Indole-3-butyric acid, an alternative to GA3 for bunch quality enhancing of table grape Vitis vinifera L. cv. Superior Seedless

Gibberellic acid (GA3) is the most widely used plant growth regulator to thin out bunches and increase berry size in seedless table grapes, but there evidence of its negative effects, including loss fertility malformations rachis. This study analyses effects applying auxin indole-3-butyric (IBA), as a novel alternative, on fruit yield, bunch structure, anatomy postharvest quality cv. Superior Seedless. The application IBA GA3 at different phenological stages (15 cm shoot length, full bloom, set pea-size berry) doses (2, 20 50 ppm) were compared two-growing season experiment. Spraying bloom or set, improved weight by increasing berries, correlating with promotion rachis vascular tissues. Bunches treated retained greater number berries harvest without generating compactness, since elongation internodes lateral shoulders also promoted. In addition, augmented reducing browning firmness. These results suggest that use beneficial technology improve structure grapes. Highlights applied dosages was evaluated. size. per increased set. internode length via quality, reduced