Segregation patterns of isozyme loci and microsatellite markers show the diploidy of African yam Dioscorea rotundata (2n = 40).
The cultivated yam species Dioscorea rotundata (2n = 40) has been considered by most authors as a tetraploid species with a basic chromosome number of ten. In this paper, we analysed the segregation of two isozyme loci and six microsatellite markers in the progeny of a self-fertilised monoecious plant. For the eight markers, segregation patterns could be explained by only two genetic models: diploidy or tetraploidy with two null alleles. Given the nature of studied markers, the most parsimonious hypothesis was that the parental plant was diploid. These results, data from a diversity survey and results of other authors led to the conclusion that D. rotundata is a diploid species.
Scarcelli
Nora
N
Equipe DYNADIV, UMR 1097 Diversité et Génomes des Plantes Cultivées, Institut de Recherche pour le Développement (IRD), Montpellier, France. nora.scarcelli@mpl.ird.fr
Daïnou
Ogoubi
O
Agbangla
Clément
C
Tostain
Serge
S
Pham
Jean-Louis
JL
D000349:Africa; D020090:Chromosome Segregation / Q000235:genetics*; D027742:Dioscorea / Q000235:genetics*; D004171:Diploidy; D014644:Genetic Variation; D007527:Isoenzymes; D018895:Microsatellite Repeats / Q000235:genetics; D008957:Models, Genetic
D007527:Isoenzymes