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Auteur Andreas Ballot |
Documents disponibles écrits par cet auteur (3)
trié(s) par (Pertinence décroissant(e), Titre croissant(e)) Affiner la rechercheCharophytes in warm springs on Svalbard (Spitsbergen) : DNA barcoding identifies Chara aspera and Chara canescens with unusual morphological traits / Anders Langangen in Botany letters, vol. 167, n°2 (Année 2020)
Titre : Charophytes in warm springs on Svalbard (Spitsbergen) : DNA barcoding identifies Chara aspera and Chara canescens with unusual morphological traits Type de document : texte imprimé Auteurs : Anders Langangen, Auteur ; Andreas Ballot, Auteur ; Petra Nowak, Auteur ; Suzanne Schneider, Auteur Année de publication : 2020 Article en page(s) : pp. 179-186 Langues : Anglais (eng) Catégories : [ZG] Norvège
[Thèmes] Charophytes / CharacéesMots-clés : MATK (Megakaryocyte-Associated Tyrosine Kinase) Chara aspera Chara canescens morphologie génétique Résumé : "The Troll springs are warm springs on Svalbard (Spitsbergen). Charophytes were collected in the years 1910, 1912, 1958, 1992/1993, and 2018. However, since the Chara samples showed unusual morphological traits, there were doubts with respect to species identity. We here use DNA barcoding to show that there occur two Chara species in the Troll springs: Chara aspera and C. canescens." (source : auteurs) Type de publication : périodique Référence biblio : Langangen A., Ballot A., Nowak P., Schneider S., 2020 - Charophytes in warm springs on Svalbard (Spitsbergen) : DNA barcoding identifies Chara aspera and Chara canescens with unusual morphological traits. Botany letters, 167 (2) : 179-186. ID PMB : 69484 DOI : 10.1080/23818107.2019.1672104 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=69484
in Botany letters > vol. 167, n°2 (Année 2020) . - pp. 179-186[article]Exemplaires(1)
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Titre : Genetic and morphological variation in Chara contraria and a taxon morphologically resembling Chara connivens Type de document : texte imprimé Auteurs : Ivana Trbojevic, Auteur ; Aleksandra Markovic, Auteur ; Jelena Blazencic, Auteur ; Gordana Subakov Simic, Auteur ; Petra Nowak, Auteur ; Andreas Ballot, Auteur ; Suzanne Schneider, Auteur Année de publication : 2020 Article en page(s) : pp. 187-200 Langues : Anglais (eng) Catégories : [Thèmes] Charophytes / Characées Mots-clés : génétaique morphologie MATK (Megakaryocyte-Associated Tyrosine Kinase) Chara contraria Chara connivens comparaison d'espèces Résumé : "Charophyte species delineation is regularly based on a set of thallus morphological characteristics, but considering pronounced phenotypic plasticity, difficulties and doubts commonly occur in Chara species determination. DNA barcoding may contribute to solving these challenges. Here we characterize Chara contraria with an unusual set of morphological characteristics, and specimens morphologically resembling Chara connivens collected in Serbia, by describing their morphological traits and analysing matK barcoding results. Our results indicated that dioecious Chara specimens, tentatively determined as Chara “connivens” based on morphological traits, were genetically more closely related to C. globularis. These Chara “connivens” specimens formed a sister group to a monophyletic C. globularis cluster, suggesting that it may be neither C. connivens nor C. globularis. We strongly encourage further barcoding of C. “connivens” samples from freshwater, in order to find out if there are consistent genetic differences between the dioecious freshwater C. “connivens” and monoecious C. globularis. Barcoding of matK placed the monoecious Chara specimens, which based on morphological characteristics initially were determined as C. virgata, into the C. contraria group. This indicates that the microscopic traits which commonly are used for Chara species determination sometimes are misleading. In general, our study challenges the commonly used phenetic species concept in Charophyte taxonomy and illustrates the importance of molecular approaches to evaluate the validity of morphological characteristics of the plant thallus in species delineation." (source : auteurs) Type de publication : périodique Référence biblio : Trbojevic I., Markovic A., Blazencic J., Subakov Simic G., Nowak P., Ballot A., Schneider S., 2020 - Genetic and morphological variation in Chara contraria and a taxon morphologically resembling Chara connivens. Botany letters, 167 (2) : 187-200. ID PMB : 69485 DOI : 10.1080/23818107.2019.1703808 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=69485
in Botany letters > vol. 167, n°2 (Année 2020) . - pp. 187-200[article]Exemplaires(1)
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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
