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

Cited 75 time in Web of Science Cited 79 time in Scopus
Authors
Lee, Hyo-Jun; Ha, Jun-Ho; Kim, Sang-Gyu; Choi, Han-Kyu; Kim, Zee Hwan; Han, Yun-Jeong; Kim, Jeong-Il; Oh, Youngjoo; Fragoso, Variluska; Shin, Kwangsoo; Hyeon, Taeghwan; Choi, Hong-Gu; Oh, Kyung-Hwan; Baldwin, Ian T.; Park, Chung-Mo
Issue Date
2016-11
Citation
Science Signaling, Vol.9 No.452, p. ra106
Abstract
The roles of photoreceptors and their associated signaling mechanisms have been extensively studied in plant photomorphogenesis with a major 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-function mutation 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.
ISSN
1945-0877
URI
https://hdl.handle.net/10371/165976
DOI
https://doi.org/10.1126/scisignal.aaf6530
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College of Natural Sciences (자연과학대학)Dept. of Chemistry (화학부)Journal Papers (저널논문_화학부)
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