Red-light-induced positive phototropism in Arabidopsis roots

The interaction between light and gravity is critical in determining the final form of a plant. For example, the competing activities of gravitropism and phototropism can determine the final orientation of a stem or root. The results reported here indicate that, in addition to the previously describ...

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Bibliographic Details
Published in:Planta 2001-02, Vol.212 (3), p.424-430
Main Authors: Ruppel, Nicholas J., Hangarter, Roger P., Kiss, John Z.
Format: Article
Language:English
Subjects:
Arabidopsis - genetics
Arabidopsis - physiology
Arabidopsis - radiation effects
Biological and medical sciences
Curvature
Fluence
Fundamental and applied biological sciences. Psychology
Gravitropism
Gravitropism - physiology
Hypocotyls
Life Sciences (General)
Light
Movements
Phototropism
Phototropism - physiology
Plant cells
Plant physiology and development
Plant roots
Plant Roots - physiology
Plant Roots - radiation effects
Plants
Root growth
Seedlings
Space life sciences
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Summary:The interaction between light and gravity is critical in determining the final form of a plant. For example, the competing activities of gravitropism and phototropism can determine the final orientation of a stem or root. The results reported here indicate that, in addition to the previously described blue-light-dependent negative phototropic response in roots, roots of Arabidopsis thaliana (L.) Heynh. display a previously unknown red-light-dependent positive phototropic response. Both phototropic responses in roots are considerably weaker than the graviresponse, which often masks phototropic curvature. However, through the use of mutant strains with impaired gravitropism, we were able to identify a red-light-dependent positive phototropic response in Arabidopsis roots. The redinduced positive phototropic response is considerably weaker than the blue-light response and is barely detectable in plants with a normal gravitropic response.
ISSN:0032-0935
1432-2048
DOI:10.1007/s004250000410