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Physical, Biochemical and Phytochemical Quality Variations in Grapes Treated by Exogenous Application of Gibberellic Acid

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Abstract

Gibberellic acid (GA3) application may help in attaining good bunch architecture of grapes. The current study was aimed to find the right stage and dose of GA3 to attain the desired level of compactness in grapes and its impact on fruit physical and biochemical quality. Exogenous application of GA3 was carried out on ‘Sultanina-C’, ‘Flame Seedless’ and ‘NARC Black’ cultivars of table grapes either at pre-bloom or full bloom stage at 5, 10, 20 and 30 ppm during first year experiment, while plain water was applied in control. The best treatments were repeated during the second year experiment. Medium loose bunches were obtained where 10 ppm GA3 was applied especially at the pre-bloom stage in all cultivars. Pre-bloom application of GA3 significantly increased the bunch length of ‘Sultanina-C’ and ‘Flame Seedless’. Variations in total soluble solids (TSS) were recorded during the years and cultivars, ranging from 14.4 to 20°Brix. Pre-bloom application of GA3 (10 ppm) significantly increased the TSS of ‘Sultanina-C’ and ‘Flame Seedless’ during both years, but ‘NARC Black’ showed a significant increase only in the first year. Vitamin C, total phenolic contents (TPC) and antioxidant scavenging activity (ASA) were decreased with the application of GA3. Primary antioxidant enzymes including superoxide dismutase (SOD) and catalase (CAT) were reduced in response to treatments, while peroxidase (POX) and polyphenol oxidase (PPO) followed a reverse trend. In conclusion, 10 ppm GA3 at the pre-bloom stage can help in obtaining medium loose bunches in ‘Sultanina-C’ and ‘Flame Seedless’ that trigger maturity by increasing TSS, but bioactive compounds and the level of primary antioxidant enzymes decreased.

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Acknowledgements

Mr. Uzman Khalil gratefully acknowledges the Higher Education Commission of Pakistan for providing financial support. The author also acknowledges postharvest students of batch 2017–2019 for assistance in experimental sampling and helping in laboratory analysis.

Funding

This work was supported by the Higher Education Commission of Pakistan under Indigenous PhD Fellowship 5000, Phase II, Batch V, and the project entitled ‘Various Supply Chain Issues and Commercial Potential of Some Minor Fruits’ (Grant No. 5933/Punjab/NRPU/R&D/HEC/2016).

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Contributions

Uzman Khalil: Data collection, formal analysis, and writing—original draft. Ishtiaq A. Rajwana: Research supervision, project administration, resources, and validation. Kashif Razzaq: Co-supervision, review and editing, formal analysis. Umar Farooq: Methodology, validation. Basharat A. Saleem: Visualization and validation.

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Correspondence to Uzman Khalil.

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Conflict of interest

U. Khalil, I. A. Rajwana, K. Razzaq, U. Farooq and B. A. Saleem declare that they have no competing interests.

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Data will be made available on reasonable request to the corresponding author.

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Khalil, U., Rajwana, I.A., Razzaq, K. et al. Physical, Biochemical and Phytochemical Quality Variations in Grapes Treated by Exogenous Application of Gibberellic Acid. Erwerbs-Obstbau 65, 2031–2044 (2023). https://doi.org/10.1007/s10341-023-00897-6

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  • DOI: https://doi.org/10.1007/s10341-023-00897-6

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