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Auteur Gábor Sramkó |
Documents disponibles écrits par cet auteur (6)
trié(s) par (Pertinence décroissant(e), Titre croissant(e)) Affiner la rechercheChromosome numbers of selected species of Elatine L. (Elatinaceae) / Anna Kalinka in Acta societatis botanicorum poloniae, vol. 84, n°4 (Année 2015)
Titre : Chromosome numbers of selected species of Elatine L. (Elatinaceae) Type de document : texte imprimé Auteurs : Anna Kalinka, Auteur ; Gábor Sramkó, Auteur ; Orsolya Horváth, Auteur ; Attila Molnar, Auteur ; Agnieszka Janiak, Auteur Année de publication : 2015 Article en page(s) : pp. 413-417 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Elatine
[ZG] Amérique du nord
[ZG] Asie
[ZG] EuropeMots-clés : génétique Résumé : "The paper reports chromosome numbers for 13 taxa of Elatine L., including all 11 species occurring in Europe, namely E. alsinastrum, E. ambigua, E. brachysperma, E. brochonii, E. californica, E. campylosperma, E. gussonei, E. hexandra, E. hungarica, E. hydropiper, E. macropoda, E. orthosperma, E. triandra originating from 17, field-collected populations. For seven of them (E. ambigua, E. californica, E. campylosperma, E. brachysperma, E. brochonii, E. hungarica, E. orthosperma) the chromosome numbers are reported for the first time. With these records, chromosome numbers for the whole section Elatinella Seub. became available. Although 2n = 36 was reported to be the most common and the lowest chromosome number in the genus, our data show that out of thirteen species analyzed, six had 36 chromosomes but five species had 54 chromosomes, and the lowest number of chromosomes was 18. These data further corroborates that the basic chromosome number in Elatine is x = 9." (source : auteurs) Type de publication : périodique Référence biblio : Kalinka A., Sramkó G., Horváth O., Molnar A., Janiak A., 2015 - Chromosome numbers of selected species of Elatine L. (Elatinaceae). Acta societatis botanicorum poloniae, 84 (4) : 413-417. ID PMB : 65404 En ligne : https://pbsociety.org.pl/journals/index.php/asbp/article/view/asbp.2015.036 Format de la ressource électronique : document Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=65404
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Titre : Flood induced phenotypic plasticity in amphibious genus Elatine (Elatinaceae) Type de document : texte imprimé Auteurs : Attila Molnar, Auteur ; János Pál Tóth, Auteur ; Gábor Sramkó, Auteur ; Orsolya Horváth, Auteur ; Agnieszka Janiak, Auteur ; Attila Mesterházy, Auteur ; Balázs Andras Lukacs, Auteur Année de publication : 2015 Article en page(s) : e1473 Langues : Anglais (eng) Mots-clés : adaptation macrophyte morphologie des graines culture graine charactéristique végétative Résumé : "Vegetative characters are widely used in the taxonomy of the amphibious genus Elatine L. However, these usually show great variation not just between species but between their aquatic and terrestrial forms. In the present study we examine the variation of seed and vegetative characters in nine Elatine species (E. brachysperma, E. californica, E. gussonei, E. hexandra, E. hungarica, E. hydropiper, E. macropoda, E. orthosperma and E. triandra) to reveal the extension of plasticity induced by the amphibious environment, and to test character reliability for species identification. Cultivated plant clones were kept under controlled conditions exposed to either aquatic or terrestrial environmental conditions. Six vegetative characters (length of stem, length of internodium, length of lamina, width of lamina, length of petioles, length of pedicel) and four seed characters (curvature, number of pits / lateral row, 1st and 2nd dimension) were measured on 50 fruiting stems of the aquatic and on 50 stems of the terrestrial form of the same clone. MDA, NPMANOVA Random Forest classification and cluster analysis were used to unravel the morphological differences between aquatic and terrestrial forms. The results of MDA cross-validated and Random Forest classification clearly indicated that only seed traits are stable within species (i.e., different forms of the same species keep similar morphology). Consequently, only seed morphology is valuable for taxonomic purposes since vegetative traits are highly influenced by environmental factors." (source : auteurs) Type de publication : périodique Référence biblio : Molnar A., Pál Tóth J., Sramkó G., Horváth O., Janiak A., Mesterházy A., Lukacs B., 2015 - Flood induced phenotypic plasticity in amphibious genus Elatine (Elatinaceae). PeerJ, 3 : e1473. ID PMB : 65364 En ligne : https://peerj.com/articles/1473.pdf Format de la ressource électronique : document Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=65364
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Titre : Himantoglossum hircinum (Lizard Orchid) reviewed in the light of new morphological and molecular observations Type de document : texte imprimé Auteurs : Richard M. Bateman, Auteur ; Paula J. Rudall, Auteur ; Julie A. Hawkins, Auteur ; Gábor Sramkó, Auteur Année de publication : 2013 Article en page(s) : pp. 122-140 Langues : Anglais (eng) Catégories : [ZG] Royaume-Uni
[Espèces (in biblio)] Himantoglossum hircinum (L.) Spreng.Mots-clés : ontogenèse florale répartition géographique espaceur interne transcrit LEAFY morphométrique changement climatique Résumé : "Himantoglossum hircinum is one of the rarer and more charismatic orchids in the British flora. Morphometric comparison of the two largest and best-known populations in southern England – the coastal dune population at Sandwich and the chalk grassland population at Newmarket – using 46 characters showed that they differ only subtly, the Sandwich plants being on average more vegetatively robust and slightly more darkly pigmented, but possessing less extensive lip-spots and substantially longer ‘arms’. A comparatively morphologically divergent semi-desert population from Ifrane, Morocco differs from the English populations in having broader stems, less recurved ‘arms’, a more strongly down-curved spur and in lacking near-circular spots within the sepals. Molecular comparison of 46 plants, representing 13 English populations and 18 populations from Continental Europe and Morocco, revealed only subtle distinctions in the high-copy nuclear region ITS, and smaller-scale comparisons of the low-copy nuclear (LEAFY) and plastid (four intron) regions proved to be even less discriminatory. These results reinforce prior morphological inferences that H. hircinum is a cohesive species. Scanning electron microscopy elucidated the ontogeny of these remarkable flowers, suggesting that the exceptionally elongate central labellar lobe originated by accelerated heterochronic growth and showing that the characteristic spiral torsion always runs counter-clockwise. Lateral fusion of the paired viscidia is convergent with several other lineages of subtribe Orchidinae. Review of pollination and life-history features of H. hircinum suggest that they are typical of food-deceptive species within Orchidinae. The Lizard Orchid is infamous for geographic mobility; its cycles of expansion and contraction through the last century have been interpreted as reflecting a net northward migration in response to recent climate change. Our data tentatively suggest relatively recent colonisation of Morocco at high altitudes and an overall northwestward direction of migration into the UK. ITS ribotypes indicate multiple immigration events leading to levels of genetic diversity in England comparable with those on the Continent. A non-recent origin is inferred for H. hircinum which, despite recent systematic revisions, may harbour further cryptic species; the taxonomic status of supposed outlying populations in southern Italy in particular is questioned by the present genetic data." (source : auteurs) Type de publication : périodique Référence biblio : Bateman R., Rudall P., Hawkins J., Sramkó G., 2013 - Himantoglossum hircinum (Lizard Orchid) reviewed in the light of new morphological and molecular observations. New Journal of botany, 3 (2) : 122-140. ID PMB : 57097 DOI : 10.1179/2042349713Y.0000000025 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=57097
in New Journal of botany > vol. 3, n°2 (Année 2013) . - pp. 122-140[article]Exemplaires(1)
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Titre : Integrating restriction site-associated DNA sequencing (RAD-seq) with morphological cladistic analysis clarifies evolutionary relationships among major species groups of bee orchids Type de document : texte imprimé Auteurs : Richard M. Bateman, Auteur ; Gábor Sramkó, Auteur ; Ovidiu Paun, Auteur Année de publication : 2018 Article en page(s) : pp. 85-105 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Ophrys Mots-clés : biogéographie évolution morphologie phylogénétique systématique pseudo-copulation séquençage génétique Résumé : "Bee orchids (Ophrys) have become the most popular model system for studying reproduction via insect-mediated pseudo-copulation and for exploring the consequent, putatively adaptive, evolutionary radiations. However, despite intensive past research, both the phylogenetic structure and species diversity within the genus remain highly contentious. Here, we integrate next-generation sequencing and morphological cladistic techniques to clarify the phylogeny of the genus.
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The comparatively high level of morphological homoplasy reflects extensive convergence, whereas the derived placement of the fusca group is attributed to paedomorphic simplification. The phenotype of the most recent common ancestor of the extant lineages is inferred, but it post-dates the majority of the character-state changes that typify the genus. RAD-seq may represent the high-water mark of the contribution of molecular phylogenetics to understanding evolution within Ophrys; further progress will require large-scale population-level studies that integrate phenotypic and genotypic data in a cogent conceptual framework." (source : auteurs)Type de publication : périodique Référence biblio : Bateman R., Sramkó G., Paun O., 2018 - Integrating restriction site-associated DNA sequencing (RAD-seq) with morphological cladistic analysis clarifies evolutionary relationships among major species groups of bee orchids. Annals of Botany, 121 (1) : 85-105. En ligne : https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5786241/pdf/mcx129.pdf Format de la ressource électronique : document Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=67821
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Titre : Molecular phylogenetics, seed morphometrics, chromosome number evolution and systematics of European Elatine L. (Elatinaceae) species Type de document : texte imprimé Auteurs : Gábor Sramkó, Auteur ; Attila Molnar, Auteur ; János Pál Tóth, Auteur ; Levente Laczkó, Auteur ; Anna Kalinka, Auteur ; Orsolya Horváth, Auteur ; Lidia Skuza, Auteur ; Balázs Andras Lukacs, Auteur ; Agnieska Popiela, Auteur Année de publication : 2016 Article en page(s) : e2800 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Elatinaceae Mots-clés : hybridation phylogénie évolution Résumé : "The genus Elatine contains ca 25 species, all of which are small, herbaceous annuals distributed in ephemeral waters on both hemispheres. However, due to a high degree of morphological variability (as a consequence of their amphibious life-style), the taxonomy of this genus remains controversial. Thus, to fill this gap in knowledge, we present a detailed molecular phylogenetic study of this genus based on nuclear (rITS) and plastid (accD-psaI, psbJ-petA, ycf6-psbM-trnD) sequences using 27 samples from 13 species. On the basis of this phylogenetic analysis, we provide a solid phylogenetic background for the modern taxonomy of the European members of the genus. Traditionally accepted sections of this tree (i.e., Crypta and Elatinella) were found to be monophyletic; only E. borchoni—found to be a basal member of the genus—has to be excluded from the latter lineage to achieve monophyly. A number of taxonomic conclusions can also be drawn: E. hexandra, a high-ploid species, is most likely a stabilised hybrid between the main sections; E. campylosperma merits full species status based on both molecular and morphological evidence; E. gussonei is a more widespread and genetically diverse species with two main lineages; and the presence of the Asian E. ambigua in the European flora is questionable. The main lineages recovered in this analysis are also supported by a number of synapomorphic morphological characters as well as uniform chromosome counts. Based on all the evidence presented here, two new subsections within Elatinella are described: subsection Hydropipera consisting of the temperate species of the section, and subsection Macropodae including the Mediterranean species of the section." (source : auteurs) Type de publication : périodique Référence biblio : SRAMKÓ G., MOLNAR A., PÁL TÓTH J., LACZKÓ L., KALINKA A., HORVÁTH O., SKUZA L., ANDRAS LUKACS B., POPIELA A., 2016 - Molecular phylogenetics, seed morphometrics, chromosome number evolution and systematics of European Elatine L. (Elatinaceae) species. PeerJ, 4 : e2800 ; DOI 10.7717/peerj.2800 ID PMB : 65363 DOI : 10.7717/peerj.2800 En ligne : https://peerj.com/articles/2800/ Format de la ressource électronique : document Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=65363
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