Gibberellic acid (gibberellin A3) is a C19-gibberellin produced by higher plants and the rice pathogenic fungus Gibberella fujikori. The gibberellins have long been known as plant growth regulators. Gibberellins can stimulate rapid stem and root growth, induce mitotic division in the leaves of some plants, and increase seed germination rates. Gibberellic acid interacts with other plant hormones, including abscisic acid, auxin, ethylene, and cytokinin, throughout the plant life cycle.