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Hormones

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PLANT GROWTH REGULATION Terminology and Classification Terminology and Classification • Hormone • “Hormone” was first used to describe substances in animals “a substance produced in a gland that circulates in the blood and has an effect far away from the site of production” In plants “a chemical compound that acts at low concentrations to affect growth and development” Plant Hormone or Phytohormone • A natural substance (produced by plant) to control plant activities • Chemical messengers • produced in one part of a plant and transported to other parts at the site of the response • Stored in regions where stimulus occur and then released for transport through either phloem or mesophyll when the appropriate stimulus occurs Growth Regulators Plant growth regulators or Plant growth substances • include plant hormones (natural & synthetic), other than vitamins and microelements promote, inhibit or modify physiological processes • Natural: made by and stored in plants • Synthetic: applied to plant environment or genome Plant Hormone vs Animal Hormone • Plant Hormone • Animal Hormone • Small organic molecule • Also small organic molecule but of • Synthesized through the proteins/peptides in plant nature • Can be transported through • Synthesized in special vascular system glands • Wide targeting effects • Through circulatory system • Specialized effects Criteria or properties for Plant Hormones • The site of synthesis di ...
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