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24 February - 2 March
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Introduction
Plant growth regulators (PGR) usually are defined as organic compounds, other than nutrients, that affect the physiological processes of growth and development in plants when applied in low concentration. Practically, plant growth regulators can be defined as either natural or synthetic compounds that are applied directly to a target plant to alter its life processes or its structure to improve quality, increase yields or to facilitate harvesting. The term plant hormone, when correctly used is restricted to naturally occurring plant substances. This fall into five classes: auxins, gibberellins, cytokinins, inhibitors and ethylene (gas). The term plant growth regulators include synthetic as well as naturally occurring hormones. Main functions Auxins: Cause enlargement of plant cell. Rooting and plant propagation Giberellins: Stimulate cell division, cell elongation or both. Cytokinins: Stimulate cell division in plants Inhibitors: Plant hormones that inhibit or retard a physiological or biochemical process in plants. |
Last modified: Wednesday, 19 September 2012, 7:39 AM