Diversity in Xanthophyll Cycle Pigments Content and Related Nonphotochemical Quenching (NPQ) Among Microalgae: Implications for Growth Strategy and Ecology

Lacour, Thomas; Babin, Marcel; Lavaud, Johann

doi:10.1111/jpy.12944

Cited by 57 publications

(74 citation statements)

References 150 publications

(264 reference statements)

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“…Diatoms also benefit from rapid pigment conversion by Dt epoxidase during subsequent transition to low light that is evident through rapid relaxation/reversibility (within 5 min) of a component of nonphotochemical quenching [85,110]. Such patterns were consistent with those we observed, with all species increasing Dt concentrations under HL [39], however this was not always consistent with a rapidly reversible nonphotochemical quenching. While T. pseudonana showed rapidly reversible nonphotochemical quenching, T. weissflogii appeared to sustain nonphotochemical quenching upon transition to low light, in parallel with its low capacity for PSII repair (k REC ; Table 3).…”

Section: Plos Onesupporting

confidence: 87%

“…Dynamic light regimes appear to select for phytoplankton taxa with different strategies of nonphotochemical quenching to optimize cell growth and survival, as demonstrated in a recent comparative assessment of various microalgal species and ecotypes [39]. Environments characterized by particularly large light fluctuations include shallow waters that are inhabited by both benthic diatoms and pelagic estuarine/coastal diatoms.…”

Section: Introductionmentioning

confidence: 99%

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Divergence of photosynthetic strategies amongst marine diatoms

et al. 2020

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Marine phytoplankton, and in particular diatoms, are responsible for almost half of all primary production on Earth. Diatom species thrive from polar to tropical waters and across light environments that are highly complex to relatively benign, and so have evolved highly divergent strategies for regulating light capture and utilization. It is increasingly well established that diatoms have achieved such successful ecosystem dominance by regulating excitation energy available for generating photosynthetic energy via highly flexible light harvesting strategies. However, how different light harvesting strategies and downstream pathways for oxygen production and consumption interact to balance excitation pressure remains unknown. We therefore examined the responses of three diatom taxa adapted to inherently different light climates (estuarine Thalassioisira weissflogii, coastal Thalassiosira pseudonana and oceanic Thalassiosira oceanica) during transient shifts from a moderate to high growth irradiance (85 to 1200 μmol photons m-2 s-1). Transient high light exposure caused T. weissflogii to rapidly downregulate PSII with substantial nonphotochemical quenching, protecting PSII from inactivation or damage, and obviating the need for induction of O2 consuming (light-dependent respiration, LDR) pathways. In contrast, T. oceanica retained high excitation pressure on PSII, but with little change in RCII photochemical turnover, thereby requiring moderate repair activity and greater reliance on LDR. T. pseudonana exhibited an intermediate response compared to the other two diatom species, exhibiting some downregulation and inactivation of PSII, but high repair of PSII and induction of reversible PSII nonphotochemical quenching, with some LDR. Together, these data demonstrate a range of strategies for balancing light harvesting and utilization across diatom species, which reflect their adaptation to sustain photosynthesis under environments with inherently different light regimes.

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Section: Plos Onesupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Divergence of photosynthetic strategies amongst marine diatoms

et al. 2020

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“…NPQ and the underlying xanthophyll cycle are keystone components of species-specific photoadaptative strategies in most microalgae groups (Lacour et al 2020), allowing them to cope with changing light conditions and deeply influencing the global carbon cycle ( Alvarez et al 2019). Our study describes similar photoadaptation patterns across Arctic diatoms from different light niches, but surprisingly, also reveals contrasts in the dark regulation of these photoprotective mechanisms across niches (Supporting Information Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Compared to their temperate counterparts, important distinctions among polar diatom photoadaptation strategies are emerging (Lacour et al 2017, 2020). In addition to dynamic NPQ‐ qE , sustained NPQ (NPQ S ) together with high diatoxanthin amounts are commonly reported both in polar diatom cultures (Lacour et al 2018) and in sea‐ice communities (Galindo et al 2017).…”

Section: Figmentioning

confidence: 99%

“…Moreover, defining microalgal functional groups by their NPQ and xanthophyll cycle patterns has proven a powerful tool to enhance modeling of seasonal species succession (Polimene et al 2014) and global carbon fixation ( Alvarez et al 2019). Compared to their temperate counterparts, important distinctions among polar diatom photoadaptation strategies are emerging (Lacour et al 2017(Lacour et al , 2020. In addition to dynamic NPQ-qE, sustained NPQ (NPQ S ) together with high diatoxanthin amounts are commonly reported both in polar diatom cultures (Lacour et al 2018) and in sea-ice communities (Galindo et al 2017).…”

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confidence: 99%

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Contrasting nonphotochemical quenching patterns under high light and darkness aligns with light niche occupancy in Arctic diatoms

Croteau

Guérin

Bruyant

et al. 2020

Limnology & Oceanography

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Over the seasons, Arctic diatom species occupy shifting habitats defined by contrasting light climates, constrained by snow and ice cover dynamics interacting with extreme photoperiod and solar angle variations. How Arctic diatom photoadaptation strategies differ across their heterogeneous light niches remains a poorly documented but crucial missing link to anticipate Arctic Ocean responses to shrinking sea-ice and increasing light. To address this question, we selected five Arctic diatom species with diverse life traits, representative of distinct light niches across the seasonal light environment continuum: from snow-covered dimly lit bottom ice to summer stratified waters. We studied their photoacclimation plasticity to two growth light levels and the subsequent responses of their nonphotochemical quenching (NPQ) and xanthophyll cycle to both dark incubations and light shifts. We deciphered NPQ and xanthophyll cycle tuning in darkness and their light-dependent induction kinetics, which aligned with species' light niche occupancy. In ice-related species, NPQ was sustained in darkness and its induction was more reactive to moderate light shifts. Open-water species triggered strong NPQ induction in darkness and reached higher maximal NPQ under high light. Marginal ice zone species showed strong adaptation to light fluctuations with a dark response fine-tuned depending upon light history. We argue these traits are anchored in diverging photoadaption strategies fostering Arctic diatom success in their respective light niches.

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