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.
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.
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.
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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