ArticleThe Plant journal : for cell and molecular biology2023
ELONGATED HYPOCOTYL5 (HY5) and HY5 HOMOLOGUE (HYH) maintain shade avoidance suppression in UV-B.
Article in The Plant journal : for cell and molecular biology, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers, 1 of them a synthesis that pooled it.
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Who cites it
9 citing papers in PubMed, 1 synthesis or guideline pooled it, 21 citations in OpenAlex.
- Identification of Key Differentially Expressed Genes inInternational journal of molecular sciences · 2025Pooled it
- Prefoldin 3 promotes the turnover of WRKY70 and FHY3 to modulate UV-B-induced hypocotyl growth inhibition in Arabidopsis thaliana.Plant communications · 2026Article
- Integration of light quality signals regulates ABA abundance and stomatal movements during seedling establishment.The New phytologist · 2026Article
- Transcriptional dynamics and chromatin accessibility in the regulation of shade-responsive genes in Arabidopsis.Genome biology · 2025Article
- The Gene Expression of the Transcription Factors HY5 and HFR1 Is Involved in the Response ofBiology · 2025Article
- CRY1-GAIP1 complex mediates blue light to hinder the repression of PIF5 on AGL5 to promote carotenoid biosynthesis in mango fruit.Plant biotechnology journal · 2025Article
- A PIF-regulated switch in cell axis growth drives cotyledon expansion through tissue-specific cell expansion and division.The Plant journal : for cell and molecular biology · 2025Article
- Lights, location, action: shade avoidance signalling over spatial scales.Journal of experimental botany · 2025Review
- NO and HInternational journal of molecular sciences · 2024Review
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Authors and funding
7 authors at 3 institutions in 2 countries.
Funding
Abstract
Reductions in red to far-red ratio (R:FR) provide plants with an unambiguous signal of vegetational shade and are monitored by phytochrome photoreceptors. Plants integrate this information with other environmental cues to determine the proximity and density of encroaching vegetation. Shade-sensitive species respond to reductions in R:FR by initiating a suite of developmental adaptations termed shade avoidance. These include the elongation of stems to facilitate light foraging. Hypocotyl elongation is driven by increased auxin biosynthesis promoted by PHYTOCHROME INTERACTING FACTORs (PIF) 4, 5 and 7. UV-B perceived by the UV RESISTANCE LOCUS 8 (UVR8) photoreceptor rapidly inhibits shade avoidance, in part by suppressing PIF4/5 transcript accumulation and destabilising PIF4/5 protein. Here, we show that longer-term inhibition of shade avoidance is sustained by ELONGATED HYPOCOTYL 5 (HY5) and HY5 HOMOLOGUE (HYH), which regulate transcriptional reprogramming of genes involved in hormone signalling and cell wall modification. HY5 and HYH are elevated in UV-B and suppress the expression of XYLOGLUCAN ENDOTRANSGLUCOSYLASE/HYDROLASE (XTH) genes involved in cell wall loosening. They additionally increase expression GA2-OXIDASE1 (GA2ox1) and GA2ox2, encoding gibberellin catabolism enzymes that act redundantly to stabilise the PIF-inhibiting DELLA proteins. UVR8 therefore regulates temporally distinct signalling pathways to first rapidly inhibit and subsequently maintain suppression of shade avoidance following UV-B exposure.
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Registered trials
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