Artículo
Photosynthetic responses of Emiliania huxleyi to UV radiation and elevated temperature: Roles of calcified coccoliths
Fecha de publicación:
06/2011
Editorial:
Copernicus Publications
Revista:
Biogeosciences
ISSN:
1726-4170
e-ISSN:
1726-4189
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
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.
Palabras clave:
Temperature
,
Uvr
,
Coccoliths
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Articulos de SEDE CENTRAL
Citación
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
Compartir
Altmétricas