It is important to understand that biostimulants do not act singly but rather act in conjunction with, or in opposition to, each other such that growth and development represents the net effect of biostimulant balance. Generally the hormonal biostimulants are thought to include five main classes: auxins, gibberellins, cytokinins, abscisic acid and ethylene. There are other chemicals found in plants, which influence plant growth that might appropriately be categorized as a hormonal biostimulant. At various times, one or another of these substances have been elevated to “official” plant hormone status, such as the brassinosteroids and the polyamines; however, only the five biostimulant types listed above have been universally granted this status.
Synthetic biostimulants may also include auxins, gibberellins, cytokinins of inhibitors that are man-made through the chemical process. A specific type of biostirnulant that inhibits certain plant activities are the “plant growth regulators”. The term plant growth regulator has been selected by the agricultural industry to denote synthetic materials and has been defined under, the Federal insecticide, Fungicide, and Rodenticide Act (FIFRA), administrated under the direction of the U.S E.P.A., as a compound that prevents, destroys, repels, or mitigates any pest, or is intended for use as a plant regulator, defoliant, or desiccant.
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