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Plant Physiology 91:685-689 (1989)
© 1989 American Society of Plant Biologists

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Environmental and Stress Physiology

Mutants of Arabidopsis thaliana with Decreased Amplitude in Their Phototropic Response 1

Jitendra P. Khurana2, Zhangling Ren3, Benjamin Steinitz4, Brian Parks5, Thérèse R. Best and Kenneth L. Poff

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

Two mutants of Arabidopsis thaliana have been identified with decreased phototropism to 450-nanometer light. Fluence-response relationships for these strains (ZR8 and ZR19) to single and multiple flashes of light show thresholds, curve shapes, and fluence for maximum curvature in `first positive' phototropism which are the same as those of the wild type. Similarly, there is no alteration from the wild type in the kinetics of curvature or in the optimum dark period separating sequential flashes in a multiple flash regimen. In addition, in both strains, gravitropism is decreased compared to the wild type by an amount which is comparable to the decrease in phototropism. Based on reciprocal backcrosses, it appears that the alteration is due to a recessive nuclear mutation. It is suggested that ZR8 and ZR19 represent alterations in some step analogous to an amplifier, downstream of the photoreceptor pigment, and common to both phototropism and gravitropism.

2 Permanent address: Department of Plant Molecular Biology, South Campus, University of Delhi, Dhaula Kuan, New Delhi-110021, India.

3 Present address: Department of Forest Research, 110 Green Hall, University of Minnesota, St. Paul, MN 55108.

4 Permanent address: Department of Ornamental Horticulture, Agricultural Research Organization, Volcani Center, Bet-Dagan 50-250, Israel.

5 Present address: Plant Gene Expression Center, 800 Buchanan Street, Albany, CA 94710.

1 Supported by the U.S. Department of Energy under contract No. DE-AC02-76ERO-1338, and the National Aeronautical and Space Administration under grant NAGW-882.






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