ArticleThe Plant cell2005
The tomato Aux/IAA transcription factor IAA9 is involved in fruit development and leaf morphogenesis.
Article in The Plant cell, 2005. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 254 papers.
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254 citing papers in PubMed.
- The miR167-ARF8 module coordinates stamen-pistil development and fruit set in tomato.The New phytologist · 2026Article
- Exogenous auxin mediates the NnARF9-NnSUS2 module to regulate sucrose synthesis in lotus leaves (Nelumbo nucifera).Planta · 2026Article
- A two-step auxin-GA cross-talk regulates organ formation in tomato.Development (Cambridge, England) · 2026Article
- A cool temperature-induced ubiquitination-controlled transcription factor promotes starch degradation and ripening in kiwifruit.Plant communications · 2026Article
- The Auxin-Induced Protein Gene (MsARG4) Regulates Rapid Stem Elongation and Nutritional Quality Enhancement in Alfalfa.Plants (Basel, Switzerland) · 2026Article
- Study of the molecular mechanism of seedless fruit formation regulated by the blueberry BR6OX1 gene via heterologous transformation in tomato and transcriptomic analysis.Plant cell reports · 2026Article
- Plasma Membrane-Localized PtCOR8 Enhances Cold Tolerance inPlants (Basel, Switzerland) · 2026Article
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- Hybridity of mainly asexually propagating duckweeds in genus Lemna - dead end or breakthrough?The New phytologist · 2026Article
- Enhancement of parthenocarpy and fruit set through genome editing in tomato variety for processing use.Plant biotechnology (Tokyo, Japan) · 2026Article
- Integration ofMolecular breeding : new strategies in plant improvement · 2026Article
- Integrated genome-wide domestication and association analyses reveal the complex genetic basis of parthenocarpy during cucumber domestication.Molecular horticulture · 2026Article
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- Functional characterization of PavIAA6 in sweet cherry: a key regulator of pigmentation, flavor, and nutrient accumulation.BMC plant biology · 2025Article
- Growth regulation during early fruit development in apple (Malus × domestica Borkh.): a temporal event map of transcriptome and phytohormone changes.BMC plant biology · 2025Article
- Salicylic acid and ROS signaling modulate hypocotyl elongation in darkness via NPR1 and EX1.Science advances · 2025Article
- Systematic analysis of the Aux/IAA gene family in pineapple reveals insights into their structural diversity, expression dynamics, and interaction networks.BMC plant biology · 2025Article
- Comparative Analysis of Differentially Expressed Genes and Metabolites in Waxy Maize Inbred Lines with Distinct Twin-Shoot Phenotypes.Plants (Basel, Switzerland) · 2025Article
- CRISPR mediated gene editing for economically important traits in horticultural crops: progress and prospects.Transgenic research · 2025Review
- A feedback loop at the THERMOSENSITIVE PARTHENOCARPY 4 locus controls tomato fruit set under heat stress.Nature communications · 2025Article
194 more citing papers are in PubMed but not listed here.
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Authors and funding
10 authors.
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No grant is acknowledged in the PubMed record.
Abstract
Auxin/indole-3-acetic acid (Aux/IAA) proteins are transcriptional regulators that mediate many aspects of plant responses to auxin. While functions of most Aux/IAAs have been defined mainly by gain-of-function mutant alleles in Arabidopsis thaliana, phenotypes associated with loss-of-function mutations have been scarce and subtle. We report here that the downregulation of IAA9, a tomato (Solanum lycopersicum) gene from a distinct subfamily of Aux/IAA genes, results in a pleiotropic phenotype, consistent with its ubiquitous expression pattern. IAA9-inhibited lines have simple leaves instead of wild-type compound leaves, and fruit development is triggered before fertilization, giving rise to parthenocarpy. This indicates that IAA9 is a key mediator of leaf morphogenesis and fruit set. In addition, antisense plants displayed auxin-related growth alterations, including enhanced hypocotyl/stem elongation, increased leaf vascularization, and reduced apical dominance. Auxin dose-response assays revealed that IAA9 downregulated lines were hypersensitive to auxin, although the only early auxin-responsive gene that was found to be upregulated in the antisense lines was IAA3. The activity of the IAA3 promoter was stimulated in the IAA9 antisense genetic background, indicating that IAA9 acts in planta as a transcriptional repressor of auxin signaling. While no mutation in any member of subfamily IV has been reported to date, the phenotypes associated with the downregulation of IAA9 reveal distinct and novel roles for members of the Aux/IAA gene family.
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