phototonus
  感光性
  Pho·tot·o·nus n.
  1. Bot. A motile condition in plants resulting from exposure to light. -- Pho*to*ton*ic a.
  2. Physiol. An irritable condition of protoplasm, resulting in movement, due to a certain intensity of light. -- Pho*to*ton*ic a.
  ◄ ►