*2.2.2.2 Gibberellic acid (GA3)*

Gibberellins are a group of tetracyclic diterpenoids endogenous regulators that are well-known for their capability to promote plant growth and development [44]. In the process of seed development, GA levels are usually high during the embryo

morphogenesis phase and decreased during the embryo maturation phase [45]. Active GAs may help promote the growth of embryo and later they are deactivated to avoid vivipary [46]. There are reports on the application of GA3 in alleviating innate and environment-induced dormancy [7, 47] or synchronizing GA with different scarification pre-treatments like stratification, heat and removal of seed coat [5, 48]. In fact, GA is likely to antagonize the ABA effect on seed development, particularly dormancy induction [49].
