Chromosome Analysis of in vitro Induced Androgenetic Haploids of Nicotiana tabacum

Abstract

The metaphase chromosomes of the haploid of N. tabacum under study can be divided in 3 groups, the first one being composed of two sub-groups depending on the centromeres position and the absolute length of the individual chromosomes. The third chromosome of the group of the sub-telocentric chromosomes has a satellite and can serve as a marker chromosome. The longest chromosome in the karyotype is that of the sub-group of large metacentric chromosomes while the shortest chromosome is the last one of the sub-group of small metacentric chromosomes. The highest percentage participation in the total length of the metaphase chromosomes is that of the group of metacentric chromosomes (42.75%), the lowest one being that of the group of sub-metacentric chromosomes (18.63%).