Abscisic acid (ABA) acts as a plant hormone, not only regulates many important aspects of plant growth and development, including dormancy, senescence and fruit development, but also mediates some aspects of physiological responses to environmental stresses such as drought, cold and salt. After arrival at its site of action, the first step in ABA response is expected to be some kind of perception and recognition, ABA receptor plays a key role in the signal recognition. The use of ABA analogs in g...