Synchronisation of cell division in the shoot apex of Silene in relation to flower initiation |
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Authors: | Dennis Francis Robert F Lyndon |
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Institution: | (1) Department of Botany, University of Edinburgh, Mayfield Road, EH9 3JH Edinburgh, U.K.;(2) Present address: Department of Plant Science, University College, P.O. Box 78, CF1 1XL Cardiff, U.K. |
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Abstract: | In plants of Silene coeli-rosa, induced to flower by 7 LD, synchronisation of cell division in 20 per cent or more of the cells in the shoot apical dome was found on the 8th and 9th days after the beginning of induction, during the plastochron before sepal initiation. Synchronisation was inferred from the changes in the proportions of cells with the 2C and 4C amounts of DNA, and changes in mitotic index and labelling index. From the peaks of mitotic index a cell cycle of 10 h was measured for the synchronised cells, half that of cells in the apices of uninduced plants in short days. The faster cell cycle and synchronisation in the induced plants was associated with a shortening, of both G1 and G2, suggesting two control points, while S and M remained unchanged. These results are compared with those from other plants in which synchronisation occurs at the beginning rather than the end of evocation.Abbreviations LD
long day(s)
- SD
short day(s)
- S
DNA synthesis phase of cell cycle
- G1
pre-S interphase
- G2
post-S interphase
- M
mitosis |
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Keywords: | Cell cycle DNA Flower initiation Shoot apex Silene |
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