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Phycomyces: fine structure analysis of the growing zone.

R I Gamow1, G A Geer, B Bottger

  • 1Department of Chemical Engineering, University of Colorado, Boulder, Colorado 80309.

Plant Physiology
|March 1, 1986
PubMed
Summary

This study analyzed the Phycomyces sporangiophore growing zone (GZ), confirming its non-uniformity. Elongation and rotation rates vary independently within the GZ, challenging previous models.

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Area of Science:

  • Mycology
  • Cell Biology
  • Biophysics

Background:

  • The growing zone (GZ) of Phycomyces sporangiophores is crucial for cell elongation.
  • Previous studies suggested a uniform GZ with counterclockwise rotation.

Purpose of the Study:

  • To perform a fine structure analysis of the Phycomyces sporangiophore GZ.
  • To investigate the uniformity and rotational dynamics within the GZ.
  • To evaluate the fibril reorientation model.

Main Methods:

  • Utilized a computer-video digitizer and recorder for high-resolution analysis.
  • Simultaneously tracked the trajectory of two independent particles within and above the GZ.
  • Measured rates of rotation and elongation as a function of position in the GZ.

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Main Results:

  • Confirmed that the GZ is not uniform, consistent with Cohen and Delbrück (1958).
  • Did not confirm the existence of counterclockwise rotation in mature sporangiophores.
  • Observed independent and non-linear changes in rotation and elongation rates within the GZ.

Conclusions:

  • The non-uniformity of the GZ is a key factor in Phycomyces growth.
  • The observed dynamics challenge previous assumptions about GZ structure and rotation.
  • Findings support the importance of the fibril reorientation model in explaining sporangiophore growth.