biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 44:355-360, 2001 | DOI: 10.1023/A:1012430408310

Effects of Benzylaminopurine and Abscisic Acid on Distribution of rRNA in the Palisade Cells of Excised Cucurbita Pepo Cotyledons

E.Z. Stoynova-Bakalova1, P.I. Petrov1, E.N. Karanov1
1 Institute of Plant Physiology "Acad. M. Popov", Bulgarian Academy of Sciences, Sofia, Bulgaria

rRNA was labelled with RNase-gold complexes applied to ultrathin Lowicryl sections of excised Cucurbita pepo L. (zucchini) cotyledons grown in darkness. Benzylaminopurine-caused stimulation of cotyledon growth decreases the density of ribosomes in palisade cells despite stimulating rRNA synthesis. Abscisic acid inhibits RNA synthesis and transport, but does not visibly affect the number of pre-existing ribosomes in retarded growth cells. The amount of rRNA in the cells of 24 h treated cotyledons is rather consequence of the growth rate than its leading factor.

Keywords: nucleolus; rRNA synthesis and transport; cell ultrastructure; ribosomes; morphometry; cell growth
Subjects: abscisic acid; cell ultrastructure, cotyledon rRNA distribution in palisade cells; cotyledon cell ultrastructure, rRNA distribution in palisade cells; Cucurbita pepo; cytokinins; palisade cells, rRNA distribution; ribosome, rRNA distribution in palisade cells, cotyledon; rRNA distribution in palisade cells, cotyledon; zuccini

Published: September 1, 2001  Show citation

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Stoynova-Bakalova, E.Z., Petrov, P.I., & Karanov, E.N. (2001). Effects of Benzylaminopurine and Abscisic Acid on Distribution of rRNA in the Palisade Cells of Excised Cucurbita Pepo Cotyledons. Biologia plantarum, 44(3), 355-360. doi: 10.1023/A:1012430408310
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