Ultrastructural Investigations of Nuclear Formations in Carnation Cells from Cultured Tissues

Abstract

Electron microscopic investigations on the cells obtained from tissue cultures of carnation (Dianthus caryophyllus var. Linda), have demonstrated the presence of two types of particular formations in the nucleus: a) electrondense loose bodies, composed of fibrillary structures; b) unelectrondense spherical-oval areas, with a slightly expressed structure. The possible connection of these structures with the nucleolus and nucleus-membrane functions, as well as their role in the rRNA synthesis and in the transfer processes through nucleus and cytoplasm, are discussed.