Journal
PLANT JOURNAL
Volume 50, Issue 3, Pages 429-438Publisher
BLACKWELL PUBLISHING
DOI: 10.1111/j.1365-313X.2007.03059.x
Keywords
phytochrome; auxin; signalling; shoot; root; Arabidopsis
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Funding
- Biotechnology and Biological Sciences Research Council [P19861/2] Funding Source: Medline
- Biotechnology and Biological Sciences Research Council [P19861/2] Funding Source: researchfish
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The phytochrome family of photoreceptors are potent regulators of plant development, affecting a broad range of responses throughout the plant life cycle, including hypocotyl elongation, leaf expansion and apical dominance. The plant hormone auxin has previously been linked to these phytochrome-mediated responses; however, these studies have not identified the molecular mechanisms that underpin such extensive phytochrome and auxin cross-talk. In this paper, we show that phytochrome regulates the emergence of lateral roots, at least partly by manipulating auxin distribution within the seedling. Thus, shoot-localized phytochrome is able to act over long distances, through manipulation of auxin, to regulate root development. This work reveals an important role for phytochrome as a coordinator of shoot and root development, and provides insights into how phytochrome is able to exert such a powerful effect on growth and development. This new link between phytochrome and auxin may go some way to explain the extensive overlap in responses mediated by these two developmental regulators.
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