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      Plant growth regulators are natural substances, their synthetic analogues and combined formulations, involved in regulation of the most important processes of plant development. Natural growth regulators are produced by plants themselves in small quantities. This class of substances includes cell growth and fission activators – gibberellins, auxins, cytokynins, brassinolides, as well as inhibitors of said processes – abscisic acid and ethylene. Synthetic analogues of natural regulators have the highest practical value. This group includes analogues of auxins and cytokynins, synthetic brassinolides, and substances showing retardant (growth-suppressing) activity - ethylene producers, antiauxins, and antigibberellins.
     In spite of excellent results obtained with the use of synthetic growth regulators, these products are greatly behind from pesticides in terms of consumption volumes in CIS countries. One of the main reasons is that the effect of growth regulators depends heavily on efficiency of other agrotechnical measures. Another problem of their use is a necessity of strict control of dosage, terms and application technologies. As a result of this, growth inhibitors, especially retardants and defoliants (substances causing abscission of leaves), became more widely applied. In 2008 Russia imported about 1,370 tonnes of synthetic plant growth regulators (mainly retardants). Export volume comprised about 340 tonnes of these products.

 

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