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Auteur S. Schneider |
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trié(s) par (Pertinence décroissant(e), Titre croissant(e)) Affiner la rechercheMorphological and molecular features of a Chara vulgaris population from desert springs on the Sinai Peninsula (Springs of Moses, Egypt) / Abdullah Antar Saber in Botany letters, vol. 165, n°1 (Année 2018)
Titre : Morphological and molecular features of a Chara vulgaris population from desert springs on the Sinai Peninsula (Springs of Moses, Egypt) Type de document : texte imprimé Auteurs : Abdullah Antar Saber, Auteur ; Andreas Ballot, Auteur ; S. Schneider, Auteur ; Marco Cantonati, Auteur Année de publication : 2018 Article en page(s) : pp. 77-89 Langues : Anglais (eng) Mots-clés : Chara vulgaris molecular phylogeny phenotypical adaptations mineral and thermal Springs of Moses Sinai Egypt Résumé : "We studied morphology and phylogeny of a Chara vulgaris (Charophytes, Charales) population sampled from the thermal “Springs of Moses” (Ayun Musa, Sinai, Egypt). Morphology of freshly sampled and cultivated materials was compared in order to quantify the influence of culturing conditions on morphological features. Cultivated material was shorter and had a smaller internode diameter than the freshly collected material. The bracteoles in the freshly collected material were distinctly longer (about 4–12 times the length of an oogonium) than those in the cultured material (about 2–4 times). Moreover, oogonia were slightly longer in the cultured material. Genetic analysis of the matK gene clearly identified the sampled specimens as Chara vulgaris. However, the freshly collected material was found to differ from “typical” Chara vulgaris populations in one morphological and one life-cycle feature. The thalli were fairly delicate, and the antheridia were shed early in both freshly collected and cultured materials, while oogonia were still in place. Most of the plants prepared and observed in this study were found to bear plenty of oogonia, whilst antheridia were often missing. Antheridia were only present on the newly formed branchlets at the stem apex. The peculiar morphology and life-cycle characteristics of this C. vulgaris population may be adaptations to this highly isolated and selective desert freshwater habitat." Type de publication : périodique Référence biblio : Antar Saber A., Ballot A., Schneider S., Cantonati M., 2018 - Morphological and molecular features of a Chara vulgaris population from desert springs on the Sinai Peninsula (Springs of Moses, Egypt). Botany letters, 165 (1) : 77-89. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=67245
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Titre : Towards an integrated understanding of charophyte biology and paleobiology Type de document : texte imprimé Auteurs : Mary Beilby, Auteur ; S. Schneider, Auteur ; Andrzej Puckacz, Auteur ; Carles Martin-Closas, Auteur Année de publication : 2018 Article en page(s) : pp. 7-10 Langues : Anglais (eng) Mots-clés : charophyte molecular genetics physiology ecology paleobotany Résumé : "In this special issue, we present an overview of the presentations given at the 7th Meeting of the International Research Group on charophytes held in Astana in 2016. Charophytes, understood as the members of extant Charales and their direct ancestors (fossil orders Sycidiales and Moellerinales), represent a significant plant group that provides an iconic research system for many diverse fields, such as evolution, ecology, electrophysiology, phytoremediation and management of wetlands. Charophytes have been proposed as one of the closest ancestors of land plants. Their fossil record goes back to 425 Ma (million years ago), but the rise of the oldest living charophyte genera is dated from ca 155–125 Ma. An example of vegetations already dominated by early Characeae has been recently found in China, dating back to that time. The definition of charophyte species has been a matter of debate, since the morphology of these plants shows a great plasticity. The elucidation of charophyte taxonomy is of major importance for the definition of endangered species. New light is shed by the use of genetic coding for the distinction of problematic species within the Chara genus. Climate change is one of the major concerns in the present scenario of disturbance of charophyte habitats. Specific adaptations, including changes in thallus morphology, parthenogenesis and enhanced production of oospores, develop when charophyte habitats become unstable, desiccate or increase their salinity. Brackish charophytes are also a subject of special attention, since they include species highly specialized in particular niches and highly vulnerable to extreme salinities reached through habitat desiccation. The chemistry of water controls the distribution of species, even at the biogeographic scale. Experiments, related to the transport of ions across the charophyte cell membrane, provide an understanding of how charophytes adapt physiologically to those changes." Type de publication : périodique Référence biblio : Beilby M., Schneider S., Puckacz A., Martin-Closas C., 2018 - Towards an integrated understanding of charophyte biology and paleobiology. Botany letters, 165 (1) : 7-10. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=67139
in Botany letters > vol. 165, n°1 (Année 2018) . - pp. 7-10[article]Exemplaires(1)
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