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Exemplaires(1)
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Dépouillements
Ajouter le résultat dans votre panierA study of floral shape variation in Delphinieae (Ranunculaceae) using geometric morphometrics on herbarium specimens / Yiyun Chen in Botany letters, vol. 165, n°3-4 (Année 2018)
Titre : A study of floral shape variation in Delphinieae (Ranunculaceae) using geometric morphometrics on herbarium specimens Type de document : texte imprimé Auteurs : Yiyun Chen, Auteur ; Florian Jabbour, Auteur ; Andriy Novikov, Auteur ; Wei Wang, Auteur ; Sylvain Gerber, Auteur Année de publication : 2018 Article en page(s) : pp. 368-376 Langues : Anglais (eng) Mots-clés : Aconitum Delphinium flower morphology nectar spur Staphisagria taxonomie Résumé : "The variation in the shape of flowers, the reproductive structures of angiosperms, is generally investigated in a qualitative way, or using multivariate statistical analyses of distance data (i.e. traditional morphometrics). In this study, we evaluate the application of geometric morphometric methods to flowers of herbarium specimens, a material that is still being massively overlooked as far as these methods are concerned. Flowers of Delphinieae (Ranunculaceae) are synorganized: the spurred and nectariferous dorsal petals are nested within the spur or hood of the dorsal sepal. The study of synorganized structures is challenging, and geometric morphometric-oriented investigation may provide working hypotheses for an evo-devo exploration of such hyperorgan formation. We analyze here the floral shape of Delphinieae using geometric morphometric methods and demonstrate the effectiveness of these methods on dry and compressed flowers. We also show the diagnostic value of the dorsal half of the perianth of the Delphinieae flower, and suggest some trends to help design future studies on the evolutionary development of spur formation and the co-evolution of Delphinieae flowers with their pollinators." Type de publication : périodique Référence biblio : Chen Y., Jabbour F., Novikov A., Wang W., Gerber S., 2018 - A study of floral shape variation in Delphinieae (Ranunculaceae) using geometric morphometrics on herbarium specimens. Botany letters, 165 : 368-376. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=68143
in Botany letters > vol. 165, n°3-4 (Année 2018) . - pp. 368-376[article]Exemplaires(1)
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Titre : Distribution area of the two floral morphs of Nigella damascena L. (Ranunculaceae) : a diachronic study using herbarium specimens collected in France Type de document : texte imprimé Auteurs : Catherine Damerval, Auteur ; Wafa Ben Othman, Auteur ; Domenica Manicacci, Auteur ; Florian Jabbour, Auteur Année de publication : 2018 Article en page(s) : pp. 396-403 Langues : Anglais (eng) Catégories : [ZG] France
[Espèces (in biblio)] Nigella damascena L.Mots-clés : évolution morphologique spécimen d’herbier dimorphisme floral Résumé : "Perianth dimorphism in Nigella damascena (Ranunculaceae) has been documented for four centuries, and its genetic basis started to be studied almost a century ago. Based on herbarium collections, we reconstructed the evolution of the distribution area of the wild-type (perianth composed of a calyx and nectariferous petals) and mutant (apetalous) floral morphs in mainland France over the last two centuries. We showed that the collection localities of the wild-type morph are mostly concentrated in the southern coastal areas of France, whereas the collection localities of the mutant morph were less numerous but more scattered in France. The collection effort of both morphs peaked in the second half of the nineteenth century and continuously decreased afterwards. Results are interpreted taking into account the biases in the constitution of a herbarium collection. Knowledge about the spatial distribution and the frequency of occurrence of wild-type and mutant populations through time will help botanists and evolutionary biologists investigate the origin and ecological grounds for the maintenance and propagation of the apetalous morph in the wild." (source : auteurs) Type de publication : périodique Référence biblio : Damerval C., Ben Othman W., Manicacci D., Jabbour F., 2018 - Distribution area of the two floral morphs of Nigella damascena L. (Ranunculaceae) : a diachronic study using herbarium specimens collected in France. Botany letters, 165 : 396-403. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=68144
in Botany letters > vol. 165, n°3-4 (Année 2018) . - pp. 396-403[article]Exemplaires(1)
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Titre : Letters to the twenty-first century botanist. Second series : “ what is a seed? ” – 3. How did we get there? Palaeobotany sheds light on the emergence of seed Type de document : texte imprimé Auteurs : Brigitte Meyer-Berthaud, Auteur ; Philippe Gerrienne, Auteur ; Cyrille Prestianni, Auteur Année de publication : 2018 Article en page(s) : pp. 434-439 Langues : Anglais (eng) Mots-clés : graine ovule paléozoïque tégument nucelle spermatophyte paléobotanique systématique Résumé : "This paper discusses the main steps leading to the acquisition, during the Palaeozoic, of the seed habit. The earliest spermatophytes originated in the Late Devonian and produced small cupulate ovules characterized by an elaborated sporangial apex involved in pollination. The diversification of ovules during the Carboniferous led to a wider range of sizes and shapes, and an increasing importance of the integument. The earliest seeds containing embryos are reported in Carboniferous coniferophytes" (source : auteurs) Type de publication : périodique Référence biblio : Meyer-Berthaud B., Gerrienne P., Prestianni C., 2018 - Letters to the twenty-first century botanist. Second series : “ what is a seed? ” – 3. How did we get there? Palaeobotany sheds light on the emergence of seed. Botany letters, 165 : 434-439. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=68145
in Botany letters > vol. 165, n°3-4 (Année 2018) . - pp. 434-439[article]Exemplaires(1)
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Titre : Monographs of Invasive Plants in Europe n°3 : Carpobrotus Type de document : texte imprimé Auteurs : Josefina G. Campoy ; Alicia T.R. Acosta ; Laurence Affre ; Rodolfo Barreiro ; Giuseppe Brundu ; Elise Buisson ; Luis Gonzales ; Margarita Lema ; Ana Novoa ; Ruben Retuerto ; Sergio R. Roiloa ; J. Fagúndez Année de publication : 2018 Article en page(s) : pp. 440-475 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Carpobrotus acinaciformis
[Espèces (in biblio)] Carpobrotus edulisMots-clés : espèce végétale exotique envahissante interaction biotique contrainte écologique écophysiologie impact environnemental potentialité d'hybridation méthode de lutte stratégie de reproduction aire de répartition Résumé : "This report synthesizes all aspects of the taxonomy, distribution, history of introduction and spread, ecological constrains (including preferred climate, substratum and habitats), responses to biotic and abiotic factors, biology (including phenology, vegetative and reproductive biology), economic importance and human uses, ecological impacts, legislation and management of Carpobrotus N.E.Br. (Aizoaceae), a prominent invasive plant in Europe.
Carpobrotus species are mat-forming trailing succulent perennial herbs native from South Africa, introduced in Europe for ornamental and soil stabilization purposes since the beginning of the seventeenth century, now widely naturalized on coastal habitats of southern and western Europe. C. acinaciformis and C. edulis are the main species recognized outside South Africa, together with their hybrids and potential hybrid swarms. Identification conflicts both in the native and invaded areas raise doubts on the taxonomy of these taxa, but hybridization processes may boost adaptive changes in the invaded range.
The release of Carpobrotus in natural environments and protected areas is prohibited in several European countries, but this taxon is not included in the list of invasive species of Union concern. Carpobrotus is a pioneer of disturbed sites and coastal areas including cliffs and sand dune systems, due to its tolerance to stress factors such as salinity, drought and excess of light. Carpobrotus invasion ultimately affects patterns of native species diversity. Moreover, it has been recognized as a major driver of soil conditions shifts and soil geochemical processes disruptions, representing a serious threat for coastal habitats.
Management plans for Carpobrotus must consider its high plasticity for morphological and ecophysiological traits, which may probably explain its tolerance to a wide range of ecological conditions. Its flexible mating systems, which represent an optimal strategy to facilitate local adaptation and habitat colonization, include ability to produce apomictic seeds, self- and cross-pollination, and an intense vegetative clonality. In addition, Carpobrotus produces a large seed bank with a moderate short-term persistence, and fruits are effectively dispersed by mammals. The most efficient control methods are physical removal and herbicide application on leaves, whereas integration of biological control with other conventional management methods are likely to be most effective. A long-term monitoring of control actions and restoration of soil conditions are needed to prevent recovering from clonal parts, seed bank or mammal faeces as well as potential new invasions by other opportunistic species." (source : auteurs)Type de publication : périodique Référence biblio : Campoy J., Acosta A.-R., Affre L., Barreiro R., Brundu G., Buisson E., Gonzales L., Lema M., Novoa A., Retuerto R., Roiloa S., Fagúndez J., 2018 - Monographs of Invasive Plants in Europe n°3 : Carpobrotus. Botany letters, 165 : 440-475. ID PMB : 68146 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=68146
in Botany letters > vol. 165, n°3-4 (Année 2018) . - pp. 440-475[article]Titre suivantExemplaires(1)
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Titre : Contrasting phylogeographic structures between freshwater lycopods and angiosperms in the British Isles Type de document : texte imprimé Auteurs : Daniel Wood, Auteur ; Jill Olofsson, Auteur ; Sscott McKenzie, Auteur ; Luke Dunning, Auteur Année de publication : 2018 Article en page(s) : pp. 476-486 Langues : Anglais (eng) Mots-clés : Littorella Isoetes RAD-Seq reproductive system ecotype UK macrophyte Résumé : "Aquatic plants face many novel challenges compared to their terrestrial counterparts. The habitat they occupy is typically highly fragmented, with isolated water bodies surrounded by swathes of “dry desert”. This can result in reduced gene flow, inbreeding, and potentially local extinction. The level of gene flow and degree of genetic structure in these species is also likely to be influenced by the mating system they adopt. To test this hypothesis we compare the phylogeographic structure of two freshwater plants in the British Isles, the largely clonal angiosperm Littorella uniflora, and the heterosporous lycopod Isoetes lacustris. We sampled both plants from lakes where they co-occur, and used restriction site-associated DNA sequencing (RAD-Seq) to infer their relationships. Genetic structure among lakes is higher in the angiosperm, which we associate with reduced sexual reproduction, and hence lower levels of gene flow between lakes. Furthermore, we found evidence of lineage-specific association to certain lake nutrient types in L. uniflora, which might result from environmental filtering of specific ecotypes. Overall, we conclude that the reproductive system of lycopods, which is less specialized to terrestrial conditions, provides an advantage following the secondary colonization of aquatic habitats by enabling frequent genetic exchanges between populations and potentially facilitating faster adaptation." Type de publication : périodique Référence biblio : Wood D., Olofsson J., McKenzie S., Dunning L., 2018 - Contrasting phylogeographic structures between freshwater lycopods and angiosperms in the British Isles. Botany letters, 165 : 476-486. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=68147
in Botany letters > vol. 165, n°3-4 (Année 2018) . - pp. 476-486[article]Exemplaires(1)
Cote Localisation Disponibilité P0177-6 Brest Exclu du prêt
