It's what's inside that matters: physiological adaptations of high‐latitude marine microalgae to environmental change

Young, Jodi N.; Schmidt, Katrin

doi:10.1111/nph.16648

Cited by 22 publications

(9 citation statements)

References 105 publications

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“…Many of the diatom plastid transporters showed similar correlations to different environmental factors (Figure 5A), e.g., positive transcriptional correlations with primary production-related parameters (pigments, net primary production, particulate inorganic, organic and total carbon), and negative correlations with iron, pH, and temperature (Figure 5A). These trends likely reflect diatom environmental preferences for high-latitude, nutrient-rich but iron-limited, and highly productive environments (Malviya et al, 2016;Benoiston et al, 2017;Nonoyama et al, 2019;Young and Schmidt, 2020).…”

Section: Environmental Correlations With Abundance Of Diatom Plastid ...mentioning

confidence: 96%

A metabolic, phylogenomic and environmental atlas of diatom plastid transporters from the model species Phaeodactylum

et al. 2022

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Diatoms are an important group of algae, contributing nearly 40% of total marine photosynthetic activity. However, the specific molecular agents and transporters underpinning the metabolic efficiency of the diatom plastid remain to be revealed. We performed in silico analyses of 70 predicted plastid transporters identified by genome-wide searches of Phaeodactylum tricornutum. We considered similarity with Arabidopsis thaliana plastid transporters, transcriptional co-regulation with genes encoding core plastid metabolic pathways and with genes encoded in the mitochondrial genomes, inferred evolutionary histories using single-gene phylogeny, and environmental expression trends using Tara Oceans meta-transcriptomics and meta-genomes data. Our data reveal diatoms conserve some of the ion, nucleotide and sugar plastid transporters associated with plants, such as non-specific triose phosphate transporters implicated in the transport of phosphorylated sugars, NTP/NDP and cation exchange transporters. However, our data also highlight the presence of diatom-specific transporter functions, such as carbon and amino acid transporters implicated in intricate plastid-mitochondria crosstalk events. These confirm previous observations that substrate non-specific triose phosphate transporters (TPT) may exist as principal transporters of phosphorylated sugars into and out of the diatom plastid, alongside suggesting probable agents of NTP exchange. Carbon and amino acid transport may be related to intricate metabolic plastid-mitochondria crosstalk. We additionally provide evidence from environmental meta-transcriptomic/meta- genomic data that plastid transporters may underpin diatom sensitivity to ocean warming, and identify a diatom plastid transporter (J43171) whose expression may be positively correlated with temperature.

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Section: Environmental Correlations With Abundance Of Diatom Plastid ...mentioning

confidence: 96%

A metabolic, phylogenomic and environmental atlas of diatom plastid transporters from the model species Phaeodactylum

et al. 2022

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“…More importantly, all three strains responded to long-term salinity stress by increasing CEF; although, CEF rates in C. reinhardtii -HS were still significantly slower relative to the extremophiles. Sustained CEF has also been recently reported in other extremophilic algae living in high latitude environments, such as the snow alga Chlamydomonas nivalis (Young & Schmidt, 2020; Zheng, Xue et al, 2020). ECS measurements in C. reinhardtii and UWO241 higher CEF in high salt-acclimated cells, which was associated with increased proton flux through ATP synthase in both species (Figure S3; Kalra et al, 2020).…”

Section: Discussionmentioning

confidence: 70%

High salinity activates CEF and attenuates state transitions in both psychrophilic and mesophilic Chlamydomonas species

Kalra

Wang

Zhang

et al. 2022

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In the last decade, studies have revealed the importance of PSI-driven cyclic electron flow (CEF) in stress acclimation in model organisms like C. reinhardtii; however, these studies focused on transient, short-term stress. In addition, PSI-supercomplexes are associated with CEF during state transition response to short-term stress. On the other hand, the role of CEF during long-term stress acclimation is still largely unknown. In this study, we elucidate the involvement of CEF in acclimation response to long-term high salinity in three different Chlamydomonas species displaying varying salinity tolerance. We compared CEF rates, capacity for state transitions, and formation of supercomplexes after salinity acclimation in the model mesophile C. reinhardtii and two psychrophilic green algae C. priscuii (UWO241) and C. sp. ICE-MDV. CEF was activated under high salt in all three species, with the psychrophilic Chlamydomonas spp. exhibiting the highest CEF rates. High salt acclimation was also correlated with reduced state transition capacity and a PSI-supercomplex was associated with high CEF. We propose that under long-term stress, CEF is constitutively activated through assembly of a stable PSI-supercomplex. The proteomic composition of the long-term PSI-supercomplex is distinct from the supercomplex formed during state transitions, and its presence attenuates the state transition response.

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“…First, in the absence of salt stress, psychrophilic UWO241 and ICE-MDV exhibited faster CEF rates compared with C. reinhardtii. Sustained CEF has been recently reported in other extremophilic algae living in high latitude environments, such as the snow alga Chlamydomonas nivalis (Young & Schmidt, 2020;Zheng et al, 2020). Thus, adaptation to permanent low temperatures appears to confer constitutively high CEF.…”

Section: Discussionmentioning

confidence: 86%

High salt-induced PSI-supercomplex is associated with high CEF and attenuation of state-transitions

Kalra

Wang

Zhang

et al. 2023

Preprint

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While PSI-driven cyclic electron flow (CEF) and assembly of thylakoid supercomplexes have been described in model organisms like Chlamydomonas reinhardtii, open questions remain regarding their contributions to survival under long term stress. The Antarctic halophyte, C. priscuii UWO241 (UWO241), possesses constitutive high CEF rates and a stable PSI-supercomplex as a consequence of adaptation to permanent low temperatures and high salinity. To understand whether CEF represents a common strategy in long-term stress acclimation, we compared high salt acclimation in the halotolerant UWO241 with a salt-sensitive model, C. reinhardtii, as well as a moderately halotolerant Antarctic green alga, C. sp. ICE-MDV (ICE-MDV). CEF was activated under high salt and associated with increased non-photochemical quenching in C. reinhardtii and ICE-MDV. Furthermore, high salt acclimated cells of either strain formed a PSI-supercomplex, while state transition capacity was attenuated. How the CEF-associated PSI-supercomplex interferes with state transition response is not yet known. We present a model for interaction between PSI-supercomplex formation, state transitions and the essential role of CEF for survival during long-term exposure to high salt.

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It's what's inside that matters: physiological adaptations of high‐latitude marine microalgae to environmental change

Cited by 22 publications

References 105 publications

A metabolic, phylogenomic and environmental atlas of diatom plastid transporters from the model species Phaeodactylum

A metabolic, phylogenomic and environmental atlas of diatom plastid transporters from the model species Phaeodactylum

High salinity activates CEF and attenuates state transitions in both psychrophilic and mesophilic Chlamydomonas species

High salt-induced PSI-supercomplex is associated with high CEF and attenuation of state-transitions

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