Photosynthetic adaptation and multicellularity in the Antarctic psychrophile, Chlamydomonas priscuii

Hüner, Norman P.A.; Szyszka-Mroz, Beth; Ivanov, Alexander G.; Kata, Victoria; Lye, Hannah; Smith, David R.

doi:10.1016/j.algal.2023.103220

Cited by 3 publications

(2 citation statements)

References 190 publications

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“…priscuii was isolated from the deep photic zone of ELB where it experiences low light (<50 mmol*m -2 *s -1 ) enriched in blue spectrum (400 -500 nm), high salinity (80 -90 mS cm -1 ; 700 mM NaCl), low temperature (0 -5 °C) and supersaturated O 2 (30 -40 mg L -1 ; 200% air saturation levels) (Neale and Priscu, 1995). C. priscuii has been the subject of nearly 30 years of physiological study (reviewed in (Morgan-Kiss et al, 2006;Cvetkovska et al, 2022;Hüner et al, 2023). The genome of C. priscuii has been sequenced and is available in two searchable databases (NCBI and Phytozome) making it a robust model for studying the genetic and physiological underpinnings of stress adaptation (Zhang et al, 2021).…”

Section: Chlorophytesmentioning

confidence: 99%

“…Adaptation to the permanently high salinity environment may have contributed to the loss in capacity for state transitions: C. priscuii assembles a pigment-protein super complex which supports sustained rates of an alternative electron transport pathway around photosystem I (Kalra et al, 2020(Kalra et al, , 2023. Last, Hüner and colleagues reported that C. priscuii forms immobile, multicellular palmelloid structures which are functionally distinct from single cells and exhibit higher photoprotection from short-term high light stress (Szyszka-Mroz et al, 2022;Hüner et al, 2023). A recent study on two field isolates of C. reinhardtii also reported that palmelloids were essential for survival under excessive high light conditions (Suwannachuen et al, 2023).…”

Section: Chlorophytesmentioning

confidence: 99%

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Sentinel protist taxa of the McMurdo Dry Valley lakes, Antarctica: a review

Morgan-Kiss,

Popson,

Pereira

et al. 2024

Front. Ecol. Evol.

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High-latitude meromictic lakes such as those in the Antarctic McMurdo Dry Valleys (MDV) harbor aquatic ecosystems dominated by the microbial loop. Within this habitat, which is limited year-round by light and nutrients, protists, or single celled eukaryotes, play outsized roles in the food web as the dominant primary producers and the apex predators. Thus, the MDV lake ecosystem represents an ideal system to study the role of sentinel protist taxa in carbon and nutrient cycling. The perennially ice-covered lakes are part of the McMurdo Long Term Ecological Research (McM LTER; mcmlter.org) established in 1993. In this review we will highlight the diversity and trophic roles of the MDV lake protist community and compare environmental factors driving spatiotemporal patterns in key protist taxa in two lakes within the McM LTER, Lakes Bonney and Fryxell. We will then discuss lessons learned from manipulated experiments on the impact of current and future climate-driven environmental change on sensitive protist taxa. Last, we will integrate knowledge gained from 25 years of lab-controlled experiments on key photosynthetic protists to extend our understanding of the function of these extremophiles within the MDV aquatic food webs. Our research group has studied the distribution and function of the MDV microbial community for nearly two decades, training the next generation of scientists to tackle future problems of these globally significant microbes. This review article will also highlight early career scientists who have contributed to this body of work and represent the future of scientific understanding in the Anthropocene.

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Section: Chlorophytesmentioning

confidence: 99%

Section: Chlorophytesmentioning

confidence: 99%

Sentinel protist taxa of the McMurdo Dry Valley lakes, Antarctica: a review

Morgan-Kiss,

Popson,

Pereira

et al. 2024

Front. Ecol. Evol.

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Photostasis and photosynthetic adaptation to polar life

Hüner,

Ivanov,

Szyszka-Mroz

et al. 2024

Photosynth Res

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Permanent Stress Adaptation and Unexpected High Light Tolerance in the Shade-Adapted Chlamydomonas priscui

Popson,

D’Silva,

Wheeless

et al. 2024

Plants

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The Antarctic photopsychrophile, Chlamydomonas priscui UWO241, is adapted to extreme environmental conditions, including permanent low temperatures, high salt, and shade. During long-term exposure to this extreme habitat, UWO241 appears to have lost several short-term mechanisms in favor of constitutive protection against environmental stress. This study investigated the physiological and growth responses of UWO241 to high-light conditions, evaluating the impacts of long-term acclimation to high light, low temperature, and high salinity on its ability to manage short-term photoinhibition. We found that UWO241 significantly increased its growth rate and photosynthetic activity at growth irradiances far exceeding native light conditions. Furthermore, UWO241 exhibited robust protection against short-term photoinhibition, particularly in photosystem I. Lastly, pre-acclimation to high light or low temperatures, but not high salinity, enhanced photoinhibition tolerance. These findings extend our understanding of stress tolerance in extremophilic algae. In the past 2 decades, climate change-related increasing glacial stream flow has perturbed long-term stable conditions, which has been associated with lake level rise, the thinning of ice covers, and the expansion of ice-free perimeters, leading to perturbations in light and salinity conditions. Our findings have implications for phytoplankton survival and the response to change scenarios in the light-limited environment of Antarctic ice-covered lakes.

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Photosynthetic adaptation and multicellularity in the Antarctic psychrophile, Chlamydomonas priscuii

Cited by 3 publications

References 190 publications

Sentinel protist taxa of the McMurdo Dry Valley lakes, Antarctica: a review

Sentinel protist taxa of the McMurdo Dry Valley lakes, Antarctica: a review

Photostasis and photosynthetic adaptation to polar life

Permanent Stress Adaptation and Unexpected High Light Tolerance in the Shade-Adapted Chlamydomonas priscui

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