ABSTRACT
Plant growth regulators (PGRs) are organic compounds that in small amounts alter the growth of a plant or plant part. The term PGR includes naturally occurring plant growth substances, phytohormones, as well as synthetic compounds or chemical analogies. PGRs affect ¬owering, aging, root growth, distortion and killing of leaves, stems, and other parts, prevention or promotion of stem elongation, color enhancement of fruit, prevention of lea—ng and/or leaf fall, among others. They act as plant hormones would do; interacting with the plant’s physiological processes (Arteca 1996).
