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• W2104949747 abstract "Abstract Pollen tubes must navigate through different female tissues to deliver sperm to the embryo sac for fertilization. Protein disulfide isomerases play important roles in the maturation of secreted or plasma membrane proteins. Here, we show that certain T-DNA insertions in Arabidopsis thaliana PDIL2-1, a protein disulfide isomerase (PDI), have reduced seed set, due to delays in embryo sac maturation. Reciprocal crosses indicate that these mutations acted sporophytically, and aniline blue staining and scanning electron microscopy showed that funicular and micropylar pollen tube guidance were disrupted. A PDIL2-1-yellow fluorescent protein fusion was mainly localized in the endoplasmic reticulum and was expressed in all tissues examined. In ovules, expression in integument tissues was much higher in the micropylar region in later developmental stages, but there was no expression in embryo sacs. We show that reduced seed set occurred when another copy of full-length PDIL2-1 or when enzymatically active truncated versions were expressed, but not when an enzymatically inactive version was expressed, indicating that these T-DNA insertion lines are gain-of-function mutants. Our results suggest that these truncated versions of PDIL2-1 function in sporophytic tissues to affect ovule structure and impede embryo sac development, thereby disrupting pollen tube guidance." @default.
• W2104949747 created "2016-06-24" @default.
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• W2104949747 date "2008-12-01" @default.
• W2104949747 modified "2023-10-02" @default.
• W2104949747 title "Truncation of a Protein Disulfide Isomerase, PDIL2-1, Delays Embryo Sac Maturation and Disrupts Pollen Tube Guidance in<i>Arabidopsis thaliana</i>" @default.
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• W2104949747 doi "https://doi.org/10.1105/tpc.108.062919" @default.
• W2104949747 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2630445" @default.
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• W2104949747 hasPublicationYear "2008" @default.
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