, Volume 145, Issue 2, pp 151–157 | Cite as

Synchronisation of cell division in the shoot apex of Silene in relation to flower initiation

  • Dennis Francis
  • Robert F. Lyndon


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.

Key words

Cell cycle DNA Flower initiation Shoot apex Silene 



long day(s)


short day(s)


DNA synthesis phase of cell cycle


pre-S interphase


post-S interphase




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Copyright information

© Springer-Verlag 1979

Authors and Affiliations

  • Dennis Francis
    • 1
  • Robert F. Lyndon
    • 1
  1. 1.Department of BotanyUniversity of EdinburghEdinburghU.K.

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