Red-light-induced positive phototropism in Arabidopsis roots

@article{Ruppel2001RedlightinducedPP,
  title={Red-light-induced positive phototropism in Arabidopsis roots},
  author={Nicholas J. Ruppel and Roger P. Hangarter and John Z. Kiss},
  journal={Planta},
  year={2001},
  volume={212},
  pages={424-430}
}
Abstract. 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… 
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Roots of Nicotiana sylvestris Lack Phototropism
TLDR
Results with orientation and time course studies and experiments with a high‐resolution computer‐based feedback system demonstrate that roots of N. sylvestris seedlings are not phototropic in the presence of white or blue light, and examined root phototropism in Nicotiana syl vestris, which also has been a model system in studies of physiology and development.
Phototropism and gravitropism in lateral roots of Arabidopsis.
TLDR
This study reports on tropistic responses in lateral roots of Arabidopsis thaliana, the first report of phototropism of lateral roots in any plant species.
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