The 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 Tradescantia and 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.
Repetitive DNA as marker for the study of male gametogenesis in higher plants .1. Analysis in some species of Tradescantia and Narcissus / S., Suzzi; G. c., Vosa; Bassi, Paola. - In: CARYOLOGIA. - ISSN 0008-7114. - STAMPA. - 50:1(1997), pp. 67-76.
Repetitive DNA as marker for the study of male gametogenesis in higher plants .1. Analysis in some species of Tradescantia and Narcissus
BASSI, Paola
1997
Abstract
The 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 Tradescantia and 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
