Photosynthetic efficiency and nutrient physiology of the diatom Thalassiosira pseudonana at three growth temperatures

Gleich, Samantha J.; Plough, Louis V.; Glibert, Patricia M.

doi:10.1007/s00227-020-03741-7

Cited by 12 publications

(10 citation statements)

References 55 publications

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“…For diatoms, but also for green algae, temperature dependence of respiration and photosynthesis differs, as photosynthesis is more dependent on light, while respiration is mainly controlled by temperature dependent enzymatic activity (Atkin and Tjoelker, 2003;Karsten et al, 2016). This is partly confirmed in a more recent paper by Gleich et al (2020), in which the authors indicate that light-dependent photosynthetic reactions are rather unaffected by temperature, while the carbon fixation reactions are not. In addition, a strong coupling of respiratory and photosynthetic activities is found in diatoms, which is explained by very tight physical interactions between chloroplasts and mitochondria (Bailleul et al, 2015).…”

Section: Temperature-dependent Photosynthesis and Respirationmentioning

confidence: 81%

“…However, no distinct differences in growth rates were found for the Baltic Sea and peatland diatom strains. This wide response can be explained as growth of diatoms is mainly impacted by physiological processes that are involved in photosynthesis, more specific in the uncoupling of C and N assimilation (Gleich et al, 2020;and references therein).…”

Section: Growthmentioning

confidence: 99%

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Ecophysiological and Cell Biological Traits of Benthic Diatoms From Coastal Wetlands of the Southern Baltic Sea

et al. 2021

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The German Baltic Sea coastline is characterized by sea-land transitions zones, specifically coastal peatlands. Such transition zones exhibit highly fluctuating environmental parameters and dynamic gradients that affect physiological processes of inhabiting organisms such as microphytobenthic communities. In the present study four representative and abundant benthic diatom strains [Melosira nummuloides, Nitzschia filiformis, Planothidium sp. (st. 1) and Planothidium sp. (st.2)] were isolated from a Baltic Sea beach and three peatlands that are irregularly affected by Baltic Sea water intrusion. Ecophysiological and cell biological traits of the strains were investigated for the first time as function of light, temperature and salinity. The four strains exhibited euryhaline growth over a range of 1–39 SA, surpassing in situ salinity of the respective brackish habitats. Furthermore, they showed eurythermal growth over a temperature range from 5 to 30°C with an optimum temperature between 15 and 20°C. Growth rates did not exhibit any differences between the peatland and Baltic Sea strains. The photosynthetic temperature optimum of the peatland diatom isolates, however, was much higher (20–35°C) compared to the Baltic Sea one (10°C). All strains exhibited light saturation points ranging between 29.8 and 72.6 μmol photons m–2 s–1. The lipid content did not change in response to the tested abiotic factors. All data point to wide physiological tolerances in these benthic diatoms along the respective sea-land transitions zones. This study could serve as a baseline for future studies on microphytobenthic communities and their key functions, like primary production, under fluctuating environmental stressors along terrestrial-marine gradients.

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Section: Temperature-dependent Photosynthesis and Respirationmentioning

confidence: 81%

Section: Growthmentioning

confidence: 99%

Ecophysiological and Cell Biological Traits of Benthic Diatoms From Coastal Wetlands of the Southern Baltic Sea

et al. 2021

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“…For temperate diatoms, but also for terrestrial green algae, temperature requirements for respiration and photosynthesis differ, as explained by the higher dependency of photosynthesis on light, while temperaturedependent enzymatic activities mainly control respiration [76,77]. A more recent study partially confirmed that light-dependent photosynthetic reactions are indeed unaffected by temperature, while the carbon fixation reactions are driven by temperature [78]. Furthermore, respiratory and photosynthetic activities in diatoms are strongly coupled, which is mechanistically explained by tight physical interactions between mitochondria and chloroplasts [79].…”

Section: Temperaturementioning

confidence: 98%

Photosynthetic, Respirational, and Growth Responses of Six Benthic Diatoms from the Antarctic Peninsula as Functions of Salinity and Temperature Variations

Prelle

Schmidt

Schimani

et al. 2022

Genes

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Temperature and salinity are some of the most influential abiotic parameters shaping biota in aquatic ecosystems. In recent decades, climate change has had a crucial impact on both factors—especially around the Antarctic Peninsula—with increasing air and water temperature leading to glacial melting and the accompanying freshwater increase in coastal areas. Antarctic soft and hard bottoms are typically inhabited by microphytobenthic communities, which are often dominated by benthic diatoms. Their physiology and primary production are assumed to be negatively affected by increased temperatures and lower salinity. In this study, six representative benthic diatom strains were isolated from different aquatic habitats at King George Island, Antarctic Peninsula, and comprehensively identified based on molecular markers and morphological traits. Photosynthesis, respiration, and growth response patterns were investigated as functions of varying light availability, temperature, and salinity. Photosynthesis–irradiance curve measurements pointed to low light requirements, as light-saturated photosynthesis was reached at <70 µmol photons m−2 s−1. The marine isolates exhibited the highest effective quantum yield between 25 and 45 SA (absolute salinity), but also tolerance to lower and higher salinities at 1 SA and 55 SA, respectively, and in a few cases even <100 SA. In contrast, the limnic isolates showed the highest effective quantum yield at salinities ranging from 1 SA to 20 SA. Almost all isolates exhibited high effective quantum yields between 1.5 °C and 25 °C, pointing to a broad temperature tolerance, which was supported by measurements of the short-term temperature-dependent photosynthesis. All studied Antarctic benthic diatoms showed activity patterns over a broader environmental range than they usually experience in situ. Therefore, it is likely that their high ecophysiological plasticity represents an important trait to cope with climate change in the Antarctic Peninsula.

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“…We identified a polyamine synthase homologue in P. tricornutum displaying significant modulation of its expression in response to nitrate and phosphate availability levels, as well as homologue bearing the same mutation in a Chaetoceros transcriptome. Polyamine biosynthetic processes have been linked to diatom physiological responses to nitrogen, salinity and temperature (Scoccianti et al 1995; Liu et al 2016; Gleich et al 2020) and many polar diatoms show increased silicate content under iron-limited conditions, which can result from either increased silicate accumulation or lower accumulation of nitrate depending on the species considered (Timmermans et al 2004; Hoffmann et al 2007). Despite this, the putative link between abiotic parameter variations across stations and the variant frequency patterns observed remains unclear.…”

Section: Discussionmentioning

confidence: 99%

Whole-genome scanning reveals selection mechanisms in epipelagic Chaetoceros diatom populations

Nef

Madoui

Pelletier

et al. 2022

Preprint

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Diatoms form a diverse and abundant group of photosynthetic protists that are essential players in marine ecosystems. However, the microevolutionary structure of their populations remains poorly understood, particularly in polar regions. Exploring how closely related diatoms adapt to different oceanic ecoregions is essential given their short generation times, which may allow rapid adaptations to different environments; and their prevalence in marine regions dramatically impacted by climate change, such as the Arctic and Southern Oceans. Here, we address genetic diversity patterns in Chaetoceros, the most abundant diatom genus and one of the most diverse, using 11 metagenome-assembled genomes (MAGs) reconstructed from Tara Oceans metagenomes. Genome-resolved metagenomics on these MAGs confirmed a prevalent distribution of Chaetoceros in the Arctic Ocean with lower dispersal in the Pacific and Southern Oceans as well as in the Mediterranean Sea. Single nucleotide variants identified within the different MAG populations allowed us to draw a first landscape of Chaetoceros genetic diversity and to reveal an elevated genetic structure in some Arctic Ocean populations with FST levels ranging up to ≥ 0.2. Genetic differentiation patterns of closely related Chaetoceros populations appear to be correlated with abiotic factors rather than with geographic distance. We found clear positive selection of genes involved in nutrient availability responses, in particular for iron (e.g., ISIP2a, flavodoxin), silicate and phosphate (e.g., polyamine synthase), that were further confirmed in Chaetoceros transcriptomes. Altogether, these results provide new insights and perspectives into diatom metapopulation genomics through the integration of metagenomic and environmental data.

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Photosynthetic efficiency and nutrient physiology of the diatom Thalassiosira pseudonana at three growth temperatures

Cited by 12 publications

References 55 publications

Ecophysiological and Cell Biological Traits of Benthic Diatoms From Coastal Wetlands of the Southern Baltic Sea

Ecophysiological and Cell Biological Traits of Benthic Diatoms From Coastal Wetlands of the Southern Baltic Sea

Photosynthetic, Respirational, and Growth Responses of Six Benthic Diatoms from the Antarctic Peninsula as Functions of Salinity and Temperature Variations

Whole-genome scanning reveals selection mechanisms in epipelagic Chaetoceros diatom populations

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