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- Title
Contrasting types of photoperiodic response in the control of dormancy.
- Authors
Vince-Prue, Daphne
- Abstract
The effect of night-break or day-extension treatments with red (R) and/or far-red (FR) light were examined in the control of dormancy and extension growth in <em>Weigela florida</em> and <em>Picea abies</em>. Dormancy in <em>Weigela</em> (as assessed by the continued production of new leaves) was completely prevented by a 30 min night-break treatment with R: the effect of R was prevented by a subsequent exposure to 30 min FR. A day-extension treatment for 8.25 h with R or with R+FR also completely prevented dormancy, irrespective of whether it was given before or after a short day (SD) in sunlight. There was no significant difference between any day-extension treatment, nor between day-extension treatments and a night-break with R. Dormancy in <em>Picea</em> (as assessed by the maintenance of shoot growth) was also delayed by a night-break with R but less effectively than the most effective day-extension. A day-extension treatment for 9h with R light was more effective when it preceded than when it followed a SD in sunlight. The addition of FR in the second but not in the first 9h of a 17 h photoperiod increased its effectiveness. It is concluded that the mechanisms of the control of dormancy must differ in the two species. A day-extension for 16 h with light from tungsten-filament lamps increased stem elongation in <em>Weigela</em> when compared with an R night-break. This resulted from an increase in internode length and there was no significant difference between the two treatments in their effect on leaf production.
- Subjects
NORWAY spruce; WEIGELA; WOODY plants; PHOTOPERIODISM; PLANTS; DORMANCY in plants; PHYSIOLOGICAL effects of light
- Publication
Plant, Cell & Environment, 1984, Vol 7, Issue 7, p507
- ISSN
0140-7791
- Publication type
Article
- DOI
10.1111/1365-3040.ep11616206