Cytogenetical Studies in Narenga porphyrocoma

Abstract
Meiosis and pollen mitosis were studied in 20 plants of Narenga porphyrocoma. The karyotype was analysed and found to be asymmetrical. Meiotic abnormalities such as bridges, laggards and cells with different chromosome numbers were observed. These mosaics probably result from one pair of homologous chromosomes possessing a weak centromere causing abnormalities in postmeiotic cell divisions.