Hormones213-page2 - hormones identified in plants most...

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Plant Growth Regulators - 2 Plant Growth Regulators Plant hormones, or plant growth regulators, are chemicals produced by plants that alter growth patterns and/or maintenance of the plant. They can be found in many cells and tissues, although plant hormones seem to be concentrated in meristems and buds (which are dormant shoot meristems). Growth regulators control cell activities by sending chemical signals or messages to cells to do something or to not do something, including activating the genes that code for specific enzymes or blocking gene transcription. Plant hormones inhibit as well as promote cellular activities. In contrast to animal hormones, which generally have very specific effects, the
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Unformatted text preview: hormones identified in plants most often regulate division, elongation and differentiation of cells. Most hormones have multiple effects in plants. Plant hormones, as do animal hormones, work in very small concentrations. In most cases, the effect plant hormones have on the plant depends on the location of and concentration of the hormone relative to other hormones in the specific tissues. Plant hormones often work in conjunction with each other, and have overlapping effects. They also work with environmental stimuli, as we shall discuss. There are several classes of plant hormones, including a number of recently “discovered” ones. We will look at each of these briefly....
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