Journal
GENES & DEVELOPMENT
Volume 26, Issue 8, Pages 785-790Publisher
COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT
DOI: 10.1101/gad.187849.112
Keywords
auxin; phytochrome; shade avoidance
Categories
Funding
- NIH NRSA [F32-HG004830]
- National Science Foundation [0504645, MCB-0929402, MCB-1122246]
- Swedish Governmental Agency for Innovation Systems (VINNOVA)
- Swedish Research Council (Vetenskapsradet)
- NIH [R01GM52413, 5RC2GM092412-02, 5R01GM056006]
- Howard Hughes Medical Institute
- Direct For Education and Human Resources
- Division Of Graduate Education [0504645] Funding Source: National Science Foundation
- Div Of Molecular and Cellular Bioscience
- Direct For Biological Sciences [1122246] Funding Source: National Science Foundation
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Plants sense neighbor proximity as a decrease in the ratio of red to far-red light, which triggers a series of developmental responses. In Arabidopsis, phytochrome B (PHYB) is the major sensor of shade, but PHYB excitation has not been linked directly to a growth response. We show that the basic helix-loop-helix (bHLH) transcription factor PIF7 (phytochrome-interacting factor 7), an interactor of PHYB, accumulates in its dephosphorylated form in shade, allowing it to bind auxin biosynthetic genes and increase their expression. New auxin synthesized through a PIF7-regulated pathway is required for shade-induced growth, linking directly the perception of a light quality signal to a rapid growth response.
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