Foster, K. W. and Lipson, E. D. (1973) The Light Growth Response of Phycomyces. Journal of General Physiology, 62 (5). pp. 590-617. ISSN 0022-1295 http://resolver.caltech.edu/CaltechAUTHORS:FOSjgp73
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With the help of an automated tracking system we have studied the characteristics of the transient light growth response of Phycomyces. The response shows a sharply defined latency. The Q10 of the reciprocal latency is 2.4. Response patterns at different peaks of the action spectrum are the same. The gradual variation of response magnitude over a wide range of adapted intensifies parallels that of phototropism. The responses to saturating stimuli exhibit a strong oscillation with a constant period of 1.6 min and variable damping. The growth responses to sinusoidally varying light intensities show a system bandwidth of 2.5 x 10-3 Hz. The linear dependence of phase shift on frequency is largely attributable to the latency observed with pulse stimuli. In the high intensity range a previously suspected increase of the steady-state growth rate with intensity has been confirmed. The light growth responses of mutants selected for diminished phototropism have been investigated. Many of these mutants have sizable but grossly distorted growth responses.
|Additional Information:||Copyright © 1973 by The Rockefeller University Press. RUP grants the public the non-exclusive right to copy, distribute, or display the Work under a Creative Commons Attribution–Noncommercial–Share Alike 3.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/3.0/ and http://creativecommons.org/licenses/by-nc-sa/3.0/legalcode. Received on March 12, 1973. We are indebted to Professor Max Delbrück for helpful criticism, to Mrs. Jeanette Navest for preparation of cultures, and to Mr. Michael Walsh for technical assistance. Dr. Edward Lipson acknowledges support by a National Institutes of Health Postdoctoral Fellowship (1 F02 GM53785-01) from the National Institute of General Medical Sciences.|
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