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  Stem-piped light activates phytochrome B to trigger light responses in Arabidopsis thaliana roots

Lee, H.-J., Ha, J.-H., Kim, S.-G., Choi, H.-K., Kim, Z. H., Han, Y.-J., et al. (2016). Stem-piped light activates phytochrome B to trigger light responses in Arabidopsis thaliana roots. Science Signaling, 9(452): ra106. doi:10.1126/scisignal.aaf6530.

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Lee, H.-J., Author
Ha, J.-H., Author
Kim, Sang-Gyu1, Author              
Choi, H.-K., Author
Kim, Z. H., Author
Han, Y.-J., Author
Kim, J.-I., Author
Oh, Youngjoo1, 2, Author              
Fragoso, Variluska1, 2, Author              
Shin, K., Author
Hyeon, T., Author
Choi, H.-G., Author
Oh, K.-H., Author
Baldwin, Ian Thomas1, Author              
Park, C.-M., Author
Affiliations:
1Department of Molecular Ecology, Prof. I. T. Baldwin, MPI for Chemical Ecology, Max Planck Society, ou_24029              
2IMPRS on Ecological Interactions, MPI for Chemical Ecology, Max Planck Society, Jena, DE, ou_421900              

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 Abstract: The roles of photoreceptors and their associated signalingmechanisms have been extensively studied in plant photomorphogenesis with amajor focus on the photoresponses of the shoot system. Accumulating evidence indicates that light also influences root growth and development through the light-induced release of signaling molecules that travel from the shoot to the root.We explored whether aboveground light directly influences the root system of Arabidopsis thaliana. Light was efficiently conducted through the stems to the roots, where photoactivated phytochrome B (phyB) triggered expression of ELONGATED HYPOCOTYL 5 (HY5) and accumulation of HY5 protein, a transcription factor that promotes root growth in response to light. Stimulation of HY5 in response to illumination of only the shoot was reduced when root tissues carried a loss-of-functionmutation in PHYB, and HY5 mutant roots exhibited alterations in root growth and gravitropism in response to shoot illumination. These findings demonstrate that the underground roots directly sense stem-piped light to monitor the aboveground light environment during plant environmental adaptation.

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 Dates: 201620162016-11-01
 Publication Status: Published in print
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 Identifiers: Other: ITB532
DOI: 10.1126/scisignal.aaf6530
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Title: Science Signaling
Source Genre: Journal
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Publ. Info: American Association for the Advancement of Science
Pages: - Volume / Issue: 9 (452) Sequence Number: ra106 Start / End Page: - Identifier: ISSN: 1945-0877
CoNE: https://pure.mpg.de/cone/journals/resource/1945-0877