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Cited by 107Plant Molecular Biology ResearchLight effects on plantsPlant Parasitism and Resistance

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Gibberellin signaling

Hartweck, Lynn M.·2008·Planta
DOI 10.1007/s00425-008-0830-1
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Abstract

This review covers recent advances in gibberellin (GA) signaling. GA signaling is now understood to hinge on DELLA proteins. DELLAs negatively regulate GA response by activating the promoters of several genes including Xerico, which upregulates the abscisic acid pathway which is antagonistic to GA. DELLAs also promote transcription of the GA receptor, GIBBERELLIN INSENSITIVE DWARF 1 (GID1) and indirectly regulate GA biosynthesis genes enhancing GA responsiveness and feedback control. A structural analysis of GID1 provides a model for understanding GA signaling. GA binds within a pocket of GID1, changes GID1 conformation and increases the affinity of GID1 for DELLA proteins. GA/GID1/DELLA has increased affinity for an F-Box protein and DELLAs are subsequently degraded via the proteasome. Therefore, GA induces growth through degradation of the DELLAs. The binding of DELLA proteins to three of the PHYTOCHROME INTERACTING FACTOR (PIF) proteins integrates light and GA signaling pathways. This binding prevents PIFs 3, 4, and 5 from functioning as positive transcriptional regulators of growth in the dark. Since PIFs are degraded in light, these PIFs can only function in the combined absence of light and presence of GA. New analyses suggest that GA signaling evolved at the same time or just after the plant vascular system and before plants acquired the capacity for seed reproduction. An analysis of sequences cloned from Physcomitrella suggests that GID1 and DELLAs were the first to evolve but did not initially interact. The more recently diverging spike moss Selaginella has all the genes required for GA biosynthesis and signaling, but the role of GA response in Selaginella physiology remains a mystery.

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Metadata

Authors
Hartweck, L. M.
Affiliations
University of Minnesota (US)
Corresponding author
Hartweck, Lynn M.
ORCID
Hartweck, Lynn M.
Venue
Planta
Publisher
Springer Science and Business Media LLC
Published
2008-10-21
Volume
229
Issue
1
Pages
1-13
ISSN
  • 0032-0935 (ISSN-L)
  • 1432-2048
DOI
10.1007/s00425-008-0830-1
OpenAlex
W3192237296
Cited by
107
References
107
Citations by year
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FWCI
0.68
Type
journal article
Language
en
Open access
closed
Licence
www.springer.com/tdm (tdm)
Locations
  • Planta (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Light effects on plants
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Parasitism and Resistance
Keywords
gibberellin signaling, DELLA proteins, GID1, gibberellin biosynthesis, proteasome, phytochrome-interacting factors, light signaling, plant growth regulation, Physcomitrella, Selaginella, vascular system evolution
MeSH terms
Biological Evolution, Gibberellins, Light, Plant Proteins, Signal Transduction, Gene Regulatory Networks

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Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

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How to cite

Cite CoChat for the checks on this page, and the paper for its own findings.

This page
CoChat. (2026). Citation check: Gibberellin signaling. https://app.cochat.ai/papers/10.1007/s00425-008-0830-1
The paper
Hartweck, L. M. (2008). Gibberellin signaling. Planta. https://doi.org/10.1007/s00425-008-0830-1