Studies on Nucleolus and Nucleolar Chromosomes in Angiosperms

VII. Nature of nucleolar chromosome polymorphism in Allium cepa var. viviparum (Metzg.) Alef

Abstract

Numerical polymorphism of nucleolar chromosomes has been recorded among various clones of Allium cepa var. viviparum. Loss of visibility of satellites in some plants is accompanied by proportionate reduction in nucleolar number. In some plants, however, nucleolar organization is not impaired by morphological reduction of satellites. Change in number of satellites and nucleoli is seen to tell upon plant fertility.