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5 résultat(s) recherche sur le mot-clé 'micromorphologie' 
trié(s) par (Pertinence décroissant(e), Titre croissant(e)) Affiner la recherche Générer le flux rss de la rechercheAchene micromorphology of 26 Crepis L. (Asteraceae) taxa from Turkey with notes on its systematic and ecological significance / Nursen Aksu Kalmuk in Botany letters, vol. 165, n°2 (Année 2018)
Titre : Achene micromorphology of 26 Crepis L. (Asteraceae) taxa from Turkey with notes on its systematic and ecological significance Type de document : Livre Auteurs : Nursen Aksu Kalmuk, Auteur ; Huseyin Inceer, Auteur ; Kemal Vehbi Imamoglu, Auteur Année de publication : 2018 Article en page(s) : pp. 292-306 Langues : Anglais Catégories : [ZG] Turquie
[Espèces (in biblio)] Crepis
[Thèmes] Ecologie
[Thèmes] TaxonomieMots-clés : Achene micromorphologie Résumé : "In this study, achene surface sculpturing and pappus ultrastructure of 26 Crepis taxa from Turkey were investigated using scanning electron microscopy (SEM). The achene microcharacters in the studied taxa were described here for the first time. Considerable differences in the shape of the epidermal cells and the ornamentation type of the outer cell wall have been found at interspecific levels. The differences in the achene surface sculpturing are also associated with achene dimorphism and habitat in some taxa. There are remarkable differences in the shape of the epidermal cells on the ribs of the achene among some clades within Crepis. The pappus ultrastructure is similar in all the taxa and is composed of spiky cells. Statistically significant difference has been found in the diameter of the pappus bristles among the taxa. It is concluded that achene micromorphology is useful for delimitation of the Crepis taxa. The microsculpture patterns on the ribs of the achene can also be used as a marker among major phylogenetic lineages as well as between closely related species. Additionally, the achene surface sculpturing could play an important role in the colonization of new habitats as well as in the adaptation to higher altitudes." (source : auteurs) Type de publication : périodique Référence biblio : Aksu Kalmuk N., Inceer H., Vehbi Imamoglu K., 2018 - Achene micromorphology of 26 Crepis L. (Asteraceae) taxa from Turkey with notes on its systematic and ecological significance. Botany letters, 165 (2) : 292-306. ID PMB : 68199 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=68199
in Botany letters > vol. 165, n°2 (Année 2018) . - pp. 292-306[article]Exemplaires
Cote Localisation Disponibilité P0177-6 Brest Exclu du prêt
Titre : A micromorphological and phylogenetic study of Sarcocornia A.J. Scott (Chenopodiaceae) on the Iberian Peninsula Type de document : Livre Auteurs : V. (de la) Fuente García, Auteur ; M. Oggerin, Auteur ; L. Rufo, Auteur ; N. Rodríguez, Auteur ; E. Ortúñez, Auteur ; D. Sanchez-Mata, Auteur ; R. Amils, Auteur Année de publication : 2013 Article en page(s) : pp. 158-173 Langues : Anglais Catégories : [Espèces (in biblio)] Sarcocornia
[ZG] Péninsule ibérique
[Thèmes] Bassin méditerranéenMots-clés : ITS micromorphologie graine Résumé : "This study presents a comprehensive revision of the genus Sarcocornia (Chenopodiaceae) on the Iberian Peninsula based on macromorphological, micromorphological and phylogenetic data, and considering caryological, ecological and biogeographical information. Three species of Sarcocornia have been identified on the Iberian Peninsula: Sarcocornia perennis (Miller) A.J. Scott, Sarcocornia fruticosa (L.) A.J. Scott and Sarcocornia alpini (Lag.) Rivas-Martínez. Several authors have proposed that S. alpini is a specific and subspecific rank of S. perennis. Fuente, Rufo and Sánchez-Mata have recently described a new species, Sarcocornia hispanica. The micromorphological and molecular studies (sequence of the internal transcribed spacer region) indicate that there is a broad diversity within Sarcocornia in the Western Mediterranean. This article proposes a new species (Sarcocornia pruinosa) and subspecies (S. alpini subsp. carinata) in view of the new data." (source : auteurs) Type de publication : périodique Référence biblio : Fuente García V. (de la), Oggerin M., Rufo L., Rodríguez N., Ortúñez E., Sanchez-Mata D., Amils R., 2013 - A micromorphological and phylogenetic study of Sarcocornia A.J. Scott (Chenopodiaceae) on the Iberian Peninsula. Plant Biosystems, 147 (1) : 158-173. ID PMB : 69035 DOI : 10.1080/11263504.2012.752414 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=69035
in Plant Biosystems > vol. 147, n°1 (Année 2013) . - pp. 158-173[article]Exemplaires
Cote Localisation Disponibilité aucun exemplaire
Titre : A new species in the Portulaca oleracea aggregate (Portulacaceae) from the Island of Soqotra (Yemen) Type de document : Livre Auteurs : Gianniantonio Domina, Auteur ; FRANCESCO M. Raimondo, Auteur Année de publication : 2009 Article en page(s) : pp. 9-12 Langues : Anglais Catégories : [ZG] Yémen
[Espèces (in biblio)] Portulaca oleraceaMots-clés : micromorphologie Résumé : "Una nuova specie appartenente all’aggregato Portulaca oleracea (Portulacaceae) descritta per l’Isola di Soqotra (Yemen) – Lostudio di recenti raccolte provenienti dall’isola di Socotra (Yemen) ha portato all’identificazione di una nuova specie di Portulaca appartenente all’aggregato di Portulaca oleracea. Questa nuova specie viene qui descritta col nome di Portulaca socotrana. Nell’arcipelago di Socotra sono presenti altre 5 specie di Portulaca, inclusa P. oleracea. La presenza di quest’ultima o l’attribuzione delle sue precedenti segnalazioni alla nuova specie restano da verificare." (source : auteurs) Type de publication : périodique Référence biblio : Domina G., Raimondo F., 2009 - A new species in the Portulaca oleracea aggregate (Portulacaceae) from the Island of Soqotra (Yemen). Webbia, 64 (1) : 9-12. ID PMB : 69437 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=69437
in Webbia > vol. 64, n°1 (Année 2009) . - pp. 9-12[article]Exemplaires
Cote Localisation Disponibilité aucun exemplaire
Titre : A study of Sarcocornia A.J. Scott (Chenopodiaceae) from Western Mediterranean Europe Type de document : Livre Auteurs : V. (de la) Fuente García, Auteur ; L. Rufoa, Auteur ; N. Rodríguez, Auteur ; D. Sánchez-Matad, Auteur ; A. Franco, Auteur ; R. Amils, Auteur Année de publication : 2016 Langues : Anglais Catégories : [Espèces (in biblio)] Sarcocornia
[ZG] Péninsule ibérique
[Thèmes] Bassin méditerranéenMots-clés : ITS micromorphologie graine stomate Résumé : "The latest publications on Sarcocornia taxonomy and phylogeny recognize six taxa in this genus on the Iberian Peninsula: S. perennis, S. fruticosa, S. alpini, S. alpini subsp. carinata, S. hispanica, and S. pruinosa. The present study represents a comprehensive revision of the different taxa in the Sarcocornia genus present in Western Mediterranean Europe by means of morphological, micromorphological and phylogenetic internal transcribed spacer (ITS) analysis. Morphological and micromorphological data were studied from Sarcocornia samples from 113 populations in coastal salt marshes and inland salt pans in Portugal, France, Spain and Italy. Sixteen new ITS sequences were obtained from Mediterranean Sarcocornia species and analysed together with previous reported data. Published karyological, ecological and biogeographical data from Western Mediterranean Europe were also reviewed. The results indicate the presence of a new species, S. lagascae, found growing in coastal Mediterranean areas of the Iberian Peninsula. The species S. fruticosa was found to be absent from the Iberian territories." (source : auteurs) Type de publication : périodique Référence biblio : Fuente García V. (de la), Rufoa L., Rodríguez N., Sánchez-Matad D., Franco A., Amils R., 2016 - A study of Sarcocornia A.J. Scott (Chenopodiaceae) from Western Mediterranean Europe. Plant Biosystems, 150 (2) : . ID PMB : 69034 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=69034
in Plant Biosystems > vol. 150, n°2 (Année 2016)[article]Exemplaires
Cote Localisation Disponibilité aucun exemplaire 
Titre : Seed morphometric characteristics of European species of Elatine (Elatinaceae) Type de document : Livre Auteurs : Agnieska Popiela ; Andrzej Lysko ; Bożenna Białecka ; Magdalena Marta Bihun ; Gábor Sramkó ; Waldemar Staron ; Anetta Wieczorek ; Attila Molnar Année de publication : 2017 Article en page(s) : e3399 Langues : Anglais Catégories : [Espèces (in biblio)] Elatinaceae
[Thèmes] TaxonomieMots-clés : espèce végétale amphibie clé de détermination micromorphologie morphologie population graine Résumé : "Elatine L. contains ca. 25 small, herbaceous, annual species distributed in ephemeral waters in both hemispheres. All species are amphibious and characterized by a high degree of morphological variability. The importance of seed morphology in Elatine taxonomy has been emphasized by many authors. The degree of seed curvature and seed coat reticulation have been traditionally considered very important in recognizing individual species of this genus. Seed morphometric characteristics of 10 Elatine species, including all European native taxa, are provided on the basis of material from two or three populations of each species. A total of 24–50 seeds were studied from each population, altogether 1,260 images were used for the morphometric study. In total, six parameters were measured from SEM pictures: object surface area, profile specific perimeter (object circuit), rectangle of the object (a) length, rectangle of the object (b) width, angle of the seed curvature, and number of pits in the seed coat counted in the middle row. Our study shows that the range of morphological variation of seeds in European species of Elatine is great, both between the species and the populations. Discrimination analysis showed that all six traits significantly differentiate the populations studied (λ = 0.001, p < 0.001), and the greatest contributions were “number of pits”, “rectangle_a”, and “the angle curvature”. Multidimensional scaling based on a correlation matrix of Mahalanobis distance of the six features studied revealed the greatest similarity between the three populations of E. alsinastrum, E. macropoda, and E. hexandra. Regarding interspecific differences, a Kruskal–Wallis tests showed that, in many cases, lack of statistically significant differences between species relative to the studied seed traits. If distinction of species is only based on seeds, especially if only a few seeds are evaluated, the following species pairs can be easily confused: E. alsinastrum and E. orthosperma, E. hexandra and E. macropoda, E. campylosperma and E. hydropiper, as well and E. gussonei and E. hungarica. We found no diversity in seed coat micromorphology within pits that could have potential taxonomic importance. An identification key and descriptions of species are provided on the basis of seeds traits." (source : auteurs) Type de publication : périodique Référence biblio : Popiela A., Lysko A., Białecka B., Bihun M., Sramkó G., Staron W., Wieczorek A., Molnar A., 2017 - Seed morphometric characteristics of European species of Elatine (Elatinaceae). PeerJ, 5 : e3399. DOI : https://doi.org/10.7717/peerj.3399 En ligne : https://peerj.com/articles/3399/ Format de la ressource électronique : document Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=67270
in PeerJ > 5 (Mai 2017) . - e3399[article]Exemplaires
Cote Localisation Disponibilité aucun exemplaire
