Abstract
Shade avoidance responses are changes in plant architecture to reduce the part of a body that is in the shade in natural habitats. The most common warning signal that induces shade avoidance responses is reduction of red/far-red light ratio perceived by phytochromes. A pair of basic helix-loop-helix transcription factors, named PHYTOCHROME-INTERACTING FACTOR 4 (PIF4) and PIF5, is crucially involved in the shade avoidance-induced hypocotyl elongation in Arabidopsis thaliana. It has been recently reported that PIF7 also plays a role in this event. Here, we examined the involvement of these PIFs in end-of-day far-red light (EODFR) responses under light and dark cycle conditions. It was shown that PIF7 played a predominant role in the EODFR-dependent hypocotyl elongation. We propose the mechanism by which PIF7 together with PIF4 and PIF5 coordinately transcribes a set of downstream genes to promote elongation of hypocotyls in response to the EODFR treatment.
Highlights
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We propose the mechanism by which PIF7 together with PHYTOCHROME-INTERACTING FACTOR 4 (PIF4) and PIF5 coordinately transcribes a set of downstream genes to promote elongation of hypocotyls in response to the end-of-day far-red light (EODFR) treatment
It is well known that phyB signaling is mediated by PHYTOCHROME-INTERACTING FACTOR (PIF) family to regulate germination, skotomorphogenesis, and chlorophyll synthesis.7,8) In particular, a pair of closely related homologs PIF4 and PIF5 is involved in shade avoidance-induced hypocotyl elongation.9–11) They are responsible for the short day-induced and/or warm night-induced hypocotyl elongation.12–16) PIF4 and PIF5 belong to a subfamily of basic helix–loop–helix transcription factors that interact with the active form of phyB in the nucleus.7,17,18) Upon the binding to phyB, PIF4, and PIF5 are rapidly phosphorylated and degraded in the proteasome in the daytime
Summary
View supplementary material Submit your article to this journal View related articles Citing articles: 10 View citing articles. We examined the involvement of these PIFs in end-of-day far-red light (EODFR) responses under light and dark cycle conditions. We propose the mechanism by which PIF7 together with PIF4 and PIF5 coordinately transcribes a set of downstream genes to promote elongation of hypocotyls in response to the EODFR treatment.
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