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Plant Growth Regulators play a vital role in determining the growth and developmental pathway of plant cells. Naturally, it is synthesized in plants and control the growth and development, including seed germination, organ formation, flowering, tissue differentiation, stress tolerance, pathogen defense, etc. Plant hormones are classified into five groups viz auxin, cytokinins, gibberellins, ethylene, and abscisic acid based on their chemical structure and physiological function. Each class of hormone has a unique role in the morphogenesis of plant organs. Hence, it is widely utilized in tissue culture mediated in vitro propagation of plants. 

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Plant Growth Regulators A vital component of plant growth medium in plant tissue culture.pdf