Chemical Coordination in Plants

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Plant growth regulators are also called plant hormones or phytohormones. They are organic substances produced in one part of the plant body and act in another part. They help control growth, developme…

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Phytohormones are mainly transported through phloem. This helps them move from the place where they are made to the place where they work.

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Growth promoters help in plant growth and development, while growth inhibitors reduce or slow growth at certain stages. Some growth promoters can act as inhibitors if present in excess.

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Auxins, gibberellins, and cytokinins are growth promoters. They support different aspects of plant growth such as elongation, cell division, and development.

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Ethylene and abscisic acid (ABA) are growth inhibitors. They slow down growth at certain stages and help in processes like fruit ripening, senescence, and stress response.

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Auxins were the first plant hormones to be discovered. They are important because they control major growth responses such as elongation, apical dominance, phototropism, and geotropism.

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Auxins are produced by the growing tips of the stem and root. These young growing regions are the main sites where auxin is formed.

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Indole Acetic Acid, or IAA, is the most abundant and powerful naturally occurring auxin. Most other auxins are derivatives of IAA, so it is the main natural auxin in plants.