Plant growth regulators are organic synthesis, microanalysis, plant physiology and biochemistry, as well as modern agriculture and forestry horticultural cultivation and other scientific and technological development of the product. 20 to 20 years of the 20th century, found that there are trace of natural plant plant hormones such as ethylene, 3 - indole acetic acid and gibberellin, with the control of growth and development role. (DA-6), chlorpheniramine, sodium nitrophenolate, α-naphthylacetic acid, inhibiting buds and so on, and gradually developed in the 40s, began to study the artificial analogues.
Promote the use of the formation of a category of pesticides (see table). More than 30 years of artificial synthesis of plant growth regulators more and more, but because of the application of technology is more complex, its development as pesticides, fungicides, herbicides quickly, the application scale is also small. However, the needs of agricultural modernization point of view, plant growth regulators have great potential for development in the 80s has accelerated the development trend. China has been producing and applying plant growth regulators since the 1950s.
For the target plant, the plant growth regulator is an exogenous non-nutritive chemical that is usually transported to the site of action in the plant and can promote or inhibit certain aspects of its life process at very low concentrations, making it To meet the needs of human development. Each plant growth regulator has a specific use, and the application of technical requirements is very strict, only in the specific application conditions (including external factors) in order to produce a specific effect on the target plant.
Often changing the concentration will result in the opposite effect, for example promoting at low concentrations and inhibiting at high concentrations. Plant growth regulators have many uses, depending on the variety and the target plant. Such as: control budding and dormancy; promote rooting; promote cell elongation and division; control lateral buds or tillers; control plant type (dwarf strong lodging); control flowering or male and female sex, induced no fruit; ; Enhance the flavor and color; promote the latex or resin secretion; decolorization; Or to estimate (to facilitate mechanical harvest); preservation and so on. Some plant growth regulators are used as herbicides at high concentrations, and some herbicides have a growth regulator at low concentrations.