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- Title
Effects of Light and Gibberellic Acid on Internode Growth in Pisum sativum.
- Authors
Sale, P. J. M.; Vince, Daphne
- Abstract
The responses of internodes of tall and dwarf varieties of pea to irradiation and gibberellic acid have been studied. The inhibition of internode elongation by light was partly but not completely prevented by the application of large doses of gibberellic acid (GA). Although elongation following the application of GA was greater in the light than in the dark, internode lengths of plants in the light treatments plus GA were in all cases less then those of plants grown in the dark plus GA. Dwarf and tall varieties responded differently to wave-length of light. In dwarf varieties the shortest internodes occurred always in red light. In tall varieties, the relative effectiveness of red and blue light varied with the duration of irradiation: when daily irradiation periods of ¼-hour were given the shortest internodes occurred in red, but when longer periods were given, blue light became increasingly more effective than red in inhibiting internode elongation. When GA was applied, the different responses of tall and dwarf varieties to red and blue light were almost completely eliminated. Infra-red largely reversed the effect of a previous red light treatment, but had considerably less effect following a blue treatment. There was no interaction between GA and infra-red: both caused internode elongation, and they were almost completely additive in their effects.
- Subjects
PHYSIOLOGICAL effects of gibberellic acid; PEA varieties; PHYSIOLOGICAL effects of light; RADIATION; BLUE light; PLANT physiology
- Publication
Physiologia Plantarum, 1960, Vol 13, Issue 4, p664
- ISSN
0031-9317
- Publication type
Article
- DOI
10.1111/j.1399-3054.1960.tb08089.x