Effect of irradiance on growth, photosynthesis, pigment content and nutrient consumption in dense cultures of Rhodomonas salina (Wislouch) (Cryptophyceae)

Effect of irradiance on growth, photosynthesis, pigment content and nutrient consumption in dense cultures of Rhodomonas salina (Wislouch) (Cryptophyceae)

 The effects of different incident irradiances on growth, photosynthesis, pigment content and nutrient uptake were studied in dense cultures of the cryptophyte Rhodomonas salina (Wislouch) Hill y Wetherbee. Cells were grown for ten days at different incident irradiances: 11, 33, 75, 260 and...

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Autores principales: Bartual, A, Lubián, LM, Gálvez, JA, Niell, FX
Formato: Online
Lenguaje:eng
Publicado: Iniversidad Autónoma de Baja California 2002
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/236
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id oai:cienciasmarinas.com.mx:article-236
record_format ojs
institution Ciencias Marinas
collection OJS
language eng
format Online
author Bartual, A
Lubián, LM
Gálvez, JA
Niell, FX
spellingShingle Bartual, A
Lubián, LM
Gálvez, JA
Niell, FX
Effect of irradiance on growth, photosynthesis, pigment content and nutrient consumption in dense cultures of Rhodomonas salina (Wislouch) (Cryptophyceae)
author_facet Bartual, A
Lubián, LM
Gálvez, JA
Niell, FX
author_sort Bartual, A
title Effect of irradiance on growth, photosynthesis, pigment content and nutrient consumption in dense cultures of Rhodomonas salina (Wislouch) (Cryptophyceae)
title_short Effect of irradiance on growth, photosynthesis, pigment content and nutrient consumption in dense cultures of Rhodomonas salina (Wislouch) (Cryptophyceae)
title_full Effect of irradiance on growth, photosynthesis, pigment content and nutrient consumption in dense cultures of Rhodomonas salina (Wislouch) (Cryptophyceae)
title_fullStr Effect of irradiance on growth, photosynthesis, pigment content and nutrient consumption in dense cultures of Rhodomonas salina (Wislouch) (Cryptophyceae)
title_full_unstemmed Effect of irradiance on growth, photosynthesis, pigment content and nutrient consumption in dense cultures of Rhodomonas salina (Wislouch) (Cryptophyceae)
title_sort effect of irradiance on growth, photosynthesis, pigment content and nutrient consumption in dense cultures of rhodomonas salina (wislouch) (cryptophyceae)
description  The effects of different incident irradiances on growth, photosynthesis, pigment content and nutrient uptake were studied in dense cultures of the cryptophyte Rhodomonas salina (Wislouch) Hill y Wetherbee. Cells were grown for ten days at different incident irradiances: 11, 33, 75, 260 and 320 µmol photon m-2s-1. The average pigment content (phycoerythrin and chlorophyll a) was lower when cells were grown at high irradiances (260 and 320 µmol photon m-2s-1) compared with cells grown under low irradiances (11, 33 and 75 µmol photon m-2s-1).The maximum photosynthetic rate (Pmax) was maximal at 75 µmol photon m-2s-1 , decreasing considerably at the highest irradiance in which apparent photosynthetic efficiency per cell and per chlorophyll a unit (αcell and αchla) also decreased. Results showed that dense cultures of R. salina grew optimally in a range between 75 and 260 µmol photon m-2s-1 with optimal photosynthetic performance at 75 µmol photon m-2s-1. Nitrogen and phosphorus depletion occurred as a consequence of the exponential growth, except under the lowest and the highest irradiances (11 and 320 µmol photon m-2s-1, respectively). Associated to N-limitation, phycoerythrin (PE) and chlorophyll a decreased considerably. It is suggested that R.salina responds to nitrogen-depleted conditions by mobilizing nitrogen from PE, this behaviour being modelled by a relationship between external nitrogen availability and PE mobilization.
publisher Iniversidad Autónoma de Baja California
publishDate 2002
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/236
_version_ 1715723945600090112
spelling oai:cienciasmarinas.com.mx:article-2362019-04-29T22:53:28Z Effect of irradiance on growth, photosynthesis, pigment content and nutrient consumption in dense cultures of Rhodomonas salina (Wislouch) (Cryptophyceae) Efecto de la irradiancia en el crecimiento, fotosíntesis, contenido pigmentario y consumo de nutrientes en cultivos densos de Rhodomonas salina (Wislouch) (Cryptophyceae) Bartual, A Lubián, LM Gálvez, JA Niell, FX Cryptophyceae photoacclimation phycoerythrin P-I curves Rhodomonas salina Cryptophyceae fotoaclimatación ficoeritrina curvas P-I Rhodomonas salina  The effects of different incident irradiances on growth, photosynthesis, pigment content and nutrient uptake were studied in dense cultures of the cryptophyte Rhodomonas salina (Wislouch) Hill y Wetherbee. Cells were grown for ten days at different incident irradiances: 11, 33, 75, 260 and 320 µmol photon m-2s-1. The average pigment content (phycoerythrin and chlorophyll a) was lower when cells were grown at high irradiances (260 and 320 µmol photon m-2s-1) compared with cells grown under low irradiances (11, 33 and 75 µmol photon m-2s-1).The maximum photosynthetic rate (Pmax) was maximal at 75 µmol photon m-2s-1 , decreasing considerably at the highest irradiance in which apparent photosynthetic efficiency per cell and per chlorophyll a unit (αcell and αchla) also decreased. Results showed that dense cultures of R. salina grew optimally in a range between 75 and 260 µmol photon m-2s-1 with optimal photosynthetic performance at 75 µmol photon m-2s-1. Nitrogen and phosphorus depletion occurred as a consequence of the exponential growth, except under the lowest and the highest irradiances (11 and 320 µmol photon m-2s-1, respectively). Associated to N-limitation, phycoerythrin (PE) and chlorophyll a decreased considerably. It is suggested that R.salina responds to nitrogen-depleted conditions by mobilizing nitrogen from PE, this behaviour being modelled by a relationship between external nitrogen availability and PE mobilization. En este trabajo se analizan los efectos que diferentes irradiancias incidentes tienen en el crecimiento, características fotosintéticas, contenido pigmentario e incorporación de nutrientes en cultivos densos de la criptofita Rhodomonas salina (Wislouch) Hill y Wetherbee. Con tal fin, se mantuvieron cultivos durante diez días bajo distintas condiciones de luz incidente: 11, 33, 75, 260 y 320 µmol fotón m-2s-1. El contenido pigmentario promedio (ficoeritrina y clorofila a) fue menor en células adaptadas a las mayores irradiancias (260 y 320 µmol fotón m-2s-1) en comparación con las adaptadas a las irradiancias menores (11, 33 y 75 µmol fotón m-2s-1). El valor máximo de fotosíntesis (Pmax) se obtuvo para las células adaptadas a 75 µmol fotón m-2s-1, decreciendo considerablemente para la irradiancia máxima ensayada en la que también la eficiencia fotosintética (αcel. and αcla) fue menor. Los resultados muestran que esta criptofita crece óptimamente en cultivos densos en un rango de irradiancias incidentes entre 75 y 260 µmol fotón m-2s-1, con una actividad fotosintética óptima a 75 µmol fotón m-2s-1. Como consecuencia del crecimiento exponencial de los cultivos, se produjo una desaparición paulatina y prácticamente total del nitrógeno y el fósforo del medio, excepto en los cultivos adaptados a las irradiancias máxima (320 µmol fotón m-2s-1) y minima (11 µmol fotón m-2s-1) empleadas. Asociada a tales condiciones de limitación de nitrógeno se observó una disminución del contenido celular de ficoeritrina y clorofila a, definiéndose una clara relación entre la disponibilidad de nitrógeno externo y la tasa de desaparición de ficoeritrina. Estos resultados sugieren que Rhodomonas salina es capaz de movilizar el nitrógeno asociado a la ficoeritrina como respuesta ante condiciones de baja disponibilidad de dicho nutriente. Iniversidad Autónoma de Baja California 2002-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/236 10.7773/cm.v28i4.236 Ciencias Marinas; Vol. 28 No. 4 (2002); 381-392 Ciencias Marinas; Vol. 28 Núm. 4 (2002); 381-392 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/236/200

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