Photosynthetic responses of Emiliania huxleyi to UV radiation and elevated temperature: Roles of calcified coccoliths

Autores
Xu, K.; Gao, K.; Villafañe, Virginia Estela; Helbling, Eduardo Walter
Año de publicación
2011
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Changes in calcification of coccolithophores may affect their photosynthetic responses to both, ultraviolet radiation (UVR, 280-400 nm) and temperature. We operated semi-continuous cultures of Emiliania huxleyi (strain CS-369) at reduced (0.1 mM, LCa) and ambient (10 mM, HCa) Ca2+ concentrations and, after 148 generations, we exposed cells to six radiation treatments (>280, >295, >305, >320, >350 and >395 nm by using Schott filters) and two temperatures (20 and 25 °C) to examine photosynthesis and calcification responses. Overall, our study demonstrated that: (1) decreased calcification resulted in a down regulation of photoprotective mechanisms (i.e., as estimated via non-photochemical quenching, NPQ), pigments contents and photosynthetic carbon fixation; (2) calcification (C) and photosynthesis (P) (as well as their ratio) have different responses related to UVR with cells grown under the high Ca2+ concentration being more resistant to UVR than those grown under the low Ca2+ level; (3) elevated temperature increased photosynthesis and calcification of E. huxleyi grown at high Ca2+ concentrations whereas decreased both processes in low Ca2+ grown cells. Therefore, a decrease in calcification rates in E. huxleyi is expected to decrease photosynthesis rates, resulting in a negative feedback that further reduces calcification.
Fil: Xu, K.. Xiamen University; China
Fil: Gao, K.. Xiamen University; China
Fil: Villafañe, Virginia Estela. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Fundación Playa Unión; Argentina
Fil: Helbling, Eduardo Walter. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Fundación Playa Unión; Argentina
Materia
TEMPERATURE
UVR
COCCOLITHS
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/83493
Acceder
id CONICETDig_83c3a03a8b310b56762c82f3821091c9
oai_identifier_str oai:ri.conicet.gov.ar:11336/83493
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Photosynthetic responses of Emiliania huxleyi to UV radiation and elevated temperature: Roles of calcified coccolithsXu, K.Gao, K.Villafañe, Virginia EstelaHelbling, Eduardo WalterTEMPERATUREUVRCOCCOLITHShttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Changes in calcification of coccolithophores may affect their photosynthetic responses to both, ultraviolet radiation (UVR, 280-400 nm) and temperature. We operated semi-continuous cultures of Emiliania huxleyi (strain CS-369) at reduced (0.1 mM, LCa) and ambient (10 mM, HCa) Ca2+ concentrations and, after 148 generations, we exposed cells to six radiation treatments (>280, >295, >305, >320, >350 and >395 nm by using Schott filters) and two temperatures (20 and 25 °C) to examine photosynthesis and calcification responses. Overall, our study demonstrated that: (1) decreased calcification resulted in a down regulation of photoprotective mechanisms (i.e., as estimated via non-photochemical quenching, NPQ), pigments contents and photosynthetic carbon fixation; (2) calcification (C) and photosynthesis (P) (as well as their ratio) have different responses related to UVR with cells grown under the high Ca2+ concentration being more resistant to UVR than those grown under the low Ca2+ level; (3) elevated temperature increased photosynthesis and calcification of E. huxleyi grown at high Ca2+ concentrations whereas decreased both processes in low Ca2+ grown cells. Therefore, a decrease in calcification rates in E. huxleyi is expected to decrease photosynthesis rates, resulting in a negative feedback that further reduces calcification.Fil: Xu, K.. Xiamen University; ChinaFil: Gao, K.. Xiamen University; ChinaFil: Villafañe, Virginia Estela. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Fundación Playa Unión; ArgentinaFil: Helbling, Eduardo Walter. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Fundación Playa Unión; ArgentinaCopernicus Publications2011-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/83493Xu, K.; Gao, K.; Villafañe, Virginia Estela; Helbling, Eduardo Walter; Photosynthetic responses of Emiliania huxleyi to UV radiation and elevated temperature: Roles of calcified coccoliths; Copernicus Publications; Biogeosciences; 8; 6; 6-2011; 1441-14521726-41701726-4189CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.biogeosciences.net/8/1441/2011/info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-8-1441-2011info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:47:34Zoai:ri.conicet.gov.ar:11336/83493instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 09:47:35.226CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Photosynthetic responses of Emiliania huxleyi to UV radiation and elevated temperature: Roles of calcified coccoliths
title Photosynthetic responses of Emiliania huxleyi to UV radiation and elevated temperature: Roles of calcified coccoliths
spellingShingle Photosynthetic responses of Emiliania huxleyi to UV radiation and elevated temperature: Roles of calcified coccoliths
Xu, K.
TEMPERATURE
UVR
COCCOLITHS
title_short Photosynthetic responses of Emiliania huxleyi to UV radiation and elevated temperature: Roles of calcified coccoliths
title_full Photosynthetic responses of Emiliania huxleyi to UV radiation and elevated temperature: Roles of calcified coccoliths
title_fullStr Photosynthetic responses of Emiliania huxleyi to UV radiation and elevated temperature: Roles of calcified coccoliths
title_full_unstemmed Photosynthetic responses of Emiliania huxleyi to UV radiation and elevated temperature: Roles of calcified coccoliths
title_sort Photosynthetic responses of Emiliania huxleyi to UV radiation and elevated temperature: Roles of calcified coccoliths
dc.creator.none.fl_str_mv Xu, K.
Gao, K.
Villafañe, Virginia Estela
Helbling, Eduardo Walter
author Xu, K.
author_facet Xu, K.
Gao, K.
Villafañe, Virginia Estela
Helbling, Eduardo Walter
author_role author
author2 Gao, K.
Villafañe, Virginia Estela
Helbling, Eduardo Walter
author2_role author
author
author
dc.subject.none.fl_str_mv TEMPERATURE
UVR
COCCOLITHS
topic TEMPERATURE
UVR
COCCOLITHS
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Changes in calcification of coccolithophores may affect their photosynthetic responses to both, ultraviolet radiation (UVR, 280-400 nm) and temperature. We operated semi-continuous cultures of Emiliania huxleyi (strain CS-369) at reduced (0.1 mM, LCa) and ambient (10 mM, HCa) Ca2+ concentrations and, after 148 generations, we exposed cells to six radiation treatments (>280, >295, >305, >320, >350 and >395 nm by using Schott filters) and two temperatures (20 and 25 °C) to examine photosynthesis and calcification responses. Overall, our study demonstrated that: (1) decreased calcification resulted in a down regulation of photoprotective mechanisms (i.e., as estimated via non-photochemical quenching, NPQ), pigments contents and photosynthetic carbon fixation; (2) calcification (C) and photosynthesis (P) (as well as their ratio) have different responses related to UVR with cells grown under the high Ca2+ concentration being more resistant to UVR than those grown under the low Ca2+ level; (3) elevated temperature increased photosynthesis and calcification of E. huxleyi grown at high Ca2+ concentrations whereas decreased both processes in low Ca2+ grown cells. Therefore, a decrease in calcification rates in E. huxleyi is expected to decrease photosynthesis rates, resulting in a negative feedback that further reduces calcification.
Fil: Xu, K.. Xiamen University; China
Fil: Gao, K.. Xiamen University; China
Fil: Villafañe, Virginia Estela. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Fundación Playa Unión; Argentina
Fil: Helbling, Eduardo Walter. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Fundación Playa Unión; Argentina
description Changes in calcification of coccolithophores may affect their photosynthetic responses to both, ultraviolet radiation (UVR, 280-400 nm) and temperature. We operated semi-continuous cultures of Emiliania huxleyi (strain CS-369) at reduced (0.1 mM, LCa) and ambient (10 mM, HCa) Ca2+ concentrations and, after 148 generations, we exposed cells to six radiation treatments (>280, >295, >305, >320, >350 and >395 nm by using Schott filters) and two temperatures (20 and 25 °C) to examine photosynthesis and calcification responses. Overall, our study demonstrated that: (1) decreased calcification resulted in a down regulation of photoprotective mechanisms (i.e., as estimated via non-photochemical quenching, NPQ), pigments contents and photosynthetic carbon fixation; (2) calcification (C) and photosynthesis (P) (as well as their ratio) have different responses related to UVR with cells grown under the high Ca2+ concentration being more resistant to UVR than those grown under the low Ca2+ level; (3) elevated temperature increased photosynthesis and calcification of E. huxleyi grown at high Ca2+ concentrations whereas decreased both processes in low Ca2+ grown cells. Therefore, a decrease in calcification rates in E. huxleyi is expected to decrease photosynthesis rates, resulting in a negative feedback that further reduces calcification.
publishDate 2011
dc.date.none.fl_str_mv 2011-06
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/83493
Xu, K.; Gao, K.; Villafañe, Virginia Estela; Helbling, Eduardo Walter; Photosynthetic responses of Emiliania huxleyi to UV radiation and elevated temperature: Roles of calcified coccoliths; Copernicus Publications; Biogeosciences; 8; 6; 6-2011; 1441-1452
1726-4170
1726-4189
CONICET Digital
CONICET
url http://hdl.handle.net/11336/83493
identifier_str_mv Xu, K.; Gao, K.; Villafañe, Virginia Estela; Helbling, Eduardo Walter; Photosynthetic responses of Emiliania huxleyi to UV radiation and elevated temperature: Roles of calcified coccoliths; Copernicus Publications; Biogeosciences; 8; 6; 6-2011; 1441-1452
1726-4170
1726-4189
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.biogeosciences.net/8/1441/2011/
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-8-1441-2011
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Copernicus Publications
publisher.none.fl_str_mv Copernicus Publications
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
_version_ 1842268869025071104
score 13.13397

Publicaciones similares