This publication provides the meaning and definition of the term plant growth regulator addresses patterns of use for plant growth regulators and provides a . Plant growth regulators are the chemical substances that function by regulating the growth and development of plantsthey are also called as plant hormones. Plant growth regulators pgr s are molecules that influence the development of plants and are generally active at very low concentrations there are natural . Plants make plant growth regulators often called phytohormones to regulate growth development and responses to stimuli each of these small organic
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