ArticlePlant physiology2023
PbrBZR1 interacts with PbrARI2.3 to mediate brassinosteroid-regulated pollen tube growth during self-incompatibility signaling in pear.
Article in Plant physiology, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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10 citing papers in PubMed, 16 citations in OpenAlex.
- Chromosome doubling is associated with enhanced self-compatibility and transcriptional remodeling of pollen-pistil interactions in Lycium chinense.Plant cell reports · 2026Article
- Brassinosteroid signaling promotes stone cell lignification by enhancing nuclear accumulation of PbrBEH3 in pear fruit.The Plant journal : for cell and molecular biology · 2026Article
- The Ubiquitin-Proteasome System in Flowering Plant Reproduction: Mechanisms, Functional Diversity, and Regulatory Networks.Plants (Basel, Switzerland) · 2026Review
- The FmMYC2-FmLOX6 module promotes pollen germination and tube growth via regulating JA homeostasis in Fraxinus mandshurica.Plant cell reports · 2026Article
- Comparative Transcriptomic Analysis Reveals Key Pathways and Genes Involved in Late-Acting Self-Incompatibility inCurrent issues in molecular biology · 2026Article
- PbrRALF5/10 prevents incompatible pollen tube death by reconstructing the methyl-esterified pectin and reactive oxygen species metabolism of pear in vitro.Plant molecular biology · 2025Article
- Molecular mechanisms and genetic regulation of self-incompatibility in flowering plants: implications for crop improvement and evolutionary biology.Plant molecular biology · 2025Review
- Function diversity of the expansin subfamily genes inFrontiers in plant science · 2025Article
- Sex on Steroids: How Brassinosteroids Shape Reproductive Development in Flowering Plants.Plant & cell physiology · 2024Review
- Molecular insights into self-incompatibility systems: From evolution to breeding.Plant communications · 2024Review
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9 authors at 1 institution in 1 country.
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No grant is acknowledged in the PubMed record.
Abstract
S-RNase-mediated self-incompatibility (SI) prevents self-fertilization and promotes outbreeding to ensure genetic diversity in many flowering plants, including pear (Pyrus sp.). Brassinosteroids (BRs) have well-documented functions in cell elongation, but their molecular mechanisms in pollen tube growth, especially in the SI response, remain elusive. Here, exogenously applied brassinolide (BL), an active BR, countered incompatible pollen tube growth inhibition during the SI response in pear. Antisense repression of BRASSINAZOLE-RESISTANT1 (PbrBZR1), a critical component of BR signaling, blocked the positive effect of BL on pollen tube elongation. Further analyses revealed that PbrBZR1 binds to the promoter of EXPANSIN-LIKE A3 (PbrEXLA3) to activate its expression. PbrEXLA3 encodes an expansin that promotes pollen tube elongation in pear. The stability of dephosphorylated PbrBZR1 was substantially reduced in incompatible pollen tubes, where it is targeted by ARIADNE2.3 (PbrARI2.3), an E3 ubiquitin ligase that is strongly expressed in pollen. Our results show that during the SI response, PbrARI2.3 accumulates and negatively regulates pollen tube growth by accelerating the degradation of PbrBZR1 via the 26S proteasome pathway. Together, our results show that an ubiquitin-mediated modification participates in BR signaling in pollen and reveal the molecular mechanism by which BRs regulate S-RNase-based SI.
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