Phototropism, Adaptation, and the Light-Growth Response of Phycomyces

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Abstract
Phototropic bending can be initiated without the transient changes in growth speed that characterized a light-growth response. The conditions required are a change from a symmetric to an asymmetric illumination pattern while the cell receives a constant radiant flux. Phototropism is thus basically a steady state process. It cannot be founded on differential light-growth responses as in Blaauw''s theory. A possible model system for the unequal partition of growth during steady bending is discussed. The fact that light-growth responses show adaptation while phototropic bending does not follows from the different natures of the two responses.
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