Karyotype Analysis in Haploid Sugarbeet

Abstract

The mitotic chromosome morphology of the sugarbeet was studied in three haploid plants of independent origin. The average length of the nine metaphase chromosomes was 2.39 μm, varying from 1.97 to 2.78 μm. Three chromosomes had median centromeres, two had submedian centromeres, and four had mediansubmedian centromeres. All nine chromosomes may be identified on the basis of their total length and arm ratio when arranged in a specific manner, although there is a considerable risk of reversal-of-order error.