Summary
Nuclease-colloidal gold complexes and silver staining were used to visualize intranucleolar nucleic acids and argyrophilic proteins of the nucleolar organizers in bud cotyledonary cells ofPisum sativum. In the G0–1 inhibited bud, a few RNA molecules were detected in the fibrillar component and in the unique fibrillar centre, close to the boundary with the fibrillar component of the nucleolus. DNA was present in the fibrillar component, in the fibrillar centre and in a few fibres crossing the perinucleolar halo. The acidic proteins were localized at the periphery of the fibrillar component but they were also present in the unique fibrillar centre. In the reactivated bud, RNA was particularly concentrated in the granular component and along fibres crossing the perinucleolar halo; a few RNA molecules were also detected at the boundary between the small fibrillar centres and the fibrillar component. DNA was localized in the same nucleolar component as in the inhibited bud, but it was distributed between several fibrillar centres. Acidic proteins coated these DNA loci. In the inhibited and reactivated bud connections between nucleolar DNA containing structures were displayed. The data are discussed in relation to the present knowledge of the functional architecture of the nucleolus.
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Abbreviations
- DNA:
-
deoxyribonucleic acid
- DNase:
-
deoxyribonuclease
- G0–1 :
-
phase G1 phase of the cell cycle indefinitely prolonged
- PEG:
-
polyethylene glycol
- RNA:
-
ribonucleic acid
- RNase:
-
ribonuclease
- S and G2 :
-
phases synthetic and postsynthetic phases of the cell cycle
- SPB:
-
saline phosphate buffer
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Nougarède, A., Landré, P. & Jennane, A. Intranucleolar visualization of nucleic acids and acidic proteins in inhibited and reactivated pea cotyledonary buds. Protoplasma 156, 183–191 (1990). https://doi.org/10.1007/BF01560656
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DOI: https://doi.org/10.1007/BF01560656