photosynthetic uv stress tolerance of the antarctic snow alga chlorella sp. modified by enhanced temperature?
publisher	Sociedad de Biología de Chile
publishDate	2016
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2016000100006
work_keys_str_mv	AT rivasc photosyntheticuvstresstoleranceoftheantarcticsnowalgachlorellaspmodifiedbyenhancedtemperature AT navarron photosyntheticuvstresstoleranceoftheantarcticsnowalgachlorellaspmodifiedbyenhancedtemperature AT huovinenp photosyntheticuvstresstoleranceoftheantarcticsnowalgachlorellaspmodifiedbyenhancedtemperature AT gomezi photosyntheticuvstresstoleranceoftheantarcticsnowalgachlorellaspmodifiedbyenhancedtemperature
_version_	1718439701985099776

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

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