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Study of Ecophysiological Responses of the Antarctic Fruticose Lichen Cladonia borealis Using the PAM Fluorescence System under Natural and Laboratory Conditions

Cited 6 time in wos
Cited 5 time in scopus
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Title
Study of Ecophysiological Responses of the Antarctic Fruticose Lichen Cladonia borealis Using the PAM Fluorescence System under Natural and Laboratory Conditions
Other Titles
PAM 형광시스템을 이용한 남극지의류 Cladonia borealis의 자연 및 실험실조건의 생태생리학적 반응 연구
Authors
Cho, Sung Mi
Lee, Hyoungseok
Hong, Soon Gyu
Lee, Jungeun
Subject
Plant Sciences
Keywords
fruticose lichens; Cladonia borealis; Antarctic; phytochemistry; poikilohydric; nonphotochemical quenching; desiccated state; shade-adapted lichen
Issue Date
2020-01
Citation
Cho, Sung Mi, et al. 2020. "Study of Ecophysiological Responses of the Antarctic Fruticose Lichen Cladonia borealis Using the PAM Fluorescence System under Natural and Laboratory Conditions". PLANTS-BASEL, 9(1): 85-104.
Abstract
Antarctic lichens have been used as indicators of climate change for decades, but only a few species have been studied. We assessed the photosynthetic performance of the fruticose lichen Cladonia borealis under natural and laboratory conditions using the PAM fluorescence system. Compared to that of sun-adapted Usnea sp., the photosynthetic performance of C. borealis exhibits a feature of shade-adapted lichen, and its chlorophyll fluorescence does not occur during dry days without rain. To understand its desiccation-rehydration responses, we measured changes in PSII photochemistry in C. borealis under the average light intensity of dawn light and daylight and the desiccating conditions of its natural microclimate. Interestingly, samples under daylight and rapid-desiccation conditions showed a delayed reduction in Fv’/Fm’ and rETRmax, and an increase in Y(II) and Y(NPQ) levels. Such results suggest that the photoprotective mechanism of C. borealis depends on sunlight and becomes more efficient with improved desiccation tolerance. Amplicon sequencing revealed that the major photobiont of C. borealis was Asterochloris irregularis, which has not been reported in Antarctica before. Collectively, these results from both field and laboratory could provide a better understanding of specific ecophysiological responses of shade-adapted lichens in the Antarctic region.
URI
https://repository.kopri.re.kr/handle/201206/11989
DOI
http://dx.doi.org/10.3390/plants9010085
Appears in Collections  
2020-2020, Ecophysiology of KGI terrestrial organisms to reveal mechanisms of adaptation to changing environment (20-20) / Lee, Hyoungseok (PE20170)
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