학술논문
Repetitive DNA as marker for the study of male gametogenesis in higher plants. I. Analysis in some species of Tradescantiaand Narcissus
Document Type
Article
Author
Source
Caryologia; January 1997, Vol. 50 Issue: 1 p67-76, 10p
Subject
Language
ISSN
00087114; 21655391
Abstract
SUMMARYThe use of heterochromatic regions, containing moderately repetitive DNA as markers, has allowed to follow the course of development of the generative and vegetative nuclei in the pollen grains of some species of Tradescantiaand Narcissus.It has been found that the chromocentres, relatives to the NOR-heterochromatin, are not randomly distributed. This implies the existence of a special mechanism governing the orientation of the centromeres in the spindle-shaped generative nuclei: a predisposition which may facilitate the mitotic process in the pollen tube.