Fruit firmness is a highly valued characteristic among sweet cherry consumers, as it is associated with freshness.
Additionally, greater firmness leads to better shelf life and resistance to handling.
One of the most common strategies to enhance this trait is the use of gibberellic acid (GA), a phytohormone that influences the growth and development of plant tissues.
Figure 1. Colour expression of sweet cherry, cv. ‘Bing’ and ‘Lapins’, at 77 and 79 days after full bloom, respectively, for fruit treated with GA. T0: control and T60: GA at 30 ppm applied at pit-hardening and straw-colour stages.
A recent study analyzed the effects of gibberellic acid on the rheological properties of sweet cherries, particularly in “Bing” and “Lapins” cultivars, both at harvest and after 35 days of storage at 0°C, evaluating resistance to mechanical damage during handling and storage.
The study tested different application rates (15, 20, 25, 30 ppm) and timing.
The application of gibberellic acid resulted in a 2–4 days delay in fruit ripening compared to untreated cherries and led to a significant increase in fruit size and weight in “Lapins,” thereby enhancing yield, while no appreciable differences were observed in “Bing.”
The use of gibberellic acid also affected the mechanical characteristics of the sweet cherries: regardless of the applied concentration, it increased the modulus of elasticity and fruit resistance both at harvest and after storage.
This means that treated cherries were firmer and more resistant, a feature that can reduce the risk of bruising and damage during transport and sale.
The beneficial effects of gibberellic acid on fruit structure were maintained even after a long period of cold storage and three days of exposure to 15°C, simulating commercial conditions.
Figure 2A-B. Fruit size distribution at harvest for cv. ‘Bing’ and ‘Lapins’ sweet cherries depends on the rate of gibberellic acid (GA) application. Treatments: T0 (control), 0 ppm GA; T30, 15 + 15 ppm GA (pit-hardening + straw-colour); T45, 25 + 20 ppm GA (pit-hardening + straw-colour); T60, 30 + 30 ppm GA (pit-hardening + straw-colour). Different letters for each size show significantly different mean values for Fisher’s LSD test, with p-value < 0.05. NS: non-significant at p-value < 0.05.
Therefore, GA treatment increased resistance without increasing tissue deformability and even reduced it, making the fruit stiffer during storage under high humidity conditions.
However, this may make them more susceptible to epidermal fractures, which warrants further investigation, especially for cultivars naturally prone to "box-cracking" during storage.
The study also found that more mature sweet cherries (color 3.5) were less sensitive to mechanical damage than less mature fruit (color 3.0).
This effect is due to an increase in tissue deformation capacity, making the fruit more resistant to external pressure and reducing visible damage.
In conclusion, the results confirmed that gibberellic acid is an effective tool for improving the quality and firmness of sweet cherries, with positive effects that persist during and after storage.
However, its application must be carefully calibrated based on the variety and storage conditions to balance the benefits on fruit texture and the risk of possible side effects, such as excessive rigidity.
Optimizing the use of gibberellic acid can provide significant advantages for both producers and distributors, ensuring a high-quality product until consumption.
Source: Carrión-Antolí, A., Zoffoli, J. P., Serrano, M., Valero, D., & Naranjo, P. (2024). Preharvest Gibberellic Acid Treatment Increases Both Modulus of Elasticity and Resistance in Sweet Cherry Fruit (cv. ‘Bing’ and ‘Lapins’) at Harvest and Postharvest During Storage at 0° C. Agronomy, 14(11), 2738. https://doi.org/10.3390/agronomy14112738
Images: Carrión-Antolí et al., 2024
Andrea Giovannini
University of Bologna
04 Aug 2023
In the January-April period, the monitoring network of the E. Mach Foundation detected catches of Drosophila suzukii up to ten times higher than the average of the last decade. This explains the intensity of the attack recorded on the cherry crop since the last ten days of May.
18 Mar 2024
Raúl Orellana, Technical Manager for Quality, talks about his experience in China and how this prepares the company for the coming season, after part of his team experienced first-hand the journey that the cherries take to China.
22 May 2026
The CTIFL 2026 report presents guidelines to protect cherry trees in France from Drosophila suzukii, combining monitoring, netting, sanitation, biological control and authorized plant protection products for targeted, sustainable crop defense adapted to sites and varieties.
22 May 2026
Cherry orchard covers in Chile no longer protect only against rain: they now regulate microclimate, reduce cracking, improve export quality and fruit condition, supporting more stable economic returns in modern orchards exposed to growing climate risk and market pressure.
