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What is the primary role of gibberellic acid in agriculture?
Jul 25,2026
Gibberellic acid is a highly efficient, low-toxicity plant growth regulator. Its primary function is to regulate crop growth and development cycles by promoting cell elongation and division, thereby breaking dormancy, promoting bolting and flowering, improving fruit set, and increasing yields.
Main Functions and Effects:
- Breaking dormancy and promoting germination: Effectively breaks the dormancy of seeds, tubers (e.g., potatoes), and bulbs; substitutes for cold or light requirements to significantly increase germination rates and accelerate seedling emergence.
- Promoting stem and leaf elongation: Primarily acts on internode elongation, resulting in taller plants, thicker stems, and increased leaf area; particularly effective for dwarf varieties or crops with inhibited growth (e.g., celery, sugarcane).
- Inducing flowering and regulating flowering periods: Enables biennial plants requiring vernalization (e.g., Chinese cabbage, radish) to flower within the same year; in hybrid rice seed production, it is used to synchronize the flowering times of male and female parents, resolving issues of asynchronous flowering.
- Preserving flowers and fruit and inducing parthenocarpy: Reduces the shedding of buds, flowers, and fruit, thereby improving fruit set; can induce the formation of seedless fruit in certain crops (e.g., grapes, cucumbers), enhancing fruit quality.
Common Application Scenarios:
Grain crops: Regulating flowering times in hybrid rice seed production; soaking barley seeds to promote α-amylase formation and improve malt saccharification efficiency (for the brewing industry).
Cash crops: Spraying cotton during peak flowering to reduce bud and boll shedding; spraying sugarcane to promote stem elongation and increase sugar accumulation.
Fruit, vegetables, and horticulture: Preserving fruit and preventing drop in trees such as grapes and citrus; increasing yields for leafy vegetables like celery and lettuce; breaking dormancy and inducing sprouting in potatoes.
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