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

Chromosome numbers of selected species of Elatine L. (Elatinaceae) / Anna Kalinka in Acta societatis botanicorum poloniae, vol. 84, n°4 (Année 2015)  

Public [article]  inActa societatis botanicorum poloniae > vol. 84, n°4 (Année 2015) . - pp. 413-417 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] Europe Mots-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 [article]

Exemplaires(0)

Disponibilité
aucun exemplaire

Flood induced phenotypic plasticity in amphibious genus Elatine (Elatinaceae) / Attila Molnar in PeerJ, 3 (2015)  

Public [article]  inPeerJ > 3 (2015) . - e1473 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 [article]

Exemplaires(0)

Disponibilité
aucun exemplaire

A study of the genetic variation of the aquatic fern Marsilea quadrifolia L. preserved in botanical collections in Poland and originated from natural populations in Europe / Agnieszka Janiak in Flora, vol. 209 (Année 2014)

Public [article]  inFlora > vol. 209 (Année 2014) . - pp. 655-665 Titre : A study of the genetic variation of the aquatic fern Marsilea quadrifolia L. preserved in botanical collections in Poland and originated from natural populations in Europe Type de document : texte imprimé Auteurs : Agnieszka Janiak, Auteur ; Katarzyna Galej, Auteur ; Jerzy B. Parusel, Auteur ; Iwona Szarejko, Auteur Année de publication : 2014 Article en page(s) : pp. 655-665 Langues : Anglais (eng) Catégories : [ZG] Pologne [habitats/milieux] 22 - Eaux douces stagnantes [Espèces (in biblio)] Marsilea quadrifolia L. Mots-clés : génétique  biologie de la conservation  plante aquatique Résumé : "Aim of the present study was to evaluate the genetic diversity of selected European populations of Marsilea quadrifolia L. and to assess the applicability of those genetic resources of Marsilea quadrifolia L. that have been preserved in Polish botanical gardens, for the reintroduction of this species into its historical range in Poland. Three Polish populations that originated from botanical collections (Zabrze,Ë™Zarów and PuÅ‚awy) and four natural populations (two from Slovakia (Slovakia I and Slovakia II), one from France and one from Germany) were analyzed using Amplified Fragment Length Polymorphism (AFLP) markers. A very low level of genetic variation was found both within and between the populations in the study, which likely resulted from a genetic bottleneck probably caused by human activities. Plants with the same AFLP fingerprint were found across several populations; however, singleton samples with a unique AFLP band pattern were also present within all of the populations. The presence of singletons led to relatively high values of Simpson’s diversity index, which may suggest a considerable effect of mutations and some possibility of sexual reproduction as sources of the observed variation. The partitioning of molecular variance was calculated using hierarchical AMOVA, which showed that a negligible value of only 0.81% of the variation was explained by the category of population, i.e. plants originating from the botanical collections or from the natural habitats. This result indicates that M. quadrifolia populations from botanical collections resemble natural populations in terms of the level of their genetic variation and that the populations that were obtained from the Polish collections could be used for the successful reintroduction of this species into its historical range in Poland, and a similar situation may be given also in other areas of occurrence of this plant that is under threat throughout its area of occurrence in Europe." (source : auteurs) Type de publication : périodique Référence biblio : Janiak A., Galej K., Parusel J., Szarejko I., 2014 - A study of the genetic variation of the aquatic fern Marsilea quadrifolia L. preserved in botanical collections in Poland and originated from natural populations in Europe. Flora, 209 : 655-665. ID PMB : 58982 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=58982 [article]

Exemplaires(0)

Disponibilité
aucun exemplaire

---

1 (1 - 3 / 3) Par page : 25 50 100 200