Effect of irradiance and nitrate levels on the relationship between gross photosynthesis and electron transport rate in the seagrass Cymodocea nodosa

Effect of irradiance and nitrate levels on the relationship between gross photosynthesis and electron transport rate in the seagrass Cymodocea nodosa

The relationship between gross photosynthesis (GPS) and electron transport rate (ETR) in marine algae has been shown to vary as a function of irradiance; however, little is known about the effect of nutrients on the this relationship in seagrasses. The objective of this study was to evaluate the eff...

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التفاصيل البيبلوغرافية
المؤلفون الرئيسيون: Cabello-Pasini, Alejandro, Abdala-Díaz, Roberto T, Macías-Carranza, Víctor, Figueroa, Félix L
التنسيق: info:eu-repo/semantics/article
اللغة:eng
منشور في: Iniversidad Autónoma de Baja California 2015
الوصول للمادة أونلاين:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2499
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id repositorioinstitucional-20.500.12930-7483
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institution Repositorio Institucional
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language eng
description The relationship between gross photosynthesis (GPS) and electron transport rate (ETR) in marine algae has been shown to vary as a function of irradiance; however, little is known about the effect of nutrients on the this relationship in seagrasses. The objective of this study was to evaluate the effect of nitrate concentration on the GPS (measured as O2 evolution) vs ETR (estimated by fluorescence quenching analysis) relationship of the seagrass Cymodocea nodosa from the Spanish Mediterranean Sea. Carbon levels in the tissue increased 6.5% when nitrate in the culture medium augmented from 0 to 100 µM. Nitrogen in the tissue, however, increased more than 60% when nitrate concentration in the medium reached 100 µM. Chlorophyll a + b levels increased approximately 30%, while absorptance augmented 15% when nitrate increased from 0 to 100 µM. In general, maximum oxygenic photosynthesis and maximum ETR values increased when nitrate in the medium increased. The relationship between GPS and ETR did not show a linear response at low nitrate levels and high irradiances. In contrast, a linear relationship was observed at nitrate levels above 50 µM, even at high irradiances. The results from this study suggest that the lack of correlation between ETR and GPS is the result of low nitrogen levels in the tissue of marine macrophytes. They also suggest that seasonal fluctuations in nitrate levels or nitrogen pulses, such as those observed during upwelling events, may affect the relationship between GPS and ETR in C. nodosa or other marine macrophytes. 
format info:eu-repo/semantics/article
author Cabello-Pasini, Alejandro
Abdala-Díaz, Roberto T
Macías-Carranza, Víctor
Figueroa, Félix L
spellingShingle Cabello-Pasini, Alejandro
Abdala-Díaz, Roberto T
Macías-Carranza, Víctor
Figueroa, Félix L
Effect of irradiance and nitrate levels on the relationship between gross photosynthesis and electron transport rate in the seagrass Cymodocea nodosa
author_facet Cabello-Pasini, Alejandro
Abdala-Díaz, Roberto T
Macías-Carranza, Víctor
Figueroa, Félix L
author_sort Cabello-Pasini, Alejandro
title Effect of irradiance and nitrate levels on the relationship between gross photosynthesis and electron transport rate in the seagrass Cymodocea nodosa
title_short Effect of irradiance and nitrate levels on the relationship between gross photosynthesis and electron transport rate in the seagrass Cymodocea nodosa
title_full Effect of irradiance and nitrate levels on the relationship between gross photosynthesis and electron transport rate in the seagrass Cymodocea nodosa
title_fullStr Effect of irradiance and nitrate levels on the relationship between gross photosynthesis and electron transport rate in the seagrass Cymodocea nodosa
title_full_unstemmed Effect of irradiance and nitrate levels on the relationship between gross photosynthesis and electron transport rate in the seagrass Cymodocea nodosa
title_sort effect of irradiance and nitrate levels on the relationship between gross photosynthesis and electron transport rate in the seagrass cymodocea nodosa
publisher Iniversidad Autónoma de Baja California
publishDate 2015
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2499
_version_ 1792610214106628096
spelling repositorioinstitucional-20.500.12930-74832023-05-09T14:30:57Z Effect of irradiance and nitrate levels on the relationship between gross photosynthesis and electron transport rate in the seagrass Cymodocea nodosa Efecto de la irradiancia y la concentración de nitrógeno en la relación entre la fotosíntesis bruta y la tasa de transporte electrónico en la fanerógama marina Cymodocea nodosa Cabello-Pasini, Alejandro Abdala-Díaz, Roberto T Macías-Carranza, Víctor Figueroa, Félix L The relationship between gross photosynthesis (GPS) and electron transport rate (ETR) in marine algae has been shown to vary as a function of irradiance; however, little is known about the effect of nutrients on the this relationship in seagrasses. The objective of this study was to evaluate the effect of nitrate concentration on the GPS (measured as O2 evolution) vs ETR (estimated by fluorescence quenching analysis) relationship of the seagrass Cymodocea nodosa from the Spanish Mediterranean Sea. Carbon levels in the tissue increased 6.5% when nitrate in the culture medium augmented from 0 to 100 µM. Nitrogen in the tissue, however, increased more than 60% when nitrate concentration in the medium reached 100 µM. Chlorophyll a + b levels increased approximately 30%, while absorptance augmented 15% when nitrate increased from 0 to 100 µM. In general, maximum oxygenic photosynthesis and maximum ETR values increased when nitrate in the medium increased. The relationship between GPS and ETR did not show a linear response at low nitrate levels and high irradiances. In contrast, a linear relationship was observed at nitrate levels above 50 µM, even at high irradiances. The results from this study suggest that the lack of correlation between ETR and GPS is the result of low nitrogen levels in the tissue of marine macrophytes. They also suggest that seasonal fluctuations in nitrate levels or nitrogen pulses, such as those observed during upwelling events, may affect the relationship between GPS and ETR in C. nodosa or other marine macrophytes.  La relación entre la fotosíntesis bruta (FB) y la tasa de transporte electrónico (TTE) en algas marinas varía en función de la irradiancia; sin embargo, poco se sabe sobre el efecto de la concentración de nutrientes sobre la relación entre FB y TTE en fanerógamas marinas. El objetivo de este estudio fue evaluar el efecto de la concentración de nitrato sobre la relación FB (determinada como evolución de O2) vs TTE (estimada mediante análisis de fluorescencia) en la fanerógama marina Cymodocea nodosa de la costa del Mediterráneo español. Los niveles de carbono en el tejido incrementaron 6.5% cuando el nitrato del medio aumentó de 0 a 100 µM. En contraste, los niveles de nitrógeno en el tejido aumentaron más de 60% cuando los niveles de nitrato alcanzaron 100 µM. Los niveles de clorofila a + b incrementaron aproximadamente 30%, mientras que la absorptancia aumentó 15% cuando el nitrato aumentó de 0 a 100 µM. En general, los valores de fotosíntesis máxima (O2) y los valores de TTE máxima incrementaron cuando los niveles de nitrato aumentaron en el medio. La relación entre FB y TTE no mostró una respuesta lineal a bajas concentraciones de nitrato en el medio y a altas irradiancias. En contraste, una relación lineal fue observada cuando los niveles de nitrato fueron mayores a 50 µM, aun a altas irradiancias. Los resultados de este estudio sugieren que la falta de correlación entre FB y TTE es el resultado de los bajos niveles de nitrógeno en el tejido de macrófitos marinos. Los resultados sugieren también que fluctuaciones estacionales de los niveles de nitrato o pulsos de nitrógeno, como los observados durante eventos de surgencia, podrían afectar la relación entre FB y TTE en C. nodosa y otras macrófitos marinos. 2015-06-12 2021-06-03T03:55:26Z 2021-06-03T03:55:26Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2499 10.7773/cm.v41i2.2499 https://hdl.handle.net/20.500.12930/7483 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2499/1553 Copyright (c) 2015 Ciencias Marinas application/pdf Iniversidad Autónoma de Baja California Ciencias Marinas; Vol. 41 No. 2 (2015); 93-105 Ciencias Marinas; Vol. 41 Núm. 2 (2015); 93-105 2395-9053 0185-3880

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