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• W2039068045 endingPage "e102407" @default.
• W2039068045 startingPage "e102407" @default.
• W2039068045 abstract "The regulation of pollen development and pollen tube growth is a complicated biological process that is crucial for sexual reproduction in flowering plants. Annexins are widely distributed from protists to higher eukaryotes and play multiple roles in numerous cellular events by acting as a putative linker between Ca2+ signaling, the actin cytoskeleton and the membrane, which are required for pollen development and pollen tube growth. Our recent report suggested that downregulation of the function of Arabidopsis annexin 5 (Ann5) in transgenic Ann5-RNAi lines caused severely sterile pollen grains. However, little is known about the underlying mechanisms of the function of Ann5 in pollen. This study demonstrated that Ann5 associates with phospholipid membrane and this association is stimulated by Ca2+ in vitro. Brefeldin A (BFA) interferes with endomembrane trafficking and inhibits pollen germination and pollen tube growth. Both pollen germination and pollen tube growth of Ann5-overexpressing plants showed increased resistance to BFA treatment, and this effect was regulated by calcium. Overexpression of Ann5 promoted Ca2+-dependent cytoplasmic streaming in pollen tubes in vivo in response to BFA. Lactrunculin (LatB) significantly prohibited pollen germination and tube growth by binding with high affinity to monomeric actin and preferentially targeting dynamic actin filament arrays and preventing actin polymerization. Overexpression of Ann5 did not affect pollen germination or pollen tube growth in response to LatB compared with wild-type, although Ann5 interacts with actin filaments in a manner similar to some animal annexins. In addition, the sterile pollen phenotype could be only partially rescued by Ann5 mutants at Ca2+-binding sites when compared to the complete recovery by wild-type Ann5. These data demonstrated that Ann5 is involved in pollen development, germination and pollen tube growth through the promotion of endomembrane trafficking modulated by calcium. Our results provide reliable molecular mechanisms that underlie the function of Ann5 in pollen." @default.
• W2039068045 created "2016-06-24" @default.
• W2039068045 creator A5008255088 @default.
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• W2039068045 creator A5055739074 @default.
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• W2039068045 date "2014-07-14" @default.
• W2039068045 modified "2023-09-27" @default.
• W2039068045 title "Annexin5 Plays a Vital Role in Arabidopsis Pollen Development via Ca2+-Dependent Membrane Trafficking" @default.
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• W2039068045 doi "https://doi.org/10.1371/journal.pone.0102407" @default.
• W2039068045 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4097066" @default.
• W2039068045 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25019283" @default.
• W2039068045 hasPublicationYear "2014" @default.
• W2039068045 type Work @default.

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