Cell cycling and the fate of potato buds
1987
Clowes, F.A.L. | MacDonald, M.M.
The cell cycling characteristics of the regions of the apical meristems of underground shoots and buds of Solanum tuberosum L. were investigated by stathmokinesis and labelling. The apical domes of orthotropic shoots produce cells at twice the elemental rate of those of stolons, and their youngest leaf primordia at twelve times the rate. Changing the fate of stolons so that they will become orthotropic by decapitating the tuber sprouts that bear them results within 24 h in a general increase in cell production especially in the leaf primordia. Axillary buds on tuber sprouts induced to become precursors of orthotropic shoots instead of stolons undergo a spectacular increase in cell division within 24 h in all regions, especially in the primordia and bud anlagen where the rate increases 20-fold or more. The summit is slower to react than other regions, but, by 24 h, its rate of cell division increases 11-fold and it is contributing 14 cells per day to the flanks from its 80 cells. In all the axillary buds the rate of mitosis in the summit is half that of the flanks of the apical dome, but, in both stolons and orthotropic underground shoots, the rate is higher in the summit than in the flanks or rib meristem. The results are discussed in relation to what is known of cell cycling changes after floral evocation.
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