Résultat de la recherche
2 recherche sur le mot-clé
'Chara vulgaris' 
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Partager le résultat de cette 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
in Botany letters > vol. 165, n°1 (Année 2018) . - pp. 77-89[article]Exemplaires(1)
Cote Localisation Disponibilité P0177-6 Brest Exclu du prêt
Titre : Studies in the charophyte flora and ecology of some post-industrial water bodies in County Durham (v.c. 66) Type de document : texte imprimé Auteurs : J. O'Reilly, Auteur ; D. W. Shimwell, Auteur Année de publication : 2018 Article en page(s) : pp. 152-159 Langues : Anglais (eng) Mots-clés : Chara vulgaris Chara hispida Chara virgata Nitella phytosociologie Résumé : "The reasons for the relatively small number of records for charophytes from County Durham (v.c. 66) in the 19th and 20th centuries are reviewed and the focus of recording on three specific areas is discussed. The augmentation of records is undertaken through four surveys of post-industrial water bodies in the period 2007–2013, specifically, of the Durham Magnesian Limestone Natural Area; Carboniferous Limestone quarries of Upper Weardale; lead mine reservoirs on the moorlands of the North Pennines Area of Outstanding Natural Beauty; lakes and ponds of the central Wear Valley. As a result of the surveys the charophyte database was more than doubled to 124 records for 16 taxa and 39 key sites identified from a total survey of 138 sites. The flora is compared with other local vice-county floras, the ecological and phytosociological aspects discussed and the prospects for conservation considered. Most of the sites were found to be relatively immune from the threat of eutrophication." Type de publication : périodique Référence biblio : O'Reilly J., Shimwell D.-W., 2018 - Studies in the charophyte flora and ecology of some post-industrial water bodies in County Durham (v.c. 66). New Journal of botany, 7 : 152-159. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=66882
in New Journal of botany > vol. 7, n°2-3 (Année 2017) . - pp. 152-159[article]Exemplaires(1)
Cote Localisation Disponibilité P0130-5 Brest Exclu du prêt
