| Collection: | Corinth | |
| Name: | Weaver & Williams, Botanical Gazette 111:4, 1950 | |
| Title: | Response of Flowers of Black Corinth and Fruit of Thompson Seedless Grapes to Applications of Plant Growth-Regulators | |
| Author: | Weaver, Robert J. & Williams, W. O. | |
| Series Title: | Botanical Gazette | |
| Volume: | 111:4 | |
| Month: | June | |
| Date: | 1950 | |
| Abstract: | 1. Oil emulsions of beta-naphthoxyacetic acid, alpha-naphthaleneacetic acid, gamma-(indole-3)-n-butyric acid, beta-naphthoxypropionic acid, 2,4,5-trichlorophenoxyacetic acid, 4-chlorophenoxyacetic acid, 2,4-dichlorophenoxyacetic acid, 2-chlorophenoxyacetic acid, alpha-(2-chlorophenoxy)propionic acid, and indole-3-acetic acid were separately applied to Black Corinth grapes by dipping clusters of the flowers at the beginning of or at full bloom. The first three compounds were also applied to Black Corinth in aqueous solution, Oil emulsions of the first six compounds listed were separately applied to Thompson Seedless grapes by dipping clusters of fruit at one of three developmental stages. 2. The treatment at full bloom of flower clusters of Black Corinth with beta-naphthoxypropionic acid at 200 p.p.m. resulted within 12 days in berries and clusters larger than those of untreated controls. The maturation of these treated clusters was accelerated. Applications of 4-chlorophenoxyacetic acid at 5 p.p.m. resulted in many large berries containing seeds or seedlike structures in contrast to berries of untreated controls or of other treatments which produced smaller seedless fruit. The other compounds resulted in no marked responses other than injury. 3. Very young berry clusters of Thompson Seedless grapes treated with concentrations of 20 p.p.m. of 4-chlorophenoxyacetic acid resulted in larger clusters and berries than untreated controls. The treated clusters were too compact for commercial use as table grapes. Clusters treated with concentrations of 200 p.p.m. of the compound showed little injury but developed pedicels more than twice as thick as the controls. The other compounds produced varying amounts of injury which, in some instances, resulted in the production of large berries, probably owing to the fewer number of normal berries per cluster in comparison with the untreated ones. 4. Young clusters were much more responsive than older ones. Some treatments resulted in only temporary curvatures of the rachis, its branches, and the pedicels; in more severe treatments the rachis and its branches enlarged, split, and callused, and many berries failed to enlarge; some clusters were killed. | |
| Page: | 477-485 | |
| JSTOR: | http://www.jstor.org/stable/2472851 |
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