Plant Growth Regulator

A plant growth regulator refers to a synthetic agent for promoting or inhibiting the physiological functions of plants such as germination, rooting, flower bud differentiation, flowering, fruiting, and defoliation. Higher green plants have a metabolite that promotes and inhibits the body, and is an indispensable substance in plant life activities. This organic substance synthesized by the plant itself is called auxin. In order to improve the yield and quality of crops, a series of chemical agents with auxin-like activity have been artificially synthesized to control plant growth and development and other life activities, called plant growth regulators. There are many kinds of plant growth regulators, and their action modes are different, and the mode of action of such compounds is still not very clear, and can only be classified according to their main physiological effects. Generally, it can be classified into a growth promoter, a growth retardant, a growth inhibitor, and a hormone type herbicide. 1 growth promoter. It has a growth regulator that promotes cell division, elongation and differentiation. Plant growth is an irreversible increase in volume and weight due to increased protoplasts, as well as differentiation and formation of new organs. The differentiation and formation of new organs is the result of cell division, elongation and differentiation. The auxin, gibberellin, and cytokinin in natural plant hormones, as well as artificially synthesized indolebutyric acid, 2-naphthylacetic acid, kinetin, and 6-benzyl adenine, all have growth promoting effects. 2 growth retardant. A growth regulator that delays the cell division, elongation, and growth rate of meristematic tissue (sub-top meristem) in the lower apical region of the plant. These substances can cause the plant to manifest a dwarf birth rationality without damaging the apical meristem, nor affecting the developmental process of the plant. Most of the effects of growth retardants are inhibition of gibberellin biosynthesis, such as chlormequat, butyryl hydrazide, Amo-1618, paclobutrazol, etc.; some promote the activity of peroxidase and indoleacetate oxidase. Enzymes can decompose auxin in plants, causing plant growth to be blocked, such as phosphine regulation. 3 growth inhibitors. Inhibits cell division and elongation of the apical meristem, destroys the apical dominance, thereby increasing the number of side branches and making the leaves smaller. Among these compounds are maleic hydrazide, triiodobenzoic acid, and torso. Some growth inhibitors also have the properties of a retarder, such as abscisic acid, diketal acid, and the like. 4 hormone-type herbicides. Some plant growth regulators can be used to regulate plant growth and development at low concentrations and can be used as herbicides at high concentrations to kill certain plants. This is because such growth regulators are not easily metabolized in plants. When they enter the plant in large quantities, they often disrupt the normal action of endogenous phytohormones in the plant, making growth and development impossible, and ultimately leading to plant death. . 2,4-D, 2,4,5-T, maleic hydrazide, 2,4-D propionic acid, 2,4,5-T propionic acid and the like which are hormone type herbicides. Plant growth and development, such as cell division, elongation, differentiation and organ formation, as well as flowering, fruiting, senescence and shedding, are regulated by plant growth regulators. Therefore, these substances have been widely used in the research and production of ornamental plants, artificially breaking bulbs and seed dormancy, promoting germination, controlling flowering, dwarf cultivation, cutting rooting, graft healing, prolonging cut flower life and in tissue culture and Both distant hybridization and other aspects have achieved good results.