Ecophysiological constraints of Aster tripolium under extreme thermal events impacts: Merging biophysical, biochemical and genetic insights

Duarte, Bernardo; Goessling, Johannes W.; Marques, João Carlos

doi:10.1016/j.plaphy.2015.10.015

Cited by 56 publications

(45 citation statements)

References 52 publications

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“…Light energy yields of the PSII reaction centres were determined with a saturating light pulse, as described in Duarte et al . (). Rapid light curve (RLC) measurements, in dark‐adapted leaves, were made using the pre‐programmed LC1 protocol of the FluorPen (Duarte et al .…”

Section: Methodsmentioning

confidence: 97%

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Disentangling the photochemical salinity tolerance in Aster tripolium L.: connecting biophysical traits with changes in fatty acid composition

et al. 2016

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A profound analysis of A. tripolium photochemical traits under salinity exposure is lacking in the literature, with very few references focusing on its fatty acid profile role in photophysiology. To address this, the deep photochemical processes were evaluated by Pulse Amplitude Modulated (PAM) Fluorometry coupled with a discrimination of its leaf fatty acid profile. Plants exposed to 125-250 mm NaCl showed higher photochemical light harvesting efficiencies and lower energy dissipation rates. under higher NaCl exposure, there is evident damage of the oxygen evolving complexes (OECs). On the other hand, Reaction Centre (RC) closure net rate and density increased, improving the energy fluxes entering the PS II, in spite of the high amounts of energy dissipated and the loss of PS II antennae connectivity. Energy dissipation was mainly achieved through the auroxanthin pathway. Total fatty acid content displayed a similar trend, being also higher under 125-250 mm NaCl with high levels of omega-3 and omega-6 fatty acids. The increase in oleic acid and palmitic acid allows the maintenance of the good functioning of the PS II. Also relevant was the high concentration of chloroplastic C16:1t in the individuals subjected to 125-250 mm NaCl, related with a higher electron transport activity and with the organization of the Light Harvesting Complexes (LHC) and thus reducing the activation of energy dissipation mechanisms. All these new insights shed some light not only on the photophysiology of this potential cash-crop, but also highlight its important saline agriculture applications of this species as forage and potential source of essential fatty acids.

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Section: Methodsmentioning

confidence: 97%

“…Five replicates were always considered, as several previous studies have shown that this replication provides reliable data (Duarte et al . , , ,b).…”

Section: Methodsmentioning

confidence: 99%

Disentangling the photochemical salinity tolerance in Aster tripolium L.: connecting biophysical traits with changes in fatty acid composition

et al. 2016

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“…Moreover, thermal stresses have a very typical signature at the PS II level (Srivastava et al, 1997;Strasser et al, 2000). Thermal stress impairs typically the donor side of the PS II reaction centers, which corresponds to the location of oxygen evolving complexes (OEC) (Strasser et al, 2000;Duarte et al, 2015aDuarte et al, ,b, 2016. This imposes serious physiological constrains to the chloroplastidial electron transport and energy production.…”

Section: B Forms and Effects Of Phenotypic Variation B1 Physiologicalmentioning

confidence: 99%

“…This imposes serious physiological constrains to the chloroplastidial electron transport and energy production. Therefore, only species with a high degree of physiological plasticity can cope with abrupt changes, such as heat waves (Duarte et al, 2015a(Duarte et al, ,b, 2016. From an ecological point of view, rising temperatures affect the role of kelp forests and seagrass beds as primary oxygen producers and, thus, all the heterotrophic food chain.…”

Section: B Forms and Effects Of Phenotypic Variation B1 Physiologicalmentioning

confidence: 99%

“…The accumulation of reducing power inside the chloroplast (Duarte et al, 2015a) increases non-photochemical quenching and decreases the photochemical quenching in order to dissipate excessive energy (Repolho et al, 2017). This can be performed by quantum dissipation or by enzymatic means, through the de-epoxidation of the xanthophylls (Figure 2, DES).…”

Section: B Forms and Effects Of Phenotypic Variation B1 Physiologicalmentioning

confidence: 99%

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Climate Change Impacts on Seagrass Meadows and Macroalgal Forests: An Integrative Perspective on Acclimation and Adaptation Potential

et al. 2018

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Marine macrophytes are the foundation of algal forests and seagrass meadows-some of the most productive and diverse coastal marine ecosystems on the planet. These ecosystems provide nursery grounds and food for fish and invertebrates, coastline protection from erosion, carbon sequestration, and nutrient fixation. For marine macrophytes, temperature is generally the most important range limiting factor, and ocean warming is considered the most severe threat among global climate change factors. Ocean warming induced losses of dominant macrophytes along their equatorial range edges, as well as range extensions into polar regions, are predicted and already documented. While adaptive evolution based on genetic change is considered too slow to keep pace with the increasing rate of anthropogenic environmental changes, rapid adaptation may come about through a set of non-genetic mechanisms involving the functional composition of the associated microbiome, as well as epigenetic modification of the genome and its regulatory effect on gene expression and the activity of transposable elements. While research in terrestrial plants demonstrates that the integration of non-genetic mechanisms provide a more holistic picture of a species' evolutionary potential, research in marine systems is lagging behind. Here, we aim to review the potential of marine macrophytes to acclimatize and adapt to major climate change effects via intraspecific variation at the genetic, epigenetic, and microbiome levels. All three levels create phenotypic variation that may either enhance fitness within individuals (plasticity) or be subject to selection and ultimately, adaptation. We

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Climate Change Impacts on Salt Marsh Vegetation Ecophysiology

Caçador

Marques

2019

Tasks for Vegetation Science

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Ecophysiological constraints of Aster tripolium under extreme thermal events impacts: Merging biophysical, biochemical and genetic insights

Cited by 56 publications

References 52 publications

Disentangling the photochemical salinity tolerance in Aster tripolium L.: connecting biophysical traits with changes in fatty acid composition

Disentangling the photochemical salinity tolerance in Aster tripolium L.: connecting biophysical traits with changes in fatty acid composition

Climate Change Impacts on Seagrass Meadows and Macroalgal Forests: An Integrative Perspective on Acclimation and Adaptation Potential

Climate Change Impacts on Salt Marsh Vegetation Ecophysiology

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