Summary
Using cytophotometric procedures, we measured the nuclear and nucleolar protein content of successive zones of growth and differentiation in consecutive (1–7 mm) root segments obtained from eight species of the Angiospermae after staining the preparations with Feulgen-Naphthol Yellow S (F-NYS). In meristematic cells the nuclear and nucleolar protein content was found to double during the cell cycle. In species in which differentiation occurs at the same time as nuclear DNA endoreplication, i.e. Vicia faba subsp. minor, V. faba subsp. major, Pisum sativum, Hordeum vulgare and Amaryllis belladonna, the pool of nuclear proteins observed during the G2 phase of the cell cycle was seen in the differentiated zone in nuclei containing 8C DNA. Species in which differentiation is not accompanied by the process of nuclear DNA endoreplication, i.e. Levisticum officinale, Tulipa kaufmanniana and Haemanthus katharinae, exhibited the highest nuclear proteins content during the G2 phase of the cell cycle; comparably high values were not found in the differentiated zone. A decrease in nucleolar protein content was observed during the process of differentiation, this tendency being more evident in the studied species that do not exhibit endoreplication.
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This work was supported by the Polish Academy of Sciences as a part of project no 09.7.1.4.5
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Marciniak, K., Bilecka, A. Changes in nuclear and nucleolar protein content during the growth and differentiation of root parenchyma cells in plant species with different DNA-endoreplication dynamics. Histochemistry 85, 51–56 (1986). https://doi.org/10.1007/BF00508653
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DOI: https://doi.org/10.1007/BF00508653