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Genes Dev. 2012 Apr 15;26(8):785-90. doi: 10.1101/gad.187849.112.

Linking photoreceptor excitation to changes in plant architecture.

Author information

1
Plant Biology Laboratory, The Salk Institute for Biological Studies, La Jolla, CA 92037, USA.

Abstract

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.

PMID:
22508725
PMCID:
PMC3337452
DOI:
10.1101/gad.187849.112
[Indexed for MEDLINE]
Free PMC Article

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