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Polyphasic approach to a characteristic Ulva population from a limno–rheocrenic, mineral (chloride, sodium, sulphate) spring in the Siwa Oasis (Western Desert of Egypt)
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SYSNO ASEP 0496813 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Polyphasic approach to a characteristic Ulva population from a limno–rheocrenic, mineral (chloride, sodium, sulphate) spring in the Siwa Oasis (Western Desert of Egypt) Author(s) Saber, A. A. (EG)
Mareš, Jan (BC-A) RID, ORCID
Guella, G. (IT)
Anesi, A. (IT)
Štenclová, Lenka (BC-A) ORCID, RID
Cantonati, M. (IT)Source Title Fottea. - : Česká algologická společnost - ISSN 1802-5439
Roč. 18, č. 2 (2018), s. 227-242Number of pages 16 s. Language eng - English Country CZ - Czech Republic Keywords Ulva flexuosa subsp. paradoxa ; Chlorophyta ; Saharan habitats ; mineral spring ; morphotaxonomy Subject RIV EF - Botanics OECD category Plant sciences, botany Institutional support BC-A - RVO:60077344 UT WOS 000457025500010 DOI 10.5507/fot.2018.008 Annotation An interesting population of ulvacean green algae was collected from a limno-rheocrenic, thermal, mineral (chloride, sodium, sulphate) spring known as Ain Abu Sherouf in the Siwa Oasis, the Western Desert of Egypt. A detailed combined investigation on its morphotaxonomy, autecology, and a multilocus sequence data set including the chloroplast-encoded rbcL gene and the nuclear-encoded nrDNA SSU and ITS allowed us to identify this population as Ulva flexuosa subsp. paradoxa (syn. Ulva paradoxa, Ulvales, Chlorophyta), although the algal thalli were in average narrower than usual in this taxon. Analysis of the molecular rbcL-ITS sequencing data demonstrated a close phylogenetic relationship of the studied population to two Ulva isolates from Japan and China and their taxonomic status was further discussed. The pigment profiling confirmed chlorophylls and carotenoids typical of the Ulvaceae (lutein, α/β-carotenes, violaxanthin, and neoxanthin). Lipidomic analysis revealed the presence of the monogalactosyl diacylglycerols (MGDG), digalactosyl diacylglycerols (DGDG), sulfoquinovosyl diacylglycerols (SQDG), and diacylglyceryl N,N,N-trimethylhomoserine (DGTS) lipid classes. Presence of the plasma membrane DGTS lipids in remarkable proportion might be an adaptation to this nutrient-poor mineral spring habitat, with relatively low phosphorus values. The lower unsaturation index (UI) values of the plastidial DGDG and SQDG lipids are likely to reflect the need to maintain adequate membrane fluidity in this thermal mineral spring system. This polyphasic study not only extended our little knowledge on the distribution, autecology, and adaptive mechanisms of U. flexuosa subsp. paradoxa in the Saharan habitats of Africa, but also re-assessed and refined the taxonomic and phylogenetic affiliation of previously sampled close relatives from East Asia. Workplace Biology Centre (since 2006) Contact Dana Hypšová, eje@eje.cz, Tel.: 387 775 214 Year of Publishing 2019
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