Phytochrome-mediated inhibition of shade avoidance involves degradation of growth-promoting bHLH transcription factors.

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PHYTOCHROME-INTERACTING FACTOR 4 (PIF4) regulates auxin biosynthesis at high temperature (2011, background): “Consistent with this idea, stem elongation during plant shade avoidance has been shown to involve both PIF4- and TAA1-mediated auxin biosynthesis (8, 19).”
Shade Avoidance (2012, positive): “PIL1 expression shows a strong and rapid promotion by low R:FR (Salter et al., 2003), which depends on PIF4 and PIF5 (Lorrain et al., 2008).”
The WRKY Transcription Factor Family in Model Plants and Crops (2017, background): “Similar to other eukaryotes, the ubiquitin-proteosome system (UPS) mediated degradation of TFs plays an important role in the regulation of gene expression (Jakoby et al., 2002; Allen et al., 2008).”
Regulatory Components of Shade Avoidance Syndrome (2010, background): “As indicated before, PIF4 and PIF5 accumulate to high levels in the dark, are selectively degraded in response to R light, and remain at high levels under simulated shade (low R:FR light) conditions (Lorrain et al., 2008).”
Coordination of Cryptochrome and Phytochrome Signals in the Regulation of Plant Light Responses (2017, background): “The involvement of both HFR1 and PIF4/5 in cry-mediated responses suggests that HFR1 also forms non-functional heterodimers with PIF4 and PIF5 downstream of crys.”