One of the effects of Gibberellins is to induce the synthesis of amylase enzyme which causes the break down of starch and provides nourishment to the embryo in the seed. This phenomenon leads to the germination of seed. The hormone antagonist to this phenomenon is

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ABA acts as a general plant growth inhibitor and an inhibitor of plant metabolism. ABA inhibits seed germination. ABA stimulates the closure of stomata and increases the tolerance of plants to various kinds of stresses. Therefore, it is also called the stress hormone. ABA plays an important role in seed development, maturation and dormancy. By inducing dormancy, ABA helps seeds to withstand desiccation and other factors unfavourable for growth.