trié(s) par (Pertinence décroissant(e), Titre croissant(e)) 

Different genome sizes of Western and Eastern Ficaria verna lineages shed light on steps of Ficaria evolution / Detlev Drenckhahn in Forum Geobotanicum, vol. 7 (Année 2017)  

Public [article]  inForum Geobotanicum > vol. 7 (Année 2017) . - pp. 27-33 Titre : Different genome sizes of Western and Eastern Ficaria verna lineages shed light on steps of Ficaria evolution Type de document : texte imprimé Auteurs : Detlev Drenckhahn, Auteur ; Werner Baumgartner, Auteur ; Ben J. M. Zonneveld, Auteur Année de publication : 2017 Article en page(s) : pp. 27-33 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Ficaria calthifolia [Espèces (in biblio)] Ficaria verna Mots-clés : génome  cytométrie  évolution Résumé : "The genus Ficaria is now considered to comprize eight Eurasian species. The most widespread European species is the tetraploid F. verna Huds. The present study provides evidence for the existence of two main lineages of F. verna that differ considerably in their genome size by about 3 pg. A Western F. verna lineage west of river Rhine displays a mean genome size (2C-value) of 34.2 pg and is almost precisely codistributed with the diploid F. ambigua Boreau (20 pg) north of the Mediterranean. The remaining part of Europe appears to be occupied by the Eastern F. verna lineage solely (mean genome size of 31.3 pg) which codistributes in South-Eastern Europe with the diploid F. calthifolia Rchb. (15 pg). There is little overlap at the boundary of Western and Eastern F. verna lineages with the occurrence of a separate intermediate group in the Netherlands (mean genome size of 33.2 pg) that appears to result from hybridization of both lineages. On the basis of these observations and further considerations we propose development of F. ambigua and F. calthifolia south of the Alps with subsequent divergence to populate their current Western and Eastern European ranges, respectively. The Western F. verna lineage is proposed to originate from autotetraploidization of F. ambigua (precursor) with moderate genome downsizing and the Eastern F. verna lineage from auto¬tetraploidization of F. calthifolia (precursor)." (source : auteurs) Type de publication : périodique Référence biblio : Drenckhahn D., Baumgartner W., Zonneveld B.-M., 2017 - Different genome sizes of Western and Eastern Ficaria verna lineages shed light on steps of Ficaria evolution. Forum Geobotanicum, 7 : 27-33. ID PMB : 69006 DOI : 10.3264/FG.2017.1122 En ligne : http://www.forum-geobotanicum.net/articles/vol_7-2016/drenckhahn-baumgartner-zon [...] Format de la ressource électronique : document Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=69006 [article]

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Iconography of the Genus Hieracium in central Europe, Part 1. General Description and Morphotypes / Günter Gottschlich in Forum Geobotanicum, vol. 2 (Année 2005)

Public [article]  inForum Geobotanicum > vol. 2 (Année 2005) . - pp. 1-7 Titre : Iconography of the Genus Hieracium in central Europe, Part 1. General Description and Morphotypes Type de document : texte imprimé Auteurs : Günter Gottschlich, Auteur ; Detlev Drenckhahn, Auteur Année de publication : 2005 Article en page(s) : pp. 1-7 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Hieracium [ZG] Europe centrale Mots-clés : iconographie  classification  description  scanning electron micrographs Résumé : "The genus Hieracium comprises more than one thousand sexual and apomictic species in Europe, with numerous intermediates and microspecies. Only a small fraction of the members of the genus Hieracium has been illustrated or photo-documented in the literature. Since many of these publications are difficult to obtain, only a few specialists are familiar with most of the species and subspecies described in the literature. In order to overcome this problem and encourage geobotanical research on the genus Hieracium, we decided to edit an iconography of central and southern European Hieracia in an electronical journal (Forum geobotanicum) with free international access through the internet. Part I of this endeavour contains descriptions and photographs of the morphological spectrum of the genus Hieracium. Here, we categorize the genus into 15 basic morphotypes. These types conform partly to the sections and subsections of the genus Hieracium, but are in some cases informal and may even include members of different sections. Classification of morphotypes is considered helpful to obtain a first rough picture of an unknown species that then can be traced to the species and subspecies level by using keys or, after completion of this iconography, simply by screening the relevant images. One particularly novel aspect of the present endeavour will be the regular inclusion of magnified images and scanning electron micrographs." (source : auteurs) Type de publication : périodique Référence biblio : Gottschlich G., Drenckhahn D., 2005 - Iconography of the Genus Hieracium in central Europe, Part 1. General Description and Morphotypes. Forum Geobotanicum, 2 : 1-7. ID PMB : 55712 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=55712 [article]

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Panicle shoot, an overlooked stem type of several blackberries (Rubus, Rosaceae) / Detlev Drenckhahn in Willdenowia, vol. 49, n°1 (Année 2019)

Public [article]  inWilldenowia > vol. 49, n°1 (Année 2019) . - pp. 43-52 Titre : Panicle shoot, an overlooked stem type of several blackberries (Rubus, Rosaceae) Type de document : texte imprimé Auteurs : Detlev Drenckhahn, Auteur Année de publication : 2019 Article en page(s) : pp. 43-52 Langues : Anglais (eng) Résumé : "Blackberries (Rubus subg. Rubus, Rosaceae) are perennial plants that form thickets of biennial spiny stems (canes), which grow in length in the first year and develop flowering laterals in the second year. In the present study, a hitherto overlooked separate type of stem is described, denoted as panicle shoot (PS, turio paniculatus) that occurs in several species of all three European blackberry sections. PSs are up to 2.5 m long, spring directly from the rootstock, terminate apically in a mostly large paniculate inflorescence (simple type) and may develop additional flowering branches (complex type). PSs can emerge from young (two-year old) and older rootstocks established sexually from seeds and vegetatively from tip-rooted canes, respectively. As a rule, they are biennially flowering shoots that develop flowering laterals in the second season. By virtue of their length, PSs tend to project with their panicles out of the surface of bushes and hence overcome the frequent fate of flowering laterals of low arching canes to become rapidly overgrown and overshadowed by surrounding vegetation." (source : auteur) Type de publication : périodique Référence biblio : Drenckhahn D., 2019 - Panicle shoot, an overlooked stem type of several blackberries (Rubus, Rosaceae). Willdenowia, 49 (1) : 43-52. ID PMB : 68643 DOI : 10.3372/wi.49.49106 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=68643 [article]

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Cote	Localisation	Disponibilité
P0170	Brest	Exclu du prêt

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