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Plant Physiology 51:464-467 (1973)
© 1973 American Society of Plant Biologists

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Kinetics of Stress Relaxation Properties of Oat Coleoptile Cell Wall after Geotropic Stimulation

J. Shen-Millera,1

Yoshio Masudab

a Division of Biological and Medical Research, Argonne National Laboratory, Argonne, Illinois 60439, Faculty of Science, Osaka City University, Osaka, Japan

This study describes the stress relaxation of the cell wall of oat (Avena sativa) coleoptiles after different periods of geotropic stimulation. The upper and lower tissues (with respect to gravity) of geotrophically stimulated coleoptiles exhibit different wall properties. The lower tissues are less resistant to deformation than the upper. The ratio of stress to strain is significatly less in the lower than in the upper tissue. Similarly, the relaxation time and the minimum relaxation time, derived from the Maxwell model which describes the physical characteristics of polymers, are also shorter in the lower tissue. However, the maximum relaxation time shows no difference between the upper and lower tissues of a geotropically stimulated coleoptile. The differences between the tissues begin at about 8 minutes after the commencement of stimulation, similar to the time for the initiation of dictyosome redistribution, and precede the onset of geotropism. The above responses of the cell wall of the lower tissue are similar to those induced by indoleacetic acid. The parameters of wall properties of the coleoptiles of both the control and the geostimulated fluctuate rhythmically with time. The periodic changes in wall properties of the coleoptile are compared to other cyclic physiological phenomena.

1 This work was supported by the United States Atomic Energy Commission and the United States National Aeronautics and Space Administration.




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H. Friedman, S. Meir, A. H. Halevy, and S. Philosoph-Hadas
Characterization of the asymmetric growth of gravistimulated snapdragon spikes by stem and cell dimension analyses
Am. J. Botany, June 1, 2003; 90(6): 849 - 856.
[Abstract] [Full Text] [PDF]


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Copyright © 1973 by the American Society of Plant Biologists