English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/28356
Share/Impact:
Statistics
logo share SHARE   Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

Pigment composition of Heterocapsa sp. and Thalassiosira weissflogii growing in batch cultures under different irradiances

Other TitlesComposición pigmentaria de Heterocapsa sp. y Thalassiosira weissflogii en cultivos discontinuos sometidos a diferentes irradiancias
AuthorsLatasa, Mikel
KeywordsDiatom
Dinoflagellate
Light intensity
Xanthophylls
Diatoxanthin
HPLC
Diatomea
Dinoflagelado
Intensidad lumínica
Xantofilas
Diatoxantina
Issue DateMar-1995
PublisherConsejo Superior de Investigaciones Científicas (España)
CitationScientia Marina 59(1): 25-37 (1995)
Abstract[EN] An increase in the ratio of carotenoids/chlorophylls has been widely used as an indicator of light or nutrient stress in phytoplankton. An experiment was carried out to examine the changes of pigment composition in a dinoflagellate, Heterocapsa sp., and a diatom, Thalassiosira weissflogii grown in batch cultures under high (15 0 mmol m-2 s-1) and low (50 mmol m-2 s-1) irradiances. During the exponential growth phase, the cell content of the pigments involved in light harvesting functions such as fucoxanthin, peridinin, chlorophyll c, and chlorophyll a, was higher in cells cultured under lower irradiances. Diadinoxanthin concentration, however, was higher in cells cultured under higher irradiances, which supports a photoprotective role for this pigment. The shift from the exponential to the stationary phase (likely to be a result of nutrient starvation) produced a more drastic pigment loss in cells growing in the high irradiance cultures. As an exception, diatoxanthin showed an important increase, independent of irradiance and especially in T. weissflogii, when cells progressed from the exponential to the stationary phase. This result suggests that this pigment could be used as an indicator of nutrient starvation. In general, pigment ratios were more affected by the nutrient condition of the cells than by the different irradiances
[ES] El incremento del cociente carotenoides/clorofilas ha sido comúnmente usado como un indicador del grado de estrés de luz o nutrientes del fitoplancton. Se ha llevado a cabo un experimento para examinar los cambios que sufre la composición pigmentaria de un dinoflagelado. Heterocapsa sp., y una diatomea. Thalassiosira weissflogii, creciendo en cultivos cerrados bajo altas (15 0 mmol m-2 s-1) y bajas (50 mmol m-2 s-1) condiciones de irradiancia. La concentración celular de los pigmentos recolectores de luz (fucoxantina. peridinina, clorofila c. y clorofila a) fue más alta en las células sometidas a baja irradiancia. Por el contrario, la concentración de diadinoxantina fue mayor en las células que crecíán a alta irradiancia, lo cual confirma su papel fotoprotector. El paso de fase exponencial a fase estacionaria (probablemente como consecuencia de un agotamiento de nutrientes) produjo una mayor pérdida de pigmentos en las células que crecían bajo alta irradiancia
Description13 páginas, 5 figuras
Publisher version (URL)http://www.icm.csic.es/scimar/index.php/secId/6/IdArt/2711/
URIhttp://hdl.handle.net/10261/28356
ISSN0214-8358
E-ISSN1886-8134
Appears in Collections:(ICM) Artículos
Files in This Item:
File Description SizeFormat 
Latasa_1995.pdf13,59 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.