The Journal of Heredity 1987:78(6):366-368
© 1987 The American Genetic Association 78:366-368
research-article |
Nucleolar behavior in pollen mother cells in the pigeonpea
Crop Genetics Laboratory, School of Life Sciences, University of Hyderabad Hyderabad 5000134, India
ICRI-SAT Patancheru 502324, India
Abstract
Reports on the number of satellite chromosomes in the karyotype of Cajanus cajan are controversial, with the number varying from zero to two. Expression of nucleolar organizer chromosomes during melosis (prophase-I, telophase-I and telophase-II) is used as an index for the number of nucleolar organizers and conclusive evidence is provided for the presence of two nucleolar organizer chromosomes in Cajanus and also its related species in the genus Atylosia. Nucleolar number in an autotetraplold of Caianus confirmed the evidence from the diploid Cajanus for two nucleolar organizer chromosomes. Variation In the nucleolar size suggests that the two nucleolar organizer chromosomes differ in their activity.