ArticlePlant physiology2009
The tryptophan conjugates of jasmonic and indole-3-acetic acids are endogenous auxin inhibitors.
Article in Plant physiology, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 74 papers.
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Who cites it
74 citing papers in PubMed, 193 citations in OpenAlex.
- Metabolism meets transport: a new perspective on auxin homeostasis at subcellular level.Planta · 2026Review
- Auxin homeostasis: new roads in a tight network.Journal of experimental botany · 2025Article
- Phenylacetic acid metabolism in land plants: novel pathways and metabolites.Journal of experimental botany · 2025Article
- Cytosolic- and membrane-localized oxidized indole-3-acetic acid formation regulates developmental auxin transients.Plant physiology · 2025Article
- Arabidopsis GH3.10 conjugates jasmonates.Plant biology (Stuttgart, Germany) · 2025Article
- Interplay between auxin and abiotic stresses in maize.Journal of experimental botany · 2025Review
- The dynamic and diverse nature of parenchyma cells in the Arabidopsis root during secondary growth.Nature plants · 2025Article
- Global impacts of peroxisome and pexophagy dysfunction revealed through multi-omics analyses of lon2 and atg2 mutants.The Plant journal : for cell and molecular biology · 2024Article
- Different viral effectors hijack TCP17, a key transcription factor for host Auxin synthesis, to promote viral infection.PLoS pathogens · 2024Article
- Exploring the specialized metabolome of the plant pathogen Streptomyces sp. 11-1-2.Scientific reports · 2024Article
- An auxin research odyssey: 1989-2023.The Plant cell · 2024Review
- The Roles of GRETCHEN HAGEN3 (GH3)-Dependent Auxin Conjugation in the Regulation of Plant Development and Stress Adaptation.Plants (Basel, Switzerland) · 2023Review
- Integrated Transcriptome and Metabolome Analysis Revealed the Causal Agent of Primary Bud Necrosis in 'Summer Black' Grape.International journal of molecular sciences · 2023Article
- Metabolic profiles of 2-oxindole-3-acetyl-amino acid conjugates differ in various plant species.Frontiers in plant science · 2023Article
- PaintOmics 4: new tools for the integrative analysis of multi-omics datasets supported by multiple pathway databases.Nucleic acids research · 2022Article
- An Arabidopsis mutant deficient in phosphatidylinositol-4-phosphate kinases ß1 and ß2 displays altered auxin-related responses in roots.Scientific reports · 2022Article
- Alkaline stress reduces root waving by regulating PIN7 vacuolar transport.Frontiers in plant science · 2022Article
- Metabolism, signaling, and transport of jasmonates.Plant communications · 2021Review
- The role of auxin during early berry development in grapevine as revealed by transcript profiling from pollination to fruit set.Horticulture research · 2021Article
- Understanding the Intricate Web of Phytohormone Signalling in Modulating Root System Architecture.International journal of molecular sciences · 2021Review
14 more citing papers are in PubMed but not listed here.
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1 author at 1 institution in 1 country.
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No grant is acknowledged in the PubMed record.
Abstract
Most conjugates of plant hormones are inactive, and some function to reduce the active hormone pool. This study characterized the activity of the tryptophan (Trp) conjugate of jasmonic acid (JA-Trp) in Arabidopsis (Arabidopsis thaliana). Unexpectedly, JA-Trp caused agravitropic root growth in seedlings, unlike JA or nine other JA-amino acid conjugates. The response was dose dependent from 1 to 100 microm, was independent of the COI1 jasmonate signaling locus, and unlike the jasmonate signal JA-isoleucine, JA-Trp minimally inhibited root growth. The Trp conjugate with indole-3-acetic acid (IAA-Trp) produced a similar response, while Trp alone and conjugates with benzoic and cinnamic acids did not. JA-Trp and IAA-Trp at 25 microm nearly eliminated seedling root inhibition caused by 2 microm IAA. The TIR1 auxin receptor is required for activity because roots of tir1-1 grew only approximately 60% of wild-type length on IAA plus JA-Trp, even though tir1-1 is auxin resistant. However, neither JA-Trp nor IAA-Trp interfered with IAA-dependent interaction between TIR1 and Aux/IAA7 in cell-free assays. Trp conjugates inhibited IAA-stimulated lateral root production and DR5-beta-glucuronidase gene expression. JA-deficient mutants were hypersensitive to IAA and a Trp-overaccumulating mutant was less sensitive, suggesting endogenous conjugates affect auxin sensitivity. Conjugates were present at 5.8 pmol g(-1) fresh weight or less in roots, seedlings, leaves, and flowers, and the values increased approximately 10-fold in roots incubated in 25 microm Trp and IAA or JA at 2 microm. These results show that JA-Trp and IAA-Trp constitute a previously unrecognized mechanism to regulate auxin action.
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