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Advances in Algal Photosynthesis and Phytochemistry
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Advances in Algal Photosynthesis and Phytochemistry

A special issue of Plants (ISSN 2223-7747). This special issue belongs to the section "Plant Physiology and Metabolism".

Deadline for manuscript submissions: 28 February 2025 | Viewed by 1919

Special Issue Editors

Dr. José Bonomi Barufi

E-Mail Website
Guest Editor
Botany Department, Federal University of Santa Catarina, Florianópolis 88040-900, SC, Brazil
Interests: photobiology; photosynthesis; ecophysiology; bioremediation
Dr. Nelso Navarro

E-Mail Website
Guest Editor
Departamento de Ciencias y Recursos Naturales, Universidad de Magallanes, Punta Arenas, Chile
Interests: seaweed reproduction; ecophysiology; photobiology; aquatic photosynthesis; biotechnology

Special Issue Information

Dear Colleagues,

Photosynthesis is a fundamental process used for conducting energy obtained in many organisms around the world, allowing light energy to enter metabolic reactions. As primary producers, algae sustain a relationship with many other algal-consuming organisms, and indirectly the entire trophic web. This Special Issue intends to contribute with novelties about photosynthesis regulation, considering environmental parameters, as well as the regulation of molecular and chemical reactions. In this sense, photosynthetic reactions can produce compounds that are precursors from other secondary algal metabolism reactions, associated with the synthesis of cellular structure, pigments, phenolic compounds, and defense substances, among others. In this way, studies on the monitoring of photosynthesis and the phytochemical synthesis of metabolites are encouraged in this Special Issue.

Dr. José Bonomi Barufi
Dr. Nelso Navarro
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Plants is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • chlorophyll fluorescence
  • pigments
  • secondary metabolites
  • photoregulation
  • oxygen production
  • carbon fixation
  • photochemical reactions

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Published Papers (3 papers)

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Research

22 pages, 2509 KiB  
Article
Effects of pH, Temperature, and Light on the Inorganic Carbon Uptake Strategies in Early Life Stages of Macrocystis pyrifera (Ochrophyta, Laminariales)
by Bárbara S. Labbé, Pamela A. Fernández, July Z. Florez and Alejandro H. Buschmann
Plants 2024, 13(23), 3267; https://doi.org/10.3390/plants13233267 - 21 Nov 2024
Viewed by 431
Abstract
The responses of seaweed species to increased CO2 and lowered pH (Ocean Acidification: OA) depend on their carbon concentrating mechanisms (CCMs) and inorganic carbon (Ci) preferences. However, few studies have described these mechanisms in the early life stages of seaweeds or assessed [...] Read more.
The responses of seaweed species to increased CO2 and lowered pH (Ocean Acidification: OA) depend on their carbon concentrating mechanisms (CCMs) and inorganic carbon (Ci) preferences. However, few studies have described these mechanisms in the early life stages of seaweeds or assessed the effects of OA and its interactions with other environmental drivers on their functionality and photophysiology. Our study evaluated the effects of pH, light (PAR), temperature, and their interactions on the Ci uptake strategies and photophysiology in the early stages of Macrocystis pyrifera. Gametophytes were cultivated under varying pH (7.80 and 8.20), light (20 and 50 µmol photons m−2s−1), and temperature (12 and 16 °C) conditions for 25 days. We assessed photophysiological responses and CCMs (in particular, the extracellular dehydration of HCO3− to CO2 mediated by the enzyme carbonic anhydrase (CA) and direct HCO3− uptake via an anion exchange port). This study is the first to describe the Ci uptake strategies in gametophytes of M. pyrifera, demonstrating that their primary CCM is the extracellular conversion of HCO3− to CO2 mediated by CA. Additionally, our results indicate that decreased pH can positively affect their photosynthetic efficiency and maximum quantum yield; however, this response is dependent on the light and temperature conditions. Full article
(This article belongs to the Special Issue Advances in Algal Photosynthesis and Phytochemistry)
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19 pages, 1999 KiB  
Article
Biomass Productivity and Photosynthetic Activity in Ulva compressa (Chlorophyta) in Raceway Photobioreactors Under Stress Conditions
by Victor Robles-Carnero, Rafael Sesmero and Felix L. Figueroa
Plants 2024, 13(21), 3038; https://doi.org/10.3390/plants13213038 - 30 Oct 2024
Viewed by 458
Abstract
Research in seaweed cultivation technologies aims to increase production and reduce costs, leading to more efficient and sustainable processes. In this study, we analyzed the outdoor production of Ulva compressa cultured in summertime at different stocking densities of 0.6, 0.8 and 1.0 kg [...] Read more.
Research in seaweed cultivation technologies aims to increase production and reduce costs, leading to more efficient and sustainable processes. In this study, we analyzed the outdoor production of Ulva compressa cultured in summertime at different stocking densities of 0.6, 0.8 and 1.0 kg Fresh weight (FW) m−2 in a raceway photobioreactor with 30 m2 surface (3000 L), and its relation to photosynthetic activity. Under the experimental conditions of high temperature (>28–30 °C) and pH > 9 in culture water, higher seaweed density resulted in lower specific growth rate. The biomass production has been related to photosynthetic activity by using in vivo chlorophyll a fluorescence. Dynamic photoinhibition was observed at noon, which was less severe in cultures with higher algal densities. However, photosynthesis recovered in the afternoon. Seaweeds that were acclimatized for a week to the conditions of 1.0 kg FW m−2 stocking density showed an increase in biomass growth and absence of photoinhibition compared to non-acclimatized thalli. In conclusion, the cultivation of U. compressa in a mid-scale raceway photobiorreactor under conditions of high irradiance and temperature and low nutrient input, exhibited the best photosynthetic performance and hence the highest growth rates for the highest culture density assayed (1.0 kg FW m−2). Full article
(This article belongs to the Special Issue Advances in Algal Photosynthesis and Phytochemistry)
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15 pages, 5095 KiB  
Article
Temperature Dependence and the Effects of Ultraviolet Radiation on the Ultrastructure and Photosynthetic Activity of Carpospores in Sub-Antarctic Red Alga Iridaea cordata (Turner) Bory 1826
by Nelso P. Navarro, Pirjo Huovinen, Jocelyn Jofre and Iván Gómez
Plants 2024, 13(18), 2547; https://doi.org/10.3390/plants13182547 - 11 Sep 2024
Viewed by 535
Abstract
The short-term effects of UV radiation and low temperature on ultrastructure, photosynthetic activity (measured as the maximal photochemical quantum yield of photosystem II: Fv/Fm), chlorophyll-a (Chl-a) contents, and UV-absorbing compounds on the carpospores of Iridaea cordata from [...] Read more.
The short-term effects of UV radiation and low temperature on ultrastructure, photosynthetic activity (measured as the maximal photochemical quantum yield of photosystem II: Fv/Fm), chlorophyll-a (Chl-a) contents, and UV-absorbing compounds on the carpospores of Iridaea cordata from a sub-Antarctic population were investigated. Exposure to both photosynthetically active radiation (PAR) and PAR + UV for 4 h caused ultrastructural modifications in all treatments. Under PAR + UV at 2 °C, a disruption of the chloroplast’s internal organization was observed. Plastoglobuli were often found in carpospores exposed to 2 °C. ‘Electron dense particles’, resembling physodes of brown algae, were detected for the first time in cells exposed to PAR and PAR + UV at 8 °C. Fv/Fm decreased following 4 h exposure at 2 °C under PAR + UV (64%) and PAR (25%). At 8 °C, Fv/Fm declined by 21% only under PAR + UV. The photosynthesis of carpospores previously treated with UV partially recovered after a 4 h exposure under dim light. UV-absorbing compounds were degraded in all radiation and temperature treatments without recovery after a 4 h dim light period. Chl-a did not change, whereas total carotenoids increased under PAR at 8 °C The study indicates that although carpospores of I. cordata exhibit photoprotective mechanisms, UV radiation strongly damages their ultrastructure and physiology, which were exacerbated under low temperatures. Full article
(This article belongs to the Special Issue Advances in Algal Photosynthesis and Phytochemistry)
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