Natural plant growth inhibitors include abscisic acid, cinnamic acid, coumarin and salicylic acid.
Synthetic products include triiodobenzoic acid, maleic hydrazide, dichloroethyl trimethyl ammonium chloride (CCC) and so on.
Several common plant growth inhibitors
7 triiodobenzoic acid (2.3.5 triiodobenzoic acid)
TIBA is an anti-auxin regulator, which can hinder the transport of auxin and gibberellin in phloem. Its structure is similar to auxin, and it can compete with auxin for action sites, so that auxin can not bind to its receptor, so it is a competitive inhibitor of auxin.
Plasticine (9- hydroxyfluorene -(9)- carboxylic acid)
It can inhibit the division and elongation of apical meristem cells, inhibit the elongation of stems, promote the growth of axillary buds, and make plants develop into shrubs. Plasticine also has the characteristics that plants are not affected by gravity and light. Plasticine metabolizes quickly after entering the implant, so it should be used in time when smearing, and can enter the body through seeds, roots and leaves. There is gradient accumulation in activity centers such as bud and split cambium, and split tissue is the main site of action.
Chlorobenzene chloride 2- chloroethyl trimethyl ammonium chloride.
Contrary to gibberellin, it can shorten internodes, shorten plants, thicken stems and deepen leaves. Enhance the ability of crops to resist cold, drought and salinity. Inhibit cell elongation, inhibit stem and leaf growth, but do not affect reproduction. Promote plant dwarfing, stout stems and dark green leaves, and improve stress resistance and lodging resistance. Texing: low toxicity to people and livestock. In order to inhibit plant cell elongation, control overgrowth, dwarf plants, promote plant growth, develop roots and enhance lodging resistance.
Malehydrazide Malehydrazide (MH), also known as fresh green element,
MH is the first synthetic growth inhibitor. Because its structure is very similar to uracil, it can replace uracil in plants, but it can not play its physiological role in metabolism, thus preventing RNA synthesis, thus inhibiting cell division of apical meristem and destroying apical dominance. After entering the body, it is mainly concentrated in the energetic parts. MH is slightly corrosive to iron, with a half-life of 2-8 weeks in soil and rapid degradation in water. Insoluble in water, soluble in glacial acetic acid, and its sodium salt, potassium salt and ammonium salt are soluble in water. It is stable in acid and alkali.
PP333 (paclobutrazol), commonly known as paclobutrazol.
A new type of high-efficiency growth retardant, also known as paclobutrazol (MET) in China.
Its main physiological function is to hinder the biosynthesis of gibberellin and accelerate the decomposition of auxin in the body, thus delaying and inhibiting the vegetative growth of plants. Besides dwarfing culture for fruit trees, it has been widely used to prevent seedlings from growing white, and crops such as soybean, barley and wheat from dwarfing and lodging resistance. Low toxicity to people and livestock.
B9 Dimethylaminosuccinic acid (dimethylaminosuccinic acid)
Also known as Alar, B9 inhibits the synthesis of kaurene aldehyde, thus inhibiting the biosynthesis of GA. B9 can replace manual pruning to inhibit the growth of new shoots of fruit trees. In addition, B9 can also increase the yield of peanuts and soybeans. Inhibition of gibberellin biosynthesis. It can inhibit the cell division of meristem at the top of fruit trees, slow down the growth of branches and inhibit the germination of new shoots.
Bijiu (Damizide, Dimethyl Dihydrazide, Butyl Hydrazide)
Characteristics: low toxicity to people and animals. It is a plant growth inhibitor, which can inhibit the biosynthesis of endogenous gibberellin and endogenous auxin. Its main functions are to inhibit the growth of new branches, shorten internode length, increase leaf thickness and chlorophyll content, prevent flowering, promote fruit setting, induce adventitious root formation, stimulate root growth and improve cold resistance. Generally, it enters plants through stems and leaves and is guided to the action site with nutrient flow. It is a broad-spectrum plant growth regulator.
Pix (1- dimethylpyridine chloride) is also called growth hormone.
It is mainly used to control the excessive growth of cotton, shorten internodes, make leaves smaller, reduce the shedding of buds and bolls, and thus improve cotton yield. Spraying 25- 150ppm cotton leaves at bud stage, initial flowering stage and full flowering stage. Low toxicity to people and livestock. It can inhibit plant cell elongation, dwarf plants, shorten internodes, promote photosynthesis and increase yield.