phototonus definition

  • noun:
    • their state to be sensitive to or irritated by light.
    • sensitiveness to, or discomfort due to light
    • A motile symptom in plants caused by exposure to light.
    • An irritable condition of protoplasm, causing action, because of a specific intensity of light.
    • In botany, a phrase suggested by Sachs the particular symptom in which the protoplasm can perform exhibiting frustration induced in a few plant-organs by contact with light of a certain strength.
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