University of California

Effect of gibberellin on seeded Vitis vinifera, and its translocation within the vine


Robert J. Weaver
Stanley B. McCune

Authors Affiliations

Robert J. Weaver was Lecturer in Viticulture and Viticulturist in the Experiment Station, Davis; Stanley B. McCune was Senior Laboratory Technician in the Department of Viticulture and Enology, Davis.

Publication Information

Hilgardia 28(20):625-645. DOI:10.3733/hilg.v28n20p625. August 1959.

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Four seeded grape varieties were treated, at various stages of development, with gibberellic acid as a water-soluble potassium salt (80 per cent active ingredient). The compound was applied by dipping, spraying, or painting, in amounts ranging from 1 to 100 ppm. The experiments were concerned with determining the proper concentration and time of application for producing loose clusters with a minimum of shot berries, and with translocation of gibberellin within the vine.

Dipping of Zinfandel clusters and spraying of entire vines at various prebloom, bloom, and postbloom stages gave varying results, including elongation and loosening of clusters; shot berries; accelerated flowering, fruit coloration, and ripening; a higher percentage of soluble solids; a decrease in rot; and some reduction of crop.

Carignane vines sprayed, at six stages of development, with gibberellin at 1 to 50 ppm, gave results similar to those for Zinfandel. There was loss of crop weight because of fewer berries in sprayed clusters.

In the translocation experiments, gibberellin was not translocated from one shoot to another, judging by its effect on shoot elongation. Red Malaga shoots about 3 feet long showed just as much additional growth when only the apical 6 inches were sprayed as when the whole shoot was sprayed. In 6-inch Carignane shoots, more gibberellin reached the apex when the basal leaf was treated than when an apical leaf was treated. An experiment in which foliage and/or clusters of Zinfandel were treated showed that much cluster elongation and shot berry development resulted from compound absorbed by the leaves.

Literature Cited

Weaver R. J. Preliminary report on thinning grapes with chemical sprays. Proc. Amer. Soc. Hort. Sci. 1954. 63:194-200.

Weaver R. J. Effect of gibberellic acid on fruit set and berry enlargement in seedless grapes. Nature. 1958a. 181:851-52. DOI: 10.1038/181851b0 [CrossRef]

Weaver R. J. Use of gibberellins in grape production. The Blue Anchor. 1958b. 35(4):26 27, 37-41.

Weaver R. J., Amerine M. A., Winkler A. J. Preliminary report on effect of level of crop on development of color in certain red wine grapes. Amer. Jour. Enol. 1957. 8:157-66.

Weaver R. J., Derose H. R. Absorption and translocation of 2,4-dichlorophenoxyacetic acid. Bot. Gaz. 1946. 107:509-21. DOI: 10.1086/335376 [CrossRef]

Weaver R. J., McCune S. B. Test for activity of plant regulators on grapes. Bot. Gaz. 1959a. 120(3):166-70. DOI: 10.1086/336020 [CrossRef]

Weaver R. J., McCune S. B. Response of certain varieties of Vitis vinifera to gibberellin. Hilgardia. 1959b. 28(13):297-350. DOI: 10.3733/hilg.v28n13p297 [CrossRef]

Weaver R. J., McCune S. B. Effects of gibberellin on seedless Vitis vinifera 1959c. (In press.)

Winkler A. J. Pruning and thinning experiments with grapes. California Exp. Sta. Bul. 1931. 519: http://archive.org/details/pruningthinninge519wink

Winkler A. J., Lamouria L. H., Abernathy G. H. Mechanical grape harvest—problems and harvest. Amer. Jour. Enol. 1957. 8:182-87.

Weaver R, McCune S. 1959. Effect of gibberellin on seeded Vitis vinifera, and its translocation within the vine. Hilgardia 28(20):625-645. DOI:10.3733/hilg.v28n20p625
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