The Journal of General Physiology
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The Journal of General Physiology, Vol 45, 39-46, Copyright © 1961 by The Rockefeller University Press

ARTICLE

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

Edward S. Castle 1

1 From the Biological Laboratories, Harvard University, Cambridge

Phototropic bending can be initiated without the transient changes in growth speed that characterize 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.

Submitted on March 27, 1961


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E. S. Castle
Light Responses of Phycomyces
Science, December 16, 1966; 154(3755): 1416 - 1420.
[Abstract] [PDF]


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