Abstract
A study of the revolutive movement and the growth of young plants cultivated under uniform conditions. Relationships between the commencement of revolutive movement and the stage of plant development are discussed. It is shown that the acquisition of the capacity for movement is related to a minimum growth rate of 12.5 mm/24 h, irrespective of light or temperature conditions. The capacity for movement is acquired when the plant possesses a fixed number of leaves; this number depends on the light intensity. The movement is dependent on a minimum leaf surface, which leads to the assumption that the biosynthesis of the photosynthetic apparatus is an influencing factor in the circumnutational mechanism.
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