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The Analysis of Spiral Growth in Phycomyces Using a Novel Optical Method ¹

^a Department of Aerospace Engineering Sciences, University of Colorado, Boulder, Colorado 80302

A conical mirror was designed and used to measure simultaneously the elongational and rotational displacement of a number of markers on the growing zone of the sporangiophore of Phycomyces. The results obtained by this new optical method demonstrate that the rotational rate is roughly proportional to the elongational rate, except in the lower region of the growing zone where a significant amount of rotation occurs without measurable elongation. From the data presented in this report, we have constructed a model that appears to explain the mechanism responsible for the left-handed spiral growth of the developing sporangiophore.

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				R. I. GAMOW and B. BOTTGER Phycomyces: Modification of Spiral Growth after Mechanical Conditioning of the Cell Wall Science, January 19, 1979; 203(4377): 268 - 270. [Abstract] [PDF]