Effects of irradiance and nitrate on photosynthesis in the seagrass Cymodocea nodosa

Effects of irradiance and nitrate on photosynthesis in the seagrass Cymodocea nodosa

The effects of temperature, irradiance, and other environmental variables on photosynthesis in seagrasses are well understood. However, little information is available regarding the effects of the nitrate concentration in seawater on the photosynthetic characteristics of marine vegetation. Thus, the...

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Autores principales: Cabello-Pasini, Alejandro, Sandoval-Gil, Jose M, Muñiz-Salazar, Raquel, Macias-Carranza, Víctor, Figueroa, Félix L
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語言:eng
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出版: Iniversidad Autónoma de Baja California 2023
在線閱讀:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3300
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id oai:cienciasmarinas.com.mx:article-3300
record_format ojs
institution Ciencias Marinas
collection OJS
language eng
spa
format Online
author Cabello-Pasini, Alejandro
Sandoval-Gil, Jose M
Muñiz-Salazar, Raquel
Macias-Carranza, Víctor
Figueroa, Félix L
spellingShingle Cabello-Pasini, Alejandro
Sandoval-Gil, Jose M
Muñiz-Salazar, Raquel
Macias-Carranza, Víctor
Figueroa, Félix L
Effects of irradiance and nitrate on photosynthesis in the seagrass Cymodocea nodosa
author_facet Cabello-Pasini, Alejandro
Sandoval-Gil, Jose M
Muñiz-Salazar, Raquel
Macias-Carranza, Víctor
Figueroa, Félix L
author_sort Cabello-Pasini, Alejandro
title Effects of irradiance and nitrate on photosynthesis in the seagrass Cymodocea nodosa
title_short Effects of irradiance and nitrate on photosynthesis in the seagrass Cymodocea nodosa
title_full Effects of irradiance and nitrate on photosynthesis in the seagrass Cymodocea nodosa
title_fullStr Effects of irradiance and nitrate on photosynthesis in the seagrass Cymodocea nodosa
title_full_unstemmed Effects of irradiance and nitrate on photosynthesis in the seagrass Cymodocea nodosa
title_sort effects of irradiance and nitrate on photosynthesis in the seagrass cymodocea nodosa
description The effects of temperature, irradiance, and other environmental variables on photosynthesis in seagrasses are well understood. However, little information is available regarding the effects of the nitrate concentration in seawater on the photosynthetic characteristics of marine vegetation. Thus, the aim of this study was to determine the effect of the nitrate concentration in seawater on the effective quantum yield of the seagrass Cymodocea nodosa. Cymodocea nodosa shoots were incubated under different irradiance levels and with different nitrate concentrations. In contrast, a decrease in transmittance and an exponential increase in the absorptance of the shoots were observed as a function of increasing nitrate levels. Furthermore, the effective quantum yield of photosystem II (ΦPSII) in C. nodosa shoots increased exponentially as the nitrate concentration in the media increased. The ΦPSII values in the shoots decreased as irradiance increased and reached minimum values at solar noon or 2 h afterward. However, the decrease of ΦPSII values was 4-fold greater in shoots incubated under full solar radiation (100% natural incident irradiance, Eo) compared to those of shoots incubated with 20% Eo. The ΦPSII values decreased to almost zero in shoots pre-incubated with no nitrate (0 μM NO3–), whereas ΦPSII values in shoots pre incubated with 25 and 100 μM NO3– decreased by approximately 25% of their initial values. Collectively, these results indicate that nitrogen levels in seawater regulate the effective quantum yield values of C. nodosa, which suggests that the photosynthetic characteristics of this seagrass might be regulated by fluctuating nitrate levels in the water column such as those that are observed in upwelling regions.
publisher Iniversidad Autónoma de Baja California
publishDate 2023
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3300
_version_ 1792095479822024704
spelling oai:cienciasmarinas.com.mx:article-33002024-02-08T22:54:21Z Effects of irradiance and nitrate on photosynthesis in the seagrass Cymodocea nodosa Efectos de la irradiación y el nitrato sobre la fotosíntesis en el pasto marino Cymodocea nodosa Cabello-Pasini, Alejandro Sandoval-Gil, Jose M Muñiz-Salazar, Raquel Macias-Carranza, Víctor Figueroa, Félix L Cymodocea nodosa in vivo chlorophyll a fluorescence nitrate photosynthesis seagrass Cymodocea nodosa clorofila a in vivo fluorescencia nitrato fotosíntesis pasto marino The effects of temperature, irradiance, and other environmental variables on photosynthesis in seagrasses are well understood. However, little information is available regarding the effects of the nitrate concentration in seawater on the photosynthetic characteristics of marine vegetation. Thus, the aim of this study was to determine the effect of the nitrate concentration in seawater on the effective quantum yield of the seagrass Cymodocea nodosa. Cymodocea nodosa shoots were incubated under different irradiance levels and with different nitrate concentrations. In contrast, a decrease in transmittance and an exponential increase in the absorptance of the shoots were observed as a function of increasing nitrate levels. Furthermore, the effective quantum yield of photosystem II (ΦPSII) in C. nodosa shoots increased exponentially as the nitrate concentration in the media increased. The ΦPSII values in the shoots decreased as irradiance increased and reached minimum values at solar noon or 2 h afterward. However, the decrease of ΦPSII values was 4-fold greater in shoots incubated under full solar radiation (100% natural incident irradiance, Eo) compared to those of shoots incubated with 20% Eo. The ΦPSII values decreased to almost zero in shoots pre-incubated with no nitrate (0 μM NO3–), whereas ΦPSII values in shoots pre incubated with 25 and 100 μM NO3– decreased by approximately 25% of their initial values. Collectively, these results indicate that nitrogen levels in seawater regulate the effective quantum yield values of C. nodosa, which suggests that the photosynthetic characteristics of this seagrass might be regulated by fluctuating nitrate levels in the water column such as those that are observed in upwelling regions. Los efectos de la temperatura, la irradiancia y otras variables ambientales sobre la fotosíntesis en los pastos marinos son bien conocidos. Sin embargo, existe poca información sobre los efectos del nitrato en el agua marina sobre las características fotosintéticas de los macrófitos marinos. En este estudio, se planteó determinar el efecto de la concentración de nitrato en el agua marina sobre el rendimiento cuántico efectivo del pasto marino Cymodocea nodosa. Los haces de C. nodosa se incubaron con diferentes concentraciones de nitrato y bajo diferentes niveles de irradiancia. En contraste, hubo una disminución de la transmitancia y un aumento exponencial de la absortancia de los haces en función del aumento de los niveles de nitrato. Además, el rendimiento cuántico efectivo del fotosistema II (ΦFSII) en los haces de C. nodosa aumentó exponencialmente al aumentar la concentración de nitrato en el medio. Los valores de ΦFSII en los haces disminuyeron a medida que aumentaba la irradiancia y alcanzaron valores mínimos al mediodía solar o 2 h después. Esta disminución en los valores de ΦFSII, sin embargo, fue 4 veces mayor en los haces incubados bajo radiación solar completa (100% de Eo) en comparación con los incubados con 20% de Eo. Los valores de ΦFSII disminuyeron a casi cero en los haces pre-incubados con 0 μM de NO3–, mientras que los valores de ΦFSII en los haces pre-incubados con 25 y 100 μM de NO3– disminuyeron aproximadamente un 25% de sus valores iniciales. Estos resultados indican que los niveles de nitrógeno en el agua marina regulan los valores del rendimiento cuántico efectivo de C. nodosa, lo que sugiere que las características fotosintéticas de este pasto marino podrían estar reguladas por los niveles fluctuantes de nitrato en la columna de agua como aquellos observados en las regiones de surgencia. Iniversidad Autónoma de Baja California 2023-05-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf text/xml text/xml https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3300 10.7773/cm.y2023.3300 Ciencias Marinas; Vol. 49 (2023) Ciencias Marinas; Vol. 49 (2023) 2395-9053 0185-3880 eng spa https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3300/420420725 https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3300/420420844 https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3300/420420845 Copyright (c) 2023 Alejandro Cabello-Pasini, Jose M Saldoval-Gil, Raquel Muñiz-Salazar, Víctor Macias-Carranza, Félix L Figueroa https://creativecommons.org/licenses/by/4.0

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