Abstract
Rapidly growing shoot apices and flower clusters just past full bloom were treated with 40 ppm of gibberellic acid (GA) on Seeded Thompson and several seedless grape clones. Berries on some seedless selections were slightly stimulated to grow in comparison to the untreated control fruit while other hybrids responded to a large degree. These growth responses to GA were compared to the endogenous levels of free and bound gibberellins in the breaking buds, the elongating terminals beyond the treated zones, and maturing berries. No correlation was observed between the levels of these growth regulating substances and the responsiveness of the berries and shoots.
- Received April 1980.
- Revision received June 1980.
- Accepted June 1980.
- Published online January 1980
- Copyright 1980 by the American Society for Enology and Viticulture
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Vol 31 Issue 3
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