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Plant Physiology 97:1470-1475 (1991)
© 1991 American Society of Plant Biologists

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Environmental and Stress Physiology

Kinetics for Phototropic Curvature by Etiolated Seedlings of Arabidopsis thaliana 1

Vladimir Orbovic and Kenneth L. Poff

Michigan State University-Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824

An infrared-imaging system has been used to study the influence of gravity on the kinetics of first positive phototropism. The development of phototropic curvature of etiolated seedlings of Arabidopsis thaliana was measured in the absence of visible radiation. Following a pulse of blue light, stationary seedlings curved to a maximum of approximately 16° about 80 minutes after stimulation. The seedlings then curved upward again or straightened by about 6° during the subsequent 100 minutes. Seedlings rotated on a clinostat reached a similar maximum curvature following photostimulation. These seedlings maintained that curvature for 30 to 40 minutes before subsequently straightening to the same extent as the stationary seedlings. It is concluded that straightening is not a consequence of gravitropism, although gravity has some effect on the phototropism kinetics.

1 Supported by the U.S. Department of Energy under contract No. DE-ACO2-76ERO-1338 and the U.S. National Aeronautical and Space Administration under grant NAGW-882 to K.L.P.




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E. L. Stowe-Evans, R. M. Harper, A. V. Motchoulski, and E. Liscum
NPH4, a Conditional Modulator of Auxin-Dependent Differential Growth Responses in Arabidopsis
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Copyright © 1991 by the American Society of Plant Biologists