Red Light and Ethylene Effects on Bean Hypocotyl Unhooking
FORT DETRICK FREDERICK MD
Pagination or Media Count:
Red light promotes the opening of the hypocotyl hook of Phaseolus vulgaris L. var. Black Valentine independently from its effect on decreasing ethylene production. This was shown by comparing red-light dose-response curves for hook opening and ethylene production. Also, for a given rate of ethylene production, achieved by treatment with indoleacetic acid, hooks treated with red light opened more than the controls. Ethylene induces hook closing, and this effect is enhanced by prior red-light treatment. Ethylene does not affect phytochrome transformation, but acts in some way to prevent subsequent growth of the inner hook cells. There is no effect of red light or ethylene on the lateral transport of indoleacetic acid in the hook region.
- Agronomy, Horticulture and Aquiculture
- Anatomy and Physiology