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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
Light intensity
Intensidad lumínica
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/
Appears in Collections:(ICM) Artículos
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