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Annals of Botany 28: 163-167, 1964
© 1964 Annals of Botany Company

RESEARCH-ARTICLE

The Effect of Flower Induction on the Rate of Leaf Initiation

R. H. M. LANGER and W. T. BUSSELL*

Lincoln College Canterbury, New Zealand

Vegetative plants of four short-day and five long-day species were exposed to inductive or non-inductive daylengths continuously, or to inductive conditions for just long enough to induce flowering. One day-neutral species was given long days throughout the experiment. The rate of leaf initiation was significantly greater in flowering than in vegetative shoots in all photoperiodically sensitive species following induction until the formation of a terminal flower. A significant increase in the rate of leaf initiation was also noted when floral initials began to appear in the day-neutral species. It is concluded that floral induction and stimulation of leaf initiation are likely to be universally associated whether species are photoperiodically sensitive or not. It is also suggested that, together with apical elongation and early development of axillary buds, this stimulation is an essential step in the morphological sequence by which flower initials are produced.


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