Plant Growth Regulator

Plant Growth Regulator is a systemic plant growth regulator that works by blocking the plant hormones that stimulate growth.



An Overview of Plant Growth Regulator

Plant growth regulators are a class of pesticides used to regulate plant growth and development, including synthetic hormone analogues with similar physiological and biological effects of natural plant hormones and natural plant hormones extracted from organisms. Its existence can affect and effectively regulate the growth and development of plants, including cell growth and division, to rooting, germination, flowering, fruiting, maturity and shedding.

Major types of Plant Growth Regulator

According to the different effects of plant growth regulators, they can be divided into plant growth promoters, plant growth retardants and plant growth inhibitors. Plant growth promoters can promote cell division, differentiation and elongation, or promote the growth of plant vegetative organs and the development of reproductive organs. Synthetic growth promoters can be classified into auxins, gibberellins, cytokinins, and brassinolides. Growth retardants are those synthetic organisms which have an inhibitory effect on the cell division of the sub-apical meristematic cells or primary meristematic cells of the stem end of the plant. It has no effect on the formation of leaves, flowers and fruits. Commonly used growth retardants are chlormequat, B9, mepiquat chloride, paclobutrazol, and the like. Plant growth inhibitors can inhibit the growth of apical meristem tissue, hinder the synthesis of nucleic acid and protein in cells, slow cell division, leading to loss of apical dominance, and great changes in plant morphology (such as increased number of lateral branches, smaller leaves). Commonly used plant growth inhibitors include abscisic acid (ABA), ethylene, triiodobenzoic acid (TIBA), torsokin, and malanyl hydrazide.

Plant Growth Regulator and diseases

Most plant growth regulators are low or weak toxicity. However, some plant growth regulators have significant chronic toxicity. For example, the chronic toxicity of 2,4-D is mainly manifested by toxicity to blood, liver and kidney, inhibition of certain enzyme activities and synthesis of certain proteins. A few plant growth regulators have the function of animal hormones. Many doctors with precocious puberty believe that children who eat foods containing plant growth regulators may cause precocious puberty.


Mao, L. L., zhen, L. Z., Zhao, X. H., Liu, S.D., Werf, W., Zhang, S. P., Spiertz, H., Li, Z. H. (2014) Crop growth, light utilization and yield of relay intercropped cotton as affected by plant density and a plant growth regulator. Field Crops Research. 155: 67-76.