La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Karyotype evolution and cytotaxonomy in Brazilian species of Rhynchospora Vahl (Cyperaceae)
Auteurs :	A. L. L. Vanzela, Auteur ; M. Luceño, Auteur ; M. Guerra, Auteur
Type de document :	Article
Dans :	Botanical Journal of the Linnean Society (134(4) 2000-12-01)
Article en page(s) :	557-566
Résumé :	Karyotypes were analysed in 113 populations of 34 species of Rhynchospora (Cyperaceae). They showed typical holocentric chromosomes lacking primary constrictions. Nucleolar constrictions were observed in the terminal regions of a few chromosomes (except in R. nanuzae, in which they were interstitial). The chromosome numbers varied between 2 = 4 and 2n = 50. The primary base number seems to be x = 5; x = 6 and x = 9 are secondary. Dysploidy occurred at low frequency, whereas polyploidy seemed to be the predominant event in the karyotype evolution of the genus. Karyotypic differences were found in R. consanguinea var. speciosa and R. consanguinea var. rigida and the closely related R. emaciata, R. riparia and R. tenuis from section Tenues. On the other hand, karyotypic similarities occurred among sections Valderugosae, Marisculae, Stenophyllae and Cernuae.
En ligne :	https://doi.org/10.1111/j.1095-8339.2000.tb00551.x

Lundi , mardi et jeudi de 9h à 12h et de 13h à 17h00 : ouverture au public ...