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Article

The SPA quartet: a family of WD-repeat proteins with a central role in suppression of photomorphogenesis in arabidopsis.

The Plant cell - 1 Sept 2004

Laubinger Sascha, Fittinghoff Kirsten, Hoecker Ute

Abstract excerpt

The Arabidopsis thaliana proteins suppressor of phytochrome A-105 1 (SPA1), SPA3, and SPA4 of the four-member SPA1 protein family have been shown to repress photomorphogenesis in light-grown seedlings. Here, we demonstrate that spa quadruple mutant seedlings with defects in SPA1, SPA2, SPA3, and SPA4 undergo strong constitutive photomorphogenesis in the dark. Consistent with this finding, adult spa quadruple...

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Topics

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Share to Adaptation, Physiological
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Methodology Data sources Editorial policy Privacy About Contact Helena Bioinformatics

Share to Light Signal Transduction

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Source

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Identifiers

PMID: 15308756
DOI: 10.1105/tpc.104.024216
PMCID: PMC520934

Genes

COP1

Provenance

PubMed metadata and Literature Corpus relationships. Corpus snapshot updated 7 Sept 2026. Manifest publication-graph-cohort-2026-09-07.1.

Source receipt: pubmed, retrieved 7 Sept 2026.

Related research

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Click a neighbor to travelStep 1 · 12 closest

The SPA quartet: a family of WD-repeat proteins with a central role in suppression of photomorphogenesis in arabidopsis.PMID 15308756Read ↗

The SPA1-like proteins SPA3 and SPA4 repress photomorphogenesis in the light.Semantic proximity Read ↗

SPA1, a WD-repeat protein specific to phytochrome A signal transduction.Semantic proximity Read ↗

Arabidopsis phytochrome B promotes SPA1 nuclear accumulation to repress photomorphogenesis under far-red light.Semantic proximity Read ↗

Mutations in the N-terminal kinase-like domain of the repressor of photomorphogenesis SPA1 severely impair SPA1 function but not light responsiveness in Arabidopsis.Semantic proximity Read ↗

Arabidopsis SPA proteins regulate photoperiodic flowering and interact with the floral inducer CONSTANS to regulate its stability.Semantic proximity Read ↗

Photoreceptor Specificity in the Light-Induced and COP1-Mediated Rapid Degradation of the Repressor of Photomorphogenesis SPA2 in Arabidopsis.Semantic proximity Read ↗

Arabidopsis COP1 and SPA genes are essential for plant elongation but not for acceleration of flowering time in response to a low red light to far-red light ratio.Semantic proximity Read ↗

CONSTITUTIVELY PHOTOMORPHOGENIC1 is required for the UV-B response in Arabidopsis.Semantic proximity Read ↗

SPA Proteins Affect the Subcellular Localization of COP1 in the COP1/SPA Ubiquitin Ligase Complex during Photomorphogenesis.Semantic proximity Read ↗

Functional analysis of COP1 and SPA orthologs from Physcomitrella and rice during photomorphogenesis of transgenic Arabidopsis reveals distinct evolutionary conservation.Semantic proximity Read ↗

The phytochrome A-specific signaling intermediate SPA1 interacts directly with COP1, a constitutive repressor of light signaling in Arabidopsis.Semantic proximity Read ↗

The Arabidopsis SPA1 gene is required for circadian clock function and photoperiodic flowering.Semantic proximity Read ↗

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