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eyespot
eyespot
1. In certain unicellular algae, an organelle consisting of closely packed lipid globules (usually or always containing orange or red carotenoids); it is generally believed to be involved in phototaxis. 2. A disease of cereals caused by the fungus Pseudocercosporella herpotrichoides. Initially a dark smudge appears on the outer leaf-sheath, then an oval ‘eye-shaped’ lesion develops near the base of the plant, weakening the stem and leading to increasing susceptibility to lodging (i.e. being laid flat by weather). A similar disease, called sharp eyespot, is caused by Rhizoctonia solari. |
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Cite this article
MICHAEL ALLABY. "eyespot." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. 12 Feb. 2012 <http://www.encyclopedia.com>. MICHAEL ALLABY. "eyespot." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. (February 12, 2012). http://www.encyclopedia.com/doc/1O7-eyespot.html MICHAEL ALLABY. "eyespot." A Dictionary of Plant Sciences. 1998. Retrieved February 12, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O7-eyespot.html |
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eyespot
eyespot (stigma)
1. A structure found in some free-swimming unicellular algae and in plant reproductive cells that contains orange or red pigments (carotenoids) and is sensitive to light. It enables the cell to move in relation to a light source (see phototaxis). 2. A spot of pigment found in some lower animals, e.g. jellyfish. 3. An eyelike marking on the wings of certain insects, which is revealed in startle displays. |
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Cite this article
"eyespot." A Dictionary of Biology. 2004. Encyclopedia.com. 12 Feb. 2012 <http://www.encyclopedia.com>. "eyespot." A Dictionary of Biology. 2004. Encyclopedia.com. (February 12, 2012). http://www.encyclopedia.com/doc/1O6-eyespot.html "eyespot." A Dictionary of Biology. 2004. Retrieved February 12, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O6-eyespot.html |
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