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Plant Physiology 58:127-130 (1976)
© 1976 American Society of Plant Biologists

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Articles

Limitation on the Use of the Horizontal Clinostat as a Gravity Compensator 1,2,3

Allan H. Brown, A. O. Dahl and D. K. Chapman

a Plant Centrifuge Laboratory, University City Science Center and Department of Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19174

If the horizontal clinostat effectively compensates for the influence of the gravity vector on the rotating plant, it should make the plant unresponsive to whatever chronic acceleration may be applied transverse to the axis of clinostat rotation. This was tested by centrifuging plants while they were growing on clinostats. For a number of morphological end-points of development the results depended on the magnitude of the applied g-force. Therefore, gravity compensation by the clinostat was incomplete. This conclusion is in agreement with results of satellite experiments which are reviewed.

1 This work was funded by National Aeronautics and Space Administration Grants NGR 39-010-104 and NGR 39-010-149 to the University of Pennsylvania and by Grant NGR 39-030-010 to the University City Science Center. It also was supported by NASA Contracts NAS 2-2432 and NAS 2-7730 to the University of Pennsylvania and by NASW-2208 and NASW-2232 to the University City Science Center.

2 Correspondence concerning this paper should be addressed to the authors, Department of Biology, G-5, University of Pennsylvania, Philadelphia, Pa. 19174.

3 This contribution has the designation NULTST-1, as a contractor's technical report to NASA.




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