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Journal of Cell Science, Vol 93, 615-622, Copyright © 1989 by Company of Biologists

Submitted on March 13, 1989
Accepted on May 11, 1989

Immunocytochemical detection of non-histone nuclear antigens in cryosections of developing somatic embryos from Daucus carota L

M. A. SANCHEZ-PINA 1, H. KIEFT 2, and J. H.N. SCHEL 2

1 Centro de Investigationes Biologicas (C.S.I.C.), Velasquez 144, 28006 Madrid, Spain
2 Department of Plant Cytology and Morphology, Agricultural University, Arboretumlaan 4, 6703 BD Wageningen, The Netherlands

Author for correspondence

The distribution of non-histone nuclear antigens was studied during early somatic embryogenesis of carrot using nuclear antibodies specific for small nuclear RNPs (snRNPs), nuclear matrix proteins and nucleolar proteins. Immunofluorescence showed that in interphase cells snRNPs and nuclear matrix proteins were localized in the nucleus with a speckled pattern. Immunoelectron microscopy indicated that the snRNPs were irregularly distributed while the nuclear matrix proteins showed a distribution preferentially over the condensed chromatin. None were localized in the nucleolus. The nucleolar proteins were localized in both dense fibrillar and granular components while the fibrillar centres were devoid of gold particles.

The localization of these antibodies in plant cell nuclei, in a way comparable to the patterns described in animal cells, indicates the general presence of snRNPs in all eukaryotic nuclei. It further confirms the relation of the nuclear matrix proteins to plant cell proliferation events and the possible role of the nucleolar proteins in both rRNA transcription and preribosome assembly.

Key words: nuclear proteins, immunocytochemistry, cryoultramicrotomy, carrot (Daucus carota L.), plant embryogenesis

Submitted on March 13, 1989
Accepted on May 11, 1989






© The Company of Biologists Ltd 1989