Gibberellic acid is a broad-spectrum plant growth regulator. There are 137 species of gibberellic acid discovered so far, but only a few species of gibberellins have biological activity. The most common ones used in production applications are GA3, GA4 and GA7. Gibberellic acid can promote the growth and development of crops after being absorbed through the leaves, branches, flowers, seeds and fruits of plants, making them mature earlier, increasing yields and improving quality. It can quickly break the dormancy of seeds, tubers, bulbs and other organs, promote germination, accelerate the growth of stems and leaves and the vines of some plants, preserve flowers and fruits, reduce the shedding of buds, flowers, bells and fruits, and improve the fruiting rate. and the formation of seedless fruits.
GA4+7 is more active in seed germination of tobacco, lettuce and other crops, and GA4+7 is more active than GA3 in the growth of dwarf peas.
GA3 mainly reduces the secretion of ethylene in crops and promotes stem growth, mainly because vegetative growth is greater than reproductive growth.
GA4+7 mainly promotes reproductive growth and flower differentiation. The main function of GA4 is to male flowers, promoting the number of male flower stamens. The main function of GA7 is to increase the proportion of female flowers on the vine. Usually GA4 and GA7 are used together, one for male flowers and one for female flowers, which is more conducive to pollination and fruiting.
