Photosynthetic responses of<i>Halimeda scabra</i>(Chlorophyta, Bryopsidales) to interactive effects of temperature, pH, and nutrients and its carbon pathways

Zuñiga-Rios, Daily; Vásquez-Elizondo, Román Manuel; Caamal, Edgar; Robledo, Daniel

doi:10.7717/peerj.10958

Cited by 6 publications

(2 citation statements)

References 69 publications

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“…Filtered and sterilized seawater (pH 8.2–8.6) with ammonia, nitrite, nitrate, and orthophosphate contents of 3.19 ± 0.15 μM, 0.71 ± 0.006 μM, 67.9 ± 0.35 μM, and 9.6 ± 0.16 μM, respectively, was used for experiments (Zuñiga‐Rios et al . 2021).…”

Section: Methodsmentioning

confidence: 99%

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Growth and photosynthetic physiology of holopelagic Sargassum (Phaeophyceae) under laboratory conditions

Vásquez‐Elizondo,

Vázquez‐Delfín,

Robledo

2023

Phycological Research

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SummarySpecies of holopelagic Sargassum are responsible for Caribbean golden tides, commonly known as ‘Sargassum events’. These events mainly comprise Sargassum fluitans and Sargassum natans I, which are exposed to high levels of irradiance, but also self‐shading within their floating masses. In this study, we grew S. fluitans and S. natans I and acclimated them to low‐light conditions at 23°C in the laboratory to explore their responses to increasing light intensities. Photosynthesis, respiration, growth, and pigment content were evaluated over 3 weeks. S. fluitans and S. natans I photoacclimate to higher irradiances by decreasing their chlorophyll a and c contents. An increase in maximum photosynthesis and respiration rates was observed under high light, although differences occurred in the saturation irradiance and the initial slope of the photosynthesis versus irradiance curve. These adjustments were reflected in S. fluitans daily growth (from 2% to 7% d−1 at low to high light, respectively) and tissue nitrogen content (1.6–2.7%) but were absent in S. natans I (~1% d−1). The photosynthetic physiology of S. fluitans under these conditions suggests lower light requirements without compromising growth; however, under high light a higher photosynthetic performance was observed. Combining physiological and growth studies in holopelagic Sargassum species will serve as a baseline to understand and explain the success and overgrowth of these species along the Caribbean coast.

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Section: Methodsmentioning

confidence: 99%

“…AE 0.15 μM, 0.71 AE 0.006 μM, 67.9 AE 0.35 μM, and 9.6 AE 0.16 μM, respectively, was used for experiments(Zuñiga-Rios et al 2021).…”

mentioning

confidence: 99%

Growth and photosynthetic physiology of holopelagic Sargassum (Phaeophyceae) under laboratory conditions

Vásquez‐Elizondo,

Vázquez‐Delfín,

Robledo

2023

Phycological Research

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Effects of temperature and salinity on indoor preservation of in vitro holdfast of Sargassum fusiforme

Xu,

Cao,

Tian

et al. 2024

Aquacult Int

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The contribution of biophysical and biochemical CO2 concentration mechanisms to the carbon fixation of the green macroalga Ulva prolifera

Zhang,

Gao,

Gao

et al. 2024

Mar Life Sci Technol

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CO2 concentration mechanisms (CCMs) are important in maintaining the high efficiency of photosynthesis of marine algae. Aquatic photoautotrophs have two types of CCMs: biophysical CCMs, based on the conversion of inorganic carbon, and biochemical CCMs, based on the formation of C4 acid intermediates. However, the contribution of biophysical and biochemical CCMs to algal carbon fixation remains unclear. Here, we used ethoxyzolamide (EZ) inhibitors of carbonic anhydrase and 3-mercaptopicolinic acid (MPA) inhibitors for phosphoenolpyruvate carboxykinase to examine the importance of biophysical and biochemical CCMs in photosynthesis of the green macroalga Ulva prolifera. The culture experiments showed that the carbon fixation of the species declined when EZ inhibited the biophysical CCM, while the increase in cyclic electron flow around the photosystem I indicated a more active biochemical CCM, contributing to ~ 50% of total carbon fixation. The biophysical CCM was also reinforced when MPA inhibited the biochemical CCM. In a comparison, the biophysical CCM can compensate for almost 100% of total carbon fixation. The results indicate that biophysical CCMs dominate the process of carbon fixation of U. prolifera while biochemical CCM plays a supporting role. Our results provide evidence of a complementary coordination mechanism between the biophysical and biochemical CCMs that promotes the efficiency of photosynthesis of U. prolifera, an efficient mechanism to boost the alga’s bloom.

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Photosynthetic responses ofHalimeda scabra(Chlorophyta, Bryopsidales) to interactive effects of temperature, pH, and nutrients and its carbon pathways

Cited by 6 publications

References 69 publications

Growth and photosynthetic physiology of holopelagic Sargassum (Phaeophyceae) under laboratory conditions

Growth and photosynthetic physiology of holopelagic Sargassum (Phaeophyceae) under laboratory conditions

Effects of temperature and salinity on indoor preservation of in vitro holdfast of Sargassum fusiforme

The contribution of biophysical and biochemical CO2 concentration mechanisms to the carbon fixation of the green macroalga Ulva prolifera

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