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• W2033484498 startingPage "1698" @default.
• W2033484498 abstract "The current consensus is that plant responses to canopy shade involve the perception of low red to far-red ratios (R:FRs) by phytochrome B (phyB), which leads to the direct activation of auxin synthesis genes by PHYTOCHROME INTERACTING FACTORs (PIFs). In addition to its effect on R:FRs, shade also reduces irradiance, but whether shade-induced drops in irradiance affect phyB activity has not been demonstrated. To address this issue, we investigated whether irradiance and R:FRs have similar effects on the nuclear distribution of phyB in petiole cells of light-grown plants. Under high-irradiance white light, phyB formed large nuclear bodies. Lowering irradiance without changing R:FRs or lowering R:FRs by adding far-red light led to the appearance of small nuclear bodies containing phyB. Large nuclear bodies remained but with some concomitant reduction in diameter. The appearance of small nuclear bodies was rapid, stable, and reversible upon the return to high irradiance and high R:FRs. High levels of red light but not of blue light were enough to restrain the formation of small phyB nuclear bodies. Irradiance was effective within the range found in natural canopies and even under relatively low R:FRs. The promotion of leaf hyponasty by lowering irradiance was impaired in phyB and pif mutants, as previously reported for the response to R:FRs. The expression of auxin-related genes showed a similar hierarchy of response to low R:FRs and low irradiance. We propose that phyB is able to perceive not only the low R:FRs, but also the low irradiance of shade." @default.
• W2033484498 created "2016-06-24" @default.
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• W2033484498 creator A5053498477 @default.
• W2033484498 date "2014-06-19" @default.
• W2033484498 modified "2023-10-18" @default.
• W2033484498 title "Phytochrome B Nuclear Bodies Respond to the Low Red to Far-Red Ratio and to the Reduced Irradiance of Canopy Shade in Arabidopsis" @default.
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• W2033484498 doi "https://doi.org/10.1104/pp.114.242438" @default.
• W2033484498 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4119049" @default.
• W2033484498 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24948827" @default.
• W2033484498 hasPublicationYear "2014" @default.
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