Effect of plant hormones application methods on fruit quality of 'Superior Seedless' grape.

摘要

Seedless grapes enjoy great popularity among consumers, but their small size is a problem in their commercialization. This study was conducted during the period 2011-2013 in the Jordan Valley Vineyard in the Jordan. The experiment evaluated yield quality of 'Superior Seedless' grape after the application of Gibberellic acid (GA₃) and Naphthalene acetic acid (NAA). These growth regulators were applied during flowering by spraying the inflorescences or plunging them in whole at the following concentrations: 0 mg.L-1 GA₃ (control), 40 mg.L-1 GA₃ (treatment performed twice), 80 mg.L-1 GA₃, 40 mg.L-1 GA₃+0.2% NAA, and 0.2% NAA. Results showed that the applied treatments had a beneficial effect on cluster and berry weight as well as on the number of berries per cluster in the grape variety 'Superior Seedless'. GA₃ and the mixture of 40 mg.L-1 GA₃+0.2% NAA were shown to have a significant effect on cluster and berry length. The applied treatments slightly affected berry width in the grape variety under study. On the other hand an adverse effect on extract content of the 'Superior Seedless' fruit were found by the use of the plant hormones.