Zostera noltii development probing using chlorophyll a transient analysis (JIP-test) under field conditions: Integrating physiological insights into a photochemical stress index

Duarte, Bernardo; Pedro, Sílvia; Marques, João Carlos; Adão, Helena

doi:10.1016/j.ecolind.2017.01.023

Cited by 43 publications

(46 citation statements)

References 62 publications

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“…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. PI Performance index on absorption basis, incorporating the steps of antenna, reaction centre and electron transport parameters was lower than control in water deficit treatment followed by heat stress, similar results have been reported by Duarte et al (2017).…”

Section: Discussionsupporting

confidence: 84%

Integrated high-resolution phenotyping, chlorophyll fluorescence induction kinetics and photosystem II dynamics under water stress and heat in Wheat (Triticum aestivum)

Shanker

Coe

Sirault

2019

Preprint

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An experiment was conducted in controlled conditions in three varieties of wheat under water stress, heat and heat +water stress treatments with the objective of studying Chlorophyll a fluorescence, chlorophyll fluorescence induction kinetics and the function of Photosystem II by plant phenotyping as affected by stress. We hypothesised that during stress, specific adaptive strategies are employed by plants, such as structural and functional changes in PS II by which they acquire new homeostasis which may be protective adaptations. Water stress stress treatment was imposed on Water stress and Heat +Water stress treatments at 43 DAS.Heat treatment was imposed on 48 DAS. Maximum quantum yield of primary photochemistry was measured with PAM 2500 and OJIP was measured with FluorPen FP 100 after the onset of stress at four observation times on two days viz., pre-dawn and afternoon during stress. In addition continuous monitoring of photosynthetic efficiency was done with Monitoring PAM.Heat +Water stress stress was more detrimental as compared to Heat or Water stress alone in terms of maximum quantum yield of photochemistry. This could have been due to higher decrease in connectivity between PSII and its antennae resulting in lower photosynthetic efficiency resulting in the impairment and disruption of the electron transport. K step was observed in heat stress and heat +Water stress stress which may be because of damage to Oxygen Evolving Complex indicating that low thermostability of the complex. The stress treatments had a reduction in the plastoquinone pool size as indicated by the reduced area above the OJIP curve. Our study indicated that the instrument PAM 2500 sensed both stresses separately and combined earlier than the other instruments, so in terms of sensitivity PAM 2500 was more effective than FluorPen FP 100 and MultispeQ. Rapid screening of stress was more effectively with FluorPen FP 100 and MultispeQ than by PAM 2500.

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Section: Discussionsupporting

confidence: 84%

Integrated high-resolution phenotyping, chlorophyll fluorescence induction kinetics and photosystem II dynamics under water stress and heat in Wheat (Triticum aestivum)

Shanker

Coe

Sirault

2019

Preprint

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“…PUFAs were shown to enhance growth rates and reproductive capacities of aquatic animals (Von elert, 2004), as well as to be of great importance to the neural/cognitive, cardiovascular, and visual health of terrestrial vertebrates (Calder, 2015). Any stress like warming, that affects the fatty acid composition of membrane lipids, has inevitable impacts on the photosynthetic and respiratory pathways that are already under stress due to perturbations at the energy transduction level (Matos et al, 2007;Gameiro et al, 2016;Duarte et al, 2017a).…”

Section: B Forms and Effects Of Phenotypic Variation B1 Physiologicalmentioning

confidence: 99%

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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“…These foundation habitat-forming species influence ecosystem structure and function by creating locally stable conditions for other species (Thomson et al, 2015). Seagrasses are key-players in the marine ecosystem by providing not only shelter and reproduction grounds for several important animal species, but also by being an important food source to the whole food chain, both directly and due to detritus exportation (Duarte et al, 2017b;Repolho et al, 2017). The polyunsaturated fatty acids (PUFAs) linoleic (C18:2, n-6) and α-linolenic (C18:3, n-3) are essential fatty acids which cannot be synthetized by animals (van Ginneken et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Currently, seagrass meadows are experiencing a rapid and global decline at faster rates than the loss of tropical rain forests (Waycott et al, 2009). While gradual habitat degradation causes gradual diebacks, extreme climate events result in sudden large-scale collapses (Duarte et al, 2018c(Duarte et al, , 2017bMoore et al, 2014;Nicastro et al, 2013). Nevertheless, in some cases it is also possible to observe a regrowth and recover of the seagrass beds, after these collapses (Duarte et al, 2018c(Duarte et al, , 2017b.…”

Section: Introductionmentioning

confidence: 99%

“…While gradual habitat degradation causes gradual diebacks, extreme climate events result in sudden large-scale collapses (Duarte et al, 2018c(Duarte et al, , 2017bMoore et al, 2014;Nicastro et al, 2013). Nevertheless, in some cases it is also possible to observe a regrowth and recover of the seagrass beds, after these collapses (Duarte et al, 2018c(Duarte et al, , 2017b. During seagrass bed formation there is an evident and important metabolic development in terms of primary production allowing a substantial increase in the seagrass bed biomass (Duarte et al, 2017b).…”

Section: Introductionmentioning

confidence: 99%

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Dwarf eelgrass (Zostera noltii) leaf fatty acid profile during a natural restoration process: Physiological and ecological implications

Duarte

Matos

Pedro

et al. 2019

Ecological Indicators

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A B S T R A C TSeagrass beds are among the most relevant ecosystem engineers, providing essential ecosystem services for the surrounding coastal communities. Alongside, these ecosystems are among the most threaten in the world, and thus several restoration projects have been developed in the past years. Seagrasses are important sources of essential fatty acids (FA) for animals, which are unable to synthetize them. During the seagrass growth and photochemical maturation, there is a membrane remodelling, where some fatty acids are synthetized. When analysing the FA changes at different development stages, one of the first noticeable changes is the increase in C16:1t (trans-hexadecenoic acid), associated to an increase in the chloroplast membrane fluidity, essential for the efficient energy transduction processes to occur in the thylakoids. Also, interesting to observe are the high levels of omega-3 and -6 (30-43% and 18-31% of total fatty acid content, respectively) present in this seagrass, reinforcing the nutritional value of this species as source of essential fatty acids for the primary consumers. Additionally, it is possible to observe that in the more mature plants there is a high leaf concentration of C18:3. Recent reports suggest that C18:3 can act as a direct scavenger of reactive oxygen species (ROS), indicating a lower stress level, as suggested by the higher photochemical efficiency previously observed. Moreover, it is also interesting to observe that total long-chain polyunsaturated fatty acids (LC-PUFAs) content show a significant increase with the biomass development. These LC-PUFAs are not produced by higher plants and their production in animals occurs at low rates, suggesting they may have as origin the microalgae in the grass surface, adding another important ecosystem service to these prairies, as support for microalgae development and carriers of LC-PUFAs into the food web.This membrane remodelling appears to be on the basis of the photochemical maturation of these seagrasses observed in previous studies and can be used as potential and efficient tool to monitor the development stage of the prairies and its physiological status in future restoration processes. Moreover, it becomes evident that highly developed seagrass beds are crucial food source providers in terms of essential fatty acids to the estuarine heterotrophic life.

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Zostera noltii development probing using chlorophyll a transient analysis (JIP-test) under field conditions: Integrating physiological insights into a photochemical stress index

Cited by 43 publications

References 62 publications

Integrated high-resolution phenotyping, chlorophyll fluorescence induction kinetics and photosystem II dynamics under water stress and heat in Wheat (Triticum aestivum)

Integrated high-resolution phenotyping, chlorophyll fluorescence induction kinetics and photosystem II dynamics under water stress and heat in Wheat (Triticum aestivum)

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

Dwarf eelgrass (Zostera noltii) leaf fatty acid profile during a natural restoration process: Physiological and ecological implications

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