Comparative mapping of the dwarf gene Bu from tropical pumpkin (Cucurbita moschata Duchesne)

A segregating BC6F2 population was developed using a dwarf mutant of Cucurbita moschata Duch.as donor and the vine C.maxima Duch.'Mengri'as recurrent parent.Using the segregating population,the gene Bu was comparatively mapped on chromosome 5 of cucumber.An intron-flanking marker IF3629 was found to be tightly linked to the Bu gene,with a genetic distance of 1.0 cM.The marker IF3629 will not only be useful in markers-assisted selection for dwarf plant,but also provide a starting point toward positional isolation of the dwarf Bu gene in squash.