Plant Growth Regulator

Gibberellic Acid function：

1. Stimulates Stem Elongation This is one of the most well-known effects of GA3. It promotes cell division and elongation, leading to longer and sometimes larger stems. This is particularly useful for: · Bolting in Long-Day Plants: Inducing flowering in plants that require long daylight hours. · Grape Rachis Elongation: Applying GA3 to grape clusters stretches the stem (rachis), allowing the berries more space to grow, which improves air circulation and reduces rot. 2. Breaks Seed and Bud Dormancy Many seeds and buds require specific environmental conditions (like cold temperatures) to break dormancy and germinate. GA3 can substitute for these requirements. · Seed Germination: It promotes the synthesis of enzymes like amylase in seeds, which breaks down stored food reserves, providing energy for the growing seedling. · Bud Break: In perennial plants and fruit trees like citrus, it can be used to break dormancy and ensure uniform bud sprouting. 3. Promotes Fruit Set and Development GA3 is crucial in the development of certain fruits, especially in the absence of pollination or fertilization (a process called parthenocarpy). · Seedless Fruits: It is extensively used in the production of seedless grapes, cucumbers, and tomatoes by stimulating the ovary to develop into a fruit without fertilization. · Improved Fruit Size: In grapes, it not only elongates the cluster but also increases the size of the individual berries. 4. Induces Flowering For some plants, the application of GA3 can influence the timing and process of flowering. · Biennial Plants: It can induce flowering in biennial plants (which normally flower in their second year) during their first year of growth. · Photoperiod-Sensitive Plants: It can substitute for the required day length in some plants to trigger blooming. 5. Sex Expression in Flowers In certain monoecious plants (having both male and female flowers on the same plant), GA3 can influence the sex of the flowers. · It generally promotes the formation of male flowers. This is useful in plant breeding programs for producing pollen. 6. Delays Senescence and Ripening By counteracting the effects of ethylene (the ripening hormone), GA3 can slow down the aging process in plants. · This helps in keeping fruits like citrus and bananas firmer and greener for a longer period, extending their shelf life.