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8 résultat(s) recherche sur le mot-clé 'morphométrie' 
trié(s) par (Pertinence décroissant(e), Titre croissant(e)) Affiner la recherche Générer le flux rss de la rechercheDetermination of taxa of the Achillea millefolium qroup and Achillea crithmifolia by morphological and hytochemical methods I. Characterisation of Central European taxa / Florian Rauchensteiner in Scientia pharmaceutica, vol. 70, n°2 (Année 2002)
Titre : Determination of taxa of the Achillea millefolium qroup and Achillea crithmifolia by morphological and hytochemical methods I. Characterisation of Central European taxa Type de document : périodique Auteurs : Florian Rauchensteiner, Auteur ; Shahbaz Nejati, Auteur ; Ingrid Werner, Auteur ; Sabine Glasl, Auteur ; Johannes Saukel, Auteur ; Johann Jurenitsch, Auteur ; Wolfgang Kubelka, Auteur Année de publication : 2002 Article en page(s) : pp. 199-230 Langues : Anglais Catégories : [Espèces (in biblio)] Achillea collina
[Espèces (in biblio)] Achillea setacea
[Thèmes] Clé de déterminationMots-clés : morphométrie ploïdie Résumé : "A survey of morphological and phytochemical data characteristic for several taxa of the Achillea millefoliurn group (A. aspleniifolia VENT., A. roseoalba EHREND., A. collina J. BECKER ex REICHENB., A. ceretanica SENNEN, A. setacea W. ET K., A. pratensis SAUKEL & LANGER, A. styriaca SAUKEL ined., A. pannonica SC H E ELE, A. distans W. ET K., A. millefolium s. I., A. millefolium ssp. sudetica OPIZ) and A. crithmifolia W. ET K. is presented. For each taxon a short morphological description and a guide for microscopic analysis is given as well as its sesquiterpene composition including the TLC characteristics. Based on GLC analyses of 1523 single plants collected in Central Europe the sums of sabinene + β-pinene + β-caryophyllene (SUM I), a-pinene + 1,8-cineole (SUM 2), camphene + camphor + borneol (SUM 3), camphene + camphor (SUM 4) and 1,8-cineole + borneol (SUM 5) were found to be highly significant for distinct taxa or groups of taxa." (source : auteurs) Type de publication : périodique Référence biblio : Rauchensteiner F., Nejati S., Werner I., Glasl S., Saukel J., Jurenitsch J., Kubelka W., 2002 - Determination of taxa of the Achillea millefolium qroup and Achillea crithmifolia by morphological and hytochemical methods I. Characterisation of Central European taxa. Scientia pharmaceutica, 70 (2) : 199-230. ID PMB : 71873 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=71873
in Scientia pharmaceutica > vol. 70, n°2 (Année 2002) . - pp. 199-230[article]Exemplaires
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Titre : Evolution, phylogeography, and taxonomy within the Viola alba complex (Violaceae) Type de document : Livre Auteurs : Thomas Marcussen, Auteur Année de publication : 2003 Article en page(s) : pp. 51-74 Langues : Anglais Catégories : [Espèces (in biblio)] Viola alba
[Thèmes] TaxonomieMots-clés : morphométrie allozyme phylogeographie évolution Résumé : " Taxa of the Viola alba complex were investigated using allozymes and morphometry. A taxonomic revision is presented. A wide delimitation of V. alba with only three morphological and geographical subspecies is suggested: (1) ssp. dehnhardtii distributed in the Mediterranean eastwards to Turkey; (2) ssp. alba flanking ssp. dehnhardtii in the north and east; and (3) ssp. cretica endemic to Crete. Ssp. cretica, up to now treated as a separate species, is particularly close to ssp. dehnhardtii. Viola cadevallii (NW Mediterranean) is included in the synonymy of ssp. dehnhardtii. Ssp. scotophylla (S Europe), ssp. thessala (Balkan), V. armena (Turkey), and V. besseri (Caucasus) are reduced to synonyms of V. alba ssp. alba. Viola pentelica (Greece) might represent transitional forms between ssp. alba and ssp. dehnhardtii. Glacial refugia for ssp. alba are suggested from the eastern Mediterranean via Turkey to the Caucasus, for ssp. dehnhardtii in the Mediterranean area in general, and for ssp. cretica in Crete. A key to the subspecies is provided. Taxonomic recombination: Viola alba Bess. ssp. cretica (Boiss. & Heldr.) Marcussen, comb. nov." (source : auteur) Type de publication : périodique Référence biblio : Marcussen T., 2003 - Evolution, phylogeography, and taxonomy within the Viola alba complex (Violaceae). Plant Systematics and Evolution, 237 : 51-74. ID PMB : 69162 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=69162
in Plant Systematics and Evolution > vol. 237 (Année 2003) . - pp. 51-74[article]Exemplaires
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Titre : Morphometric comparison of British Pseudorchis albida with Icelandic P. straminea (Orchidaceae: Orchidinae) Type de document : Livre Auteurs : Richard M. Bateman, Auteur ; Paula J. Rudall, Auteur ; I. Denholm, Auteur Année de publication : 2018 Article en page(s) : pp. 78-93 Langues : Anglais Catégories : [Espèces (in biblio)] Pseudorchis
[Espèces (in biblio)] Pseudorchis albida
[ZG] Royaume-Uni et Irlande
[Thèmes] TaxonomieMots-clés : conservation morphométrie spéciation aire de répartition Résumé : "Although the majority of taxonomic studies of European orchids treat Pseudorchis as a monotypic genus, some observers have argued that the apparently circumboreal segregate P. straminea should also be treated as a full species. Here, we compare detailed in vivo measurements of 55 plants from nine populations of P. albida in Britain with ten plants from three populations of P. straminea in Iceland, We apply morphometric statistics to data for 31 morphometric characters, culled from an original set of 36. We also review current (limited) DNA-based evidence of their evolutionary divergence. Of the 31 variable morphometric characters, 14 help to distinguish the two species, including labellum dimensions, spur length, flower colour, bract and leaf lengths, leaf colour and apical hooding. Molecular divergence (notably in ITS) approximates the lowest level needed for acceptance of species-level distinction, but thus far, the molecular information is typological and does not encompass seemingly intermediate populations of ‘P. tricuspis’ occurring in the mountains of central Europe. Pseudorchis has the potential to become a valuable model system for the study of speciation and subsequent inter-/post-glacial migration. Despite persistent rumours, we found no evidence that P. straminea (or ‘P. tricuspis’) occurs in the British Isles; nonetheless, this species should continue to be sought in suitable habitats in northern Scotland. Morphological variation within P. albida is comparatively low, though the most exposed of our study populations exhibits (presumably ecophenotypic) dwarfing." (source : auteurs) Type de publication : périodique Référence biblio : Bateman R., Rudall P., Denholm I., 2018 - Morphometric comparison of British Pseudorchis albida with Icelandic P. straminea (Orchidaceae: Orchidinae). New Journal of botany, 7 : 78-93. ID PMB : 66863 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=66863
in New Journal of botany > vol. 7, n°2-3 (Année 2017) . - pp. 78-93[article]Exemplaires
Cote Localisation Disponibilité P0130-5 Brest Exclu du prêt 
Titre : A morphometric study and revision of the Asplenium trichomanes group in the Czech Republic Type de document : Livre Auteurs : Libor Ekrt, Auteur ; Milan Stech, Auteur Année de publication : 2008 Article en page(s) : pp. 325-347 Langues : Anglais Catégories : [Espèces (in biblio)] Asplenium trichomanes
[Espèces (in biblio)] Asplenium trichomanes L. subsp. hastatum (H.Christ) S.Jess.
[Espèces (in biblio)] Asplenium trichomanes L. subsp. pachyrachis (H.Christ) Lovis & Reichst.
[Espèces (in biblio)] Asplenium trichomanes L. subsp. quadrivalens D.E.Mey.
[Espèces (in biblio)] Asplenium trichomanes L. subsp. trichomanes
[ZG] Europe centrale
[Thèmes] Fougères
[Thèmes] TaxonomieMots-clés : cytotype cytométrie morphométrie clé de détermination Résumé : "A detailed cytogeographic and morphometric study of the Asplenium trichomanes group in the Czech Republic is presented. We detected diploid (2n = 72), tetraploid (2n = 144) and hybrid triploid plants (2n = 108). Based on the morphometric study, four intraspecific taxa are recognized. These taxa correspond to the four subspecies of A. trichomanes (A. t. subsp, trichomanes, A. t. subsp, quadrivalens, A. t. subsp, pachyrachis and A. t. subsp, hastatum) distinguished in the floras of western, southern and northern Europe. Triploid plants were determined as A. t. nothosubsp. lusaticum (A. t. subsp, trichomanes × A. t. subsp, quadrivalens). The individual morphological characters used for determining subspecies are evaluated and a determination key presented." (source : auteurs) Type de publication : périodique Référence biblio : Ekrt L., Stech M., 2008 - A morphometric study and revision of the Asplenium trichomanes group in the Czech Republic. Preslia, 80 (3) : 325-347. ID PMB : 69850 En ligne : https://botanika.prf.jcu.cz/systematics/publikace/2008_Ekrt_Stech_Preslia_AspTri [...] Format de la ressource électronique : document Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=69850
in Preslia > vol. 80, n°3 (Année 2008) . - pp. 325-347[article]Exemplaires
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Titre : Natural hybridization between diploid Ficaria calthifolia and tetraploid Ficaria verna subsp. verna in central Europe : evidence from morphology, ecology and life-history traits Type de document : Livre Auteurs : Ondrej Popelka, Auteur ; Bohumil Travnicek (Trávníček, Bohumil), Auteur ; Pavla Siková (%u0160iková, Pavla), Auteur ; Michaela Jandová, Auteur ; Martin Duchoslav, Auteur Année de publication : 2019 Article en page(s) : pp. 179-212 Langues : Anglais Catégories : [Espèces (in biblio)] Ficaria calthifolia
[Espèces (in biblio)] Ficaria verna
[Thèmes] TaxonomieMots-clés : Ficaria × sellii bulbille cytométrie hybridation morphométrie phénologie viabilité du pollen polyploïdie Résumé : "The genusFicariais a taxonomically intricate group in which polyploidization and hybridizationcontribute to taxa diversification. Incentral Europe, populations of diploidF. calthifoliaandtetraploidF. vernasubsp.vernaoccasionally come into contact, which results in an interspecifictriploid hybrid, as recently demonstrated using molecular markers, genome size estimation andexperimental crossing. In this study, we aimedto estimate the frequency and distribution of thetriploid hybrid in central Europe, to identify those phenotypic traits that can be used to discrimi-nate between hybrid and parental taxa and compare the phenology, pollen viability, sexual andasexual reproduction and niche differentiation of the triploid hybrid and parental taxa. Flow-cytometry analyses of 1171 individuals sampledfrom 67 localities revealed that triploid hybridswere regularly found at 89% of the sites sampled where there were sympatric populations of bothparental taxa, with a mean percentage of 19.4% occurring at sites where there was a mixture ofcytotypes. No pure hybrid population was found. The hybrids were intermediate between theparental taxa in most morphological characters and did not show any novel morphological charac-ters. The characters that best differentiate the taxonomic groups were the production of axillarybulbils, aborted and well-developed achenes, leaf shape and plant habit. Almost all hybrids weresexually sterile: the pollen viability was considerably reduced (mean 8.4%) and on average 98%of the achenes were aborted. Local dispersal of the hybrids is possible through the production ofbulbils in the leaf axils, although the number of bulbils per node and the mean weight of one bulbilwere two and three times lower in the hybrid than inF. vernasubsp.verna.The hybrid niche wasintermediate between those of the parental taxa but shifted slightly towards that ofF. vernasubsp.verna. In addition, the taxonomic and nomenclatural treatment of the hybrid, which is describedasFicaria×selliiDuchoslav, Popelka et Trávn., as well as a key for identifying the central Euro-pean taxa ofFicaria, are presented." (source : auteurs) Type de publication : périodique Référence biblio : Popelka O., Travnicek B., Siková P., Jandová M., Duchoslav M., 2019 - Natural hybridization between diploid Ficaria calthifolia and tetraploid Ficaria verna subsp. verna in central Europe : evidence from morphology, ecology and life-history traits. Preslia, 91 : 179-212. ID PMB : 69008 DOI : 10.23855/preslia.2019.179 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=69008
in Preslia > vol. 91 (Année 2019) . - pp. 179-212[article]Exemplaires
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