ISHS Acta Horticulturae 640: XXVI International Horticultural Congress: Viticulture - Living with Limitations
INDUCTION OF COMPACT CLUSTERS WITH LARGE SEEDLESS BERRIES IN THE GRAPE CULTIVAR 'FUJIMINORI' BY THE USE OF STREPTOMYCIN, GIBBERELLINS, AND CPPU |
| Authors: | F. Ikeda, K. Ishikawa, S. Yazawa, T. Baba |
| Keywords: | table grape, Fujiminori, tetraploid, seedlessness, streptomycin, GA, CPPU |
| DOI: | 10.17660/ActaHortic.2004.640.43 |
| Abstract:
The grape cultivar ‘Fujiminori’, a new tetraploid table grape in Japan was treated by streptomycin (SM), gibberellin (GA) and 1-(2-chloro-4-pyridyl)-3-phenylurea (CPPU) to promote seedlessness and enhance berry size. Manual berry thinning to produce compact clusters of 450 to 500 g instead of 2 to 4 kg was also tested. Dipping flower clusters with 200 ppm SM at 13 to 18 days prior to full bloom induced complete seedlessness, however the parthenocarpic fruit were smaller than seeded fruit. Spraying 2.5 ppm GA and thinning to 22 to 24 berries per cluster at full bloom increased weight of the seedless berries. The fruiting portion of the cluster was restricted to the top 3.5 to 4.0 cm section. At 10 to 12 days after full bloom, 25 or 50 ppm GA and 10 ppm CPPU were applied by dipping the clusters to further promote berry size. The result was a compact cluster, preferable for Japanese consumers, that had completely seedless, large berries (>20 g). Cluster quality was influenced little by the increased berry size induced by the treatments. | |
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