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PLANT PHYSIOLOGY , Vol 112, Issue 3 901-904, Copyright © 1996 by American Society of Plant Biologists
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DEVELOPMENT AND GROWTH REGULATION |
Cytokinin, Acting through Ethylene, Restores Gravitropism to Arabidopsis Seedlings Grown under Red Light
A. Golan, M. Tepper, E. Soudry, B. A. Horwitz and S. Gepstein
Department of Biology, Technion-Israel Institute of Technology, Haifa 32000, Israel
Cytokinin replaces light in several aspects of the photomorphogenesis of
dicot seedlings. Arabidopsis thaliana seedlings grown under red light have
been shown to become disoriented, losing the negative hypocotyl
gravitropism that has been observed in seedlings grown in darkness or white
light. We report here that cytokinin at micromolar concentrations restores
gravitropism to seedlings grown under red light. Cytokinin cancels the
effect of red light on the gravity-sensing system and at the same time
replaces light in the inhibition of hypocotyl elongation. Furthermore,
application of the ethylene precursor 1-aminocyclopropane-1-carboxylic acid
acts similarly to cytokinin. Cytokinin cannot restore gravitropism under
red light to an ethylene-insensitive mutant that is defective at the EIN2
locus. Stimulation of ethylene production, therefore, can explain the
action of cytokinin in restoring negative gravitropism to the hypocotyls of
Arabidopsis seedlings grown under continuous red light.
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