ArticleThe Plant cell2010
Arabidopsis FIMBRIN5, an actin bundling factor, is required for pollen germination and pollen tube growth.
Article in The Plant cell, 2010. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 64 papers.
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64 citing papers in PubMed, 112 citations in OpenAlex.
- Drosophila embryo cellularization is tuned by the viscoelastic properties of membrane-cortex linkers.Biophysical journal · 2026Article
- FIMBRIN2 Regulates ABA-Induced Stomatal Closure by Promoting Microfilament Bundling and Turnover in Arabidopsis Guard Cells.Plant direct · 2026Article
- Cytoskeletal control of development and environmental adaptation in plants.Science China. Life sciences · 2026Review
- Kinesins control male germ unit assembly for sperm delivery in Arabidopsis.Nature plants · 2025Article
- Genome-wide characterization and expression profiling of FIMBRIN gene family members in response to abiotic stress in Medicago sativa.BMC plant biology · 2025Article
- Functional Characterization ofInternational journal of molecular sciences · 2025Article
- A land plant-specific VPS13 mediates polarized vesicle trafficking in germinating pollen.The New phytologist · 2025Article
- An involvement of a new zinc finger protein PbrZFP719 into pear self-incompatibility reaction.Plant cell reports · 2025Article
- The Arabidopsis KASH protein SINE3 is involved in male and female gametogenesis.Plant reproduction · 2024Article
- Comparative stigmatic transcriptomics reveals self and cross pollination responses to heteromorphic incompatibility inFrontiers in genetics · 2024Article
- Differential sensitivity of ADF isovariants to a pH gradient promotes pollen tube growth.The Journal of cell biology · 2023Article
- Over-expression of GhACTIN1 under the control of GhSCFP promoter improves cotton fiber and yield.Scientific reports · 2023Article
- Role of Actin Dynamics andGenes · 2023Review
- Activation of actin-depolymerizing factor by CDPK16-mediated phosphorylation promotes actin turnover in Arabidopsis pollen tubes.PLoS biology · 2023Article
- Actin-bundling protein fimbrin regulates pathogenicity via organizing F-actin dynamics during appressorium development in Colletotrichum gloeosporioides.Molecular plant pathology · 2022Article
- Phospholipase Dδ regulates pollen tube growth by modulating actin cytoskeleton organization inPlant signaling & behavior · 2021Article
- Hyperoside promotes pollen tube growth by regulating the depolymerization effect of actin-depolymerizing factor 1 on microfilaments in okra.Horticulture research · 2021Article
- The quest for the central players governing pollen tube growth and guidance.Plant physiology · 2021Review
- An Update on the Role of the Actin Cytoskeleton in Plasmodesmata: A Focus on Formins.Frontiers in plant science · 2021Review
- Transcriptomic and Proteomic Insights intoPlant physiology · 2020Article
4 more citing papers are in PubMed but not listed here.
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Authors and funding
7 authors at 3 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Actin cables in pollen tubes serve as molecular tracks for cytoplasmic streaming and organelle movement and are formed by actin bundling factors like villins and fimbrins. However, the precise mechanisms by which actin cables are generated and maintained remain largely unknown. Fimbrins comprise a family of five members in Arabidopsis thaliana. Here, we characterized a fimbrin isoform, Arabidopsis FIMBRIN5 (FIM5). Our results show that FIM5 is required for the organization of actin cytoskeleton in pollen grains and pollen tubes, and FIM5 loss-of-function associates with a delay of pollen germination and inhibition of pollen tube growth. FIM5 decorates actin filaments throughout pollen grains and tubes. Actin filaments become redistributed in fim5 pollen grains and disorganized in fim5 pollen tubes. Specifically, actin cables protrude into the extreme tips, and their longitudinal arrangement is disrupted in the shank of fim5 pollen tubes. Consequently, the pattern and velocity of cytoplasmic streaming were altered in fim5 pollen tubes. Additionally, loss of FIM5 function rendered pollen germination and tube growth hypersensitive to the actin-depolymerizing drug latrunculin B. In vitro biochemical analyses indicated that FIM5 exhibits actin bundling activity and stabilizes actin filaments. Thus, we propose that FIM5 regulates actin dynamics and organization during pollen germination and tube growth via stabilizing actin filaments and organizing them into higher-order structures.
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