Retour au sommaireSCARCELLI N., DAINOU O., AGBANGLA C., TOSTAIN S.,
PHAM J.-L. 2005.
Segregation patterns of isozyme loci and microsatellite markers
show the diploidy of African yam Dioscorea rotundata (2 n= 40). Theor Appl Genet 111: 226–232.
Abstract :
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.