Sensing the light environment in plants: photoreceptors and early signaling steps

Galvão, Vinícius Costa; Fankhauser, Christian

doi:10.1016/j.conb.2015.01.013

Cited by 367 publications

(276 citation statements)

References 59 publications

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“…Being sessile, plants have evolved complicated mechanisms to sense, respond, and adapt to varying light conditions (Xu et al, 2015). Although plant photoreceptors are well characterized (Galvão and Fankhauser, 2015), downstream signaling processes are less clear. In Arabidopsis, anthocyanin accumulation is light-regulated (Chalker-Scott, 1999; Maier et al, 2013) and the transcription factor MYB75 activates the expression of anthocyanin biosynthetic genes (Borevitz et al, 2000;Gonzalez et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

MYB75 Phosphorylation by MPK4 Is Required for Light-Induced Anthocyanin Accumulation in Arabidopsis

et al. 2016

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Light is a major environmental cue affecting various physiological and metabolic processes in plants. Although plant photoreceptors are well characterized, the mechanisms by which light regulates downstream responses are less clear. In Arabidopsis thaliana, the accumulation of photoprotective anthocyanin pigments is light dependent, and the R2R3 MYB transcription factor MYB75/PAP1 regulates anthocyanin accumulation. Here, we report that MYB75 interacts with and is phosphorylated by MAP KINASE4 (MPK4). Their interaction is dependent on MPK4 kinase activity and is required for full function of MYB75. MPK4 can be activated in response to light and is involved in the light-induced accumulation of anthocyanins. We show that MPK4 phosphorylation of MYB75 increases its stability and is essential for light-induced anthocyanin accumulation. Our findings reveal an important role for a MAPK pathway in light signal transduction.

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Section: Discussionmentioning

confidence: 99%

MYB75 Phosphorylation by MPK4 Is Required for Light-Induced Anthocyanin Accumulation in Arabidopsis

et al. 2016

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“…In the PHY box, "L" stands for protein levels in light and "D" for protein levels in the dark. Source data: for all, BAR eFP browser (http://bar.utoronto.ca/efp/cgi-bin/efpWeb.cgi), PHYs (Somers and Quail, 1995;Goosey et al, 1997;Tó th et al, 2001;Sharrock and Clack, 2002;Salisbury et al, 2007), PHOTs (Sakamoto and Briggs, 2002;Moni et al, 2015), CRYs (Tó th et al, 2001), and UVR8 (Rizzini et al, 2011). and pathogens (Ballaré et al, 2012;Galvão and Fankhauser, 2015). UV-B (280-315 nm) is perceived by UVR8, which uses a structure based on tryptophans and a complex salt bridge network.…”

Section: Uvr8mentioning

confidence: 99%

Light Signaling, Root Development, and Plasticity

2017

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“…In contrast to PIFs, the phytochrome family of photoreceptors (phyA-phyE in Arabidopsis) perceives R/FR/blue light signals in surrounding environment and promotes photomorphogenic development of plants (Rockwell et al, 2006;Bae and Choi, 2008;Quail, 2010;Galvão and Fankhauser, 2015). The phys are synthesized as the Pr form in the cytosol.…”

Section: Introductionmentioning

confidence: 99%

A Negative Feedback Loop between PHYTOCHROME INTERACTING FACTORs and HECATE Proteins Fine-Tunes Photomorphogenesis in Arabidopsis

Zhu

Xin

et al. 2016

Plant Cell

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The phytochrome interacting factors (PIFs), a small group of basic helix-loop-helix transcription factors, repress photomorphogenesis both in the dark and light. Light signals perceived by the phytochrome family of photoreceptors induce rapid degradation of PIFs to promote photomorphogenesis. Here, we show that HECATE (HEC) proteins, another small group of HLH proteins, antagonistically regulate PIFs to promote photomorphogenesis. HEC1 and HEC2 heterodimerize with PIF family members. PIF1, HEC1, and HEC2 genes are spatially and temporally coexpressed, and HEC2 is localized in the nucleus. hec1, hec2, and hec3 single mutants and the hec1 hec2 double mutant showed hyposensitivity to light-induced seed germination and accumulation of chlorophyll and carotenoids, hallmark processes oppositely regulated by PIF1. HEC2 inhibits PIF1 target gene expression by directly heterodimerizing with PIF1 and preventing DNA binding and transcriptional activation activity of PIF1. Conversely, PIFs directly activate the expression of HEC1 and HEC2 in the dark, and light reduces the expression of these HECs possibly by degrading PIFs. HEC2 is partially degraded in the dark through the ubiquitin/26S-proteasome pathway and is stabilized by light. HEC2 overexpression also reduces the light-induced degradation of PIF1. Taken together, these data suggest that PIFs and HECs constitute a negative feedback loop to fine-tune photomorphogenesis in Arabidopsis thaliana.

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Sensing the light environment in plants: photoreceptors and early signaling steps

Cited by 367 publications

References 59 publications

MYB75 Phosphorylation by MPK4 Is Required for Light-Induced Anthocyanin Accumulation in Arabidopsis

MYB75 Phosphorylation by MPK4 Is Required for Light-Induced Anthocyanin Accumulation in Arabidopsis

Light Signaling, Root Development, and Plasticity

A Negative Feedback Loop between PHYTOCHROME INTERACTING FACTORs and HECATE Proteins Fine-Tunes Photomorphogenesis in Arabidopsis

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