Počet záznamů: 1
Ecophysiological and ultrastructural characterisation of the circumpolar orange snow alga Sanguina aurantia compared to the cosmopolitan red snow alga Sanguina nivaloides (Chlorophyta)
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SYSNO ASEP 0544995 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Ecophysiological and ultrastructural characterisation of the circumpolar orange snow alga Sanguina aurantia compared to the cosmopolitan red snow alga Sanguina nivaloides (Chlorophyta) Tvůrce(i) Procházková, L. (CZ)
Remias, D. (AT)
Holzinger, A. (AT)
Řezanka, Tomáš (MBU-M) ORCID
Nedbalová, L. (CZ)Zdroj.dok. Polar Biology. - : Springer - ISSN 0722-4060
Roč. 44, č. 1 (2021), s. 105-117Poč.str. 13 s. Jazyk dok. eng - angličtina Země vyd. DE - Německo Klíč. slova Arctic ; Green algae ; Astaxanthin ; Polyunsaturated fatty acid ; Chlamydomonas nivalis ; Cryoflora Vědní obor RIV EE - Mikrobiologie, virologie Obor OECD Microbiology Výzkumná infrastruktura CzechPolar2 - 90078 - Masarykova univerzita Způsob publikování Open access Institucionální podpora MBU-M - RVO:61388971 UT WOS 000597434500001 EID SCOPUS 85097510837 DOI 10.1007/s00300-020-02778-0 Anotace Red snow caused by spherical cysts can be found worldwide, while an orange snow phenomenon caused by spherical cells is restricted to (Sub-)Arctic climates. Both bloom types, occurring in the same localities at Svalbard, were compared ecophysiologically. Using a combination of molecular markers and light- and transmission electron microscopy, cells were identified as Sanguina nivaloides and Sanguina aurantia (Chlorophyceae). In search for reasons for a cosmopolitan vs. a more restricted distribution of these microbes, significant differences in fatty acid and pigment profiles of field samples were found. S. aurantia accumulated much lower levels of polyunsaturated fatty acids (21% vs. 48% of total fatty acids) and exhibited lower astaxanthin-to-chlorophyll-a ratio (2-8 vs. 12-18). These compounds play an important role in adaptation to extreme conditions at the snow surface and within snow drifts. Accordingly, the performance of photosystem II showed that one third to nearly half of the photosynthetic active irradiation was sufficient in S. aurantia, compared to S. nivaloides, to become light saturated. Furthermore, formation of plastoglobules observed in S. nivaloides but missing in S. aurantia may contribute to photoprotection. The rapid light curves of the two species show to a certain extent the shade-adapted photosynthesis under the light conditions at Svalbard (high alpha-value 0.16 vs. 0.11, low saturation point I-k 59 vs. 86). These results indicate significant physiological and ultrastructural differences of the two genetically closely related cryoflora species, but the reasons why S. aurantia has not been found at conditions outside (Sub-)Arctic climate types remain unknown. Pracoviště Mikrobiologický ústav Kontakt Eliška Spurná, eliska.spurna@biomed.cas.cz, Tel.: 241 062 231 Rok sběru 2022 Elektronická adresa https://link.springer.com/article/10.1007%2Fs00300-020-02778-0
Počet záznamů: 1