As a plant grows its physical traits, or phenotype, are the outcome of a complex interaction between its genetic instructions or genotype and the external environment. The growth and differentiation of cells in different parts of the plant are coordinated in response to these inputs.
Plant hormones are small organic compounds that influence physiological responses to environmental stimuli at very low concentration! (generally less that 10 power of -7)
Hormones are not directly involved in metabolic in developmental processes but there act at low concentrations to modify those processes.
Plant hormones are used extensively in agriculture,horticulture, and biotechnology to modify plant growth and development.
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