What are the regulators?

Regulator is actually a type of pesticide, which, like pesticides and fungicides, is a classification of pesticides. Plant growth regulators are substances with plant hormone activity, which are synthesized by imitating the chemical structure of plant hormones (or extracted from microorganisms). It is widely used in agriculture, has a wide range of applications, and has the advantages of small dosage, high speed, high benefit and less residual poison. So what are the regulators?

Auxin (IAA)

Auxin is a kind of endogenous hormone containing an unsaturated aromatic ring and an acetic acid side chain. Indoleacetic acid (IAA), 4-chloro-IAA, 5-hydroxy-IAA, naphthylacetic acid (NAA), indolebutyric acid and other auxins are commonly used internationally. Therefore, it is customary to use indole acetic acid as a synonym for auxin.

Indoleacetic acid (IAA): indoleacetic acid (IAA) exists in plants and can be synthesized artificially. Visible light is easy to be oxidized, reduces its activity, and is easily decomposed by IAA oxidase in vivo.

Naphthylacetic acid and its homologues: the main functions are cutting rooting, thinning flowers and fruits, promoting flower bud formation, preventing pre-harvest fruit drop, and controlling the occurrence of sprouting branches.

Phenolic compounds: there are mainly 2meme4copyright Dentopropionic acid (2mem4-trichlorophenoxy propionic acid); 4Meconitrile CPA-PCPA, paraphrase; compound nitrophenol sodium. The main function is to promote rooting, inhibit new shoot growth, improve fruit setting and so on.

Gibberellins (GAs)

At present, there are more than 100 kinds of GA isomers, which are represented by GAs. The commonly used ones are GA3 (920) and GA4+7. The function is to break seed dormancy, promote seedling growth (dormant seedlings), inhibit flower bud formation, increase fruit setting rate, induce parthenocarpy, promote the increase of seedless grapes, and change fruit shape.

Cytokinin (CTK)

Cytokinin (CTK) is a kind of plant hormone that promotes cell division, bud formation and growth. ZT and BA,CPPU,TDZ are commonly used. When studying plant tissue culture in 1955, Skoog found a substance that promotes cell division, which is named kinetin.

Abscisic acid (ABA)

Abscisic acid is one of the natural plant growth regulators. The cost of abscisic acid produced by natural active abscisic acid (+)-ABA and traditional chemical synthesis is very high. The main physiological function of abscisic acid is to cause dormancy and promote shedding. The effect of abscisic acid is opposite to that of cytokinin. Abscisic acid can antagonize both gibberellin and cytokinin in plants.

Ethylene (ETH)

Ethylene is an endogenous hormone in plants. All parts of higher plants, such as leaves, stems, roots, flowers, fruits, tubers, seeds and seedlings, produce ethylene under certain conditions. It is transformed from methionine under the condition of sufficient oxygen supply. It is the lowest molecule in plant hormone, and its physiological function is to promote fruit and cell expansion. It can also induce flower bud differentiation, break dormancy, promote germination, inhibit flowering, organ shedding, dwarf plants and promote adventitious root formation.

Brassinolide (BR)

Also known as brassin and brassinolide, it can regulate all growth stages of crops, has the comprehensive effect of gibberellin, cytokinin and auxin, and has the function of balancing the development of these endogenous hormones in plants. The effect of brassinolide on promoting growth was very significant, and its concentration was several orders of magnitude lower than that of auxin.

VII. other types of plant growth regulators

2auxin regulators such as mae4murd, naphthylacetic acid, indoleacetic acid and indolebutyric acid can promote the adventitious root formation of cuttings in different degrees.

PGRs treatment of seeds such as gibberellins and cytokinins can induce and enhance the activity of hydrolases and accelerate seed germination.

Auxins, gibberellins, cytokinins and brassinolide can promote cell elongation.

The above is the introduction of regulators, farmers in the use of regulators, the dosage should be appropriate, can not be increased at will, can not be mixed at will, the use of appropriate methods, growth regulators can not replace the application of fertilizer.

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