ArticleThe Plant cell2014
Tomato Pistil Factor STIG1 Promotes in Vivo Pollen Tube Growth by Binding to Phosphatidylinositol 3-Phosphate and the Extracellular Domain of the Pollen Receptor Kinase LePRK2.
Article in The Plant cell, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 39 papers.
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Who cites it
39 citing papers in PubMed, 81 citations in OpenAlex.
- Plant Peptides on the Rise: From Historical Insight to Future Applications.Plant biotechnology journal · 2026Review
- Molecular Regulatory Mechanism of Inflorescence, Flower and Fruit Development in Tomato.Plants (Basel, Switzerland) · 2026Review
- Comparative proteomic analysis of self-compatible and self-incompatible genotypes of fennel (Foeniculum vulgare Mill.).BMC plant biology · 2025Article
- Gene expression and pollen performance indicate altered postmating selection between Solanum species with different mating systems.G3 (Bethesda, Md.) · 2025Article
- Peptides in plant reproduction-small yet powerful.Frontiers in plant science · 2025Review
- Small Peptides: Orchestrators of Plant Growth and Developmental Processes.International journal of molecular sciences · 2024Review
- Comprehensive meta-analysis of QTL and gene expression studies identify candidate genes associated withFrontiers in plant science · 2023Article
- Tomato plant response to heat stress: a focus on candidate genes for yield-related traits.Frontiers in plant science · 2023Review
- Mechanisms of prezygotic post-pollination reproductive barriers in plants.Frontiers in plant science · 2023Review
- The phospholipid flippase ALA3 regulates pollen tube growth and guidance in Arabidopsis.The Plant cell · 2022Article
- Article
- Comparative Flower Transcriptome Network Analysis RevealsPlants (Basel, Switzerland) · 2022Article
- Peptides/receptors signaling during plant fertilization.Frontiers in plant science · 2022Review
- Finding newFrontiers in plant science · 2022Review
- Sheet-like clay nanoparticles deliver RNA into developing pollen to efficiently silence a target gene.Plant physiology · 2021Article
- Links between Regulatory Systems of ROS and Carbohydrates in Reproductive Development.Plants (Basel, Switzerland) · 2021Review
- Arabinogalactan glycoprotein dynamics during the progamic phase in the tomato pistil.Plant reproduction · 2021Article
- Possible role of small secreted peptides (SSPs) in immune signaling in bryophytes.Plant molecular biology · 2021Article
- Biosensors: A Sneak Peek into Plant Cell's Immunity.Life (Basel, Switzerland) · 2021Review
- Function of Small Peptides During Male-Female Crosstalk in Plants.Frontiers in plant science · 2021Review
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Authors and funding
4 authors at 2 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The speed of pollen tube growth is a major determinant of reproductive success in flowering plants. Tomato (Solanum lycopersicum) STIGMA-SPECIFIC PROTEIN1 (STIG1), a small Cys-rich protein from the pistil, was previously identified as a binding partner of the pollen receptor kinase LePRK2 and shown to promote pollen tube growth in vitro. However, the in vivo function of STIG1 and the underlying mechanism of its promotive effect were unknown. Here, we show that a 7-kD processed peptide of STIG1 is abundant in the stigmatic exudate and accumulates at the pollen tube surface, where it can bind LePRK2. Antisense LePRK2 pollen was less responsive than wild-type pollen to exogenous STIG1 in an in vitro pollen germination assay. Silencing of STIG1 reduced both the in vivo pollen tube elongation rate and seed production. Using partial deletion and point mutation analyses, two regions underlying the promotive activity of the STIG1 processed peptide were identified: amino acids 80 to 83, which interact with LePRK2; and amino acids 88 to 115, which bind specifically to phosphatidylinositol 3-phosphate [PI(3)P]. Furthermore, exogenous STIG1 elevated the overall redox potential of pollen tubes in both PI(3)P-dependent and LePRK2-dependent manners. Our results demonstrate that STIG1 conveys growth-promoting signals acting through the pollen receptor kinase LePRK2, a process that relies on the external phosphoinositide PI(3)P.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.