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Plant Physiology 61:199-203 (1978)
© 1978 American Society of Plant Biologists

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Growth and Epinasty of Marigold Plants Maintained from Emergence on Horizontal Clinostats 1

Theodore W. Tibbitts and William M. Hertzberg

Department of Horticulture, University of Wisconsin, Madison, Wisconsin 53706

Dry weight, leaf number, and leaf size of marigold plants (Tagetes patula) grown from emergence for 18 days on horizontal clinostats rotating at 15 revolutions per hour (rph), were similar to those of plants grown for the same period on vertically oriented clinostats rotating at 15 rph. The horizontally grown plants exhibited some epinasty which disappeared when plants were placed upright for 24 hours. Vertically grown plants when placed on horizontal clinostats for 24 hours exhibited more epinasty than plants grown from emergence on horizontal clinostats.

Data are provided to demonstrate that leaves undergo movement (bending) during each rotation cycle that leads to the development of a leaf curvature that is oriented away from the direction of rotation. The results of this study suggest that epinasty of plants placed on horizontal clinostats could be due to uncontrolled movement of plants during rotation rather than controlled by gravity nullification. The usefulness of horizontal clinostats for gravity nullification or simulating weightlessness on plants is questioned.

1 The research was supported by the College of Agricultural and Life Sciences, University of Wisconsin-Madison and by the National Aeronautics and Space Administration under Contract NAS 2-7314.




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R. M. WHEELER and F. B. SALISBURY
Gravitropism in Plant Stems May Require Ethylene
Science, September 5, 1980; 209(4461): 1126 - 1128.
[Abstract] [PDF]


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Copyright © 1978 by the American Society of Plant Biologists