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Gibberellin Improves Blueberry Fruit Quality

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Blueberries, celebrated for their rich nutrients and unique flavor, have become a favorite among consumers. As cultivation scales expand, enhancing fruit quality through scientific methods has become a top concern for growers. Based on the research findings in Effects of Exogenous Gibberellin on Fruit Quality of Blueberry, this article explores how gibberellin (GA₃) can be applied in blueberry cultivation to achieve higher-quality yields.
Contents hide
1 What is Gibberellin and Why It Matters for Blueberry Cultivation?
2 What Is The Best Dosage of Gibberellin?
2.1 1. External Quality: 100mg/L GA₃ for More “Impressive” Fruits
2.2 2. Internal Quality: 50mg/L GA₃ for Nutrient Boost, 100mg/L GA₃ for Color Enhancement
3 50-100mg/L is the Golden Range

What is Gibberellin and Why It Matters for Blueberry Cultivation?

Gibberellin (GA₃) is a natural plant hormone widely used as a growth regulator in agriculture. Studies have shown that it effectively promotes fruit development, improves both external and internal fruit quality, and has become an important auxiliary tool in fruit tree cultivation.
 
In blueberry farming, the role of gibberellin is particularly prominent. Experiments by Huizhou University demonstrated that rational spraying of GA₃ can significantly enhance the fruit quality of the southern highbush blueberry variety L25. It not only makes the fruits larger and plumper but also increases nutrients like vitamin C and anthocyanins, boosting both the commercial and nutritional value of blueberries.

What Is The Best Dosage of Gibberellin?

1. External Quality: 100mg/L GA₃ for More “Impressive” Fruits

The size and shape of fruits are the first factors attracting consumers. Compared with the water-treated control (CK), the experimental data showed:

 

  • Single fruit weight: Blueberries treated with 100mg/L GA₃ had the largest single fruit weight, reaching 2.53g, which was 10.0% higher than CK.
  • Fruit transverse diameter: The transverse diameter of fruits treated with 100mg/L GA₃ was 18.29mm, an increase of 1.55% compared with CK.
  • Fruit longitudinal diameter: The 50mg/L GA₃ treatment had the best effect, with a longitudinal diameter of 13.18mm, 5.52% higher than CK.
  • Fruit shape index: The 50mg/L GA₃ treatment resulted in a rounder fruit shape with an index of 0.74, making the appearance better.

 

These data indicate that 100mg/L GA₃ can make blueberry fruits plumper and larger, while 50mg/L GA₃ can optimize the fruit shape, both improving the commercial appearance of blueberries.
 

2. Internal Quality: 50mg/L GA₃ for Nutrient Boost, 100mg/L GA₃ for Color Enhancement

The internal quality of blueberries depends on components such as soluble solids, sugar-acid ratio, vitamin C, and anthocyanins. Different concentrations of GA₃ have significantly different effects:

 

  • Soluble solids: All GA₃ treatments were basically the same as CK, not affecting the basic sweetness of the fruits.
  • Titratable acid: The 50mg/L GA₃ treatment increased by 15.1% compared with CK, and the appropriate increase in acidity can enrich the taste level.
  • Vitamin C: The 50mg/L GA₃ treatment had the highest content, reaching 168.40μg/g, a 66.3% surge compared with CK, greatly enhancing the antioxidant capacity of the fruits.
  • Anthocyanins: The 100mg/L GA₃ treatment had the best effect, increasing by 28.4% compared with CK, making blueberries brighter in color and higher in health value.
  • Soluble sugar: All GA₃ treatments decreased slightly, but combined with the increase in acidity, the overall flavor was more balanced.

50-100mg/L is the Golden Range

The experimental conclusion is clear: 50mg/L and 100mg/L GA₃ have the best effect on improving blueberry quality. Among them, 50mg/L focuses on increasing vitamin C and titratable acid content, while 100mg/L performs better in increasing fruit size and anthocyanin content. Growers can choose according to their planting goals. For comprehensive quality, it is recommended to alternate the two concentrations.

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