what are plant Harmon's ?
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Plant Hormones?
Plants need sunlight, water, oxygen, minerals for their growth and development. These are external factors. Apart from these, there are some intrinsic factors that regulate the growth and development of plants. These are called plant hormones or “Phytohormones”.
Plant hormones are chemical compounds present in very low concentration in plants. They are derivatives of indole (auxins), terpenes (Gibberellins), adenine (Cytokinins), carotenoids (Abscisic acid) and gases (Ethylene).
These hormones are produced in almost all parts of the plant and are transmitted to various parts of the plant.
They may act synergistically or individually. Roles of different hormones can be complementary or antagonistic.
Hormones play an important role in the processes like vernalisation, phototropism, seed germination, dormancy etc. along with extrinsic factors.
Synthetic plant hormones are exogenously applied for controlled crop production