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  • 1
    ISSN: 1615-6102
    Keywords: Actin ; Cadherin ; Catenin ; Endoplasmic-reticulum membrane ; Maize ; Root
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary With heterologous antibodies raised against animal N-cadherin, α-catenin, and β-catenin, we have visualized their reactive proteins within cells of maize root apices. Embedding using Steedman's wax allowed us to accomplish tissue-specific analysis which revealed that cells of epidermis, endodermis/pericycle, and outer stele tissues, all of which are tightly associated to each other, are especially enriched with presumed plant homologues of N-cadherin and both catenins. In the root epidermis, trichoblasts initiating root hairs showed prominent accumulations of cadherin-like antigens at outgrowing domains where they co-localize with actin. Close associations of cadherin-like proteins with F-actin were detected in parenchymatic cells of the stele, also at the immunogold electron microscopy level. A possible role of these interesting proteins in membrane-membrane interactions is indicated by their prominent accumulations at endoplasmic-reticulum-enriched pit-field-based plant cell adhesion domains in plasmolyzing cells of maize root apices exposed to mannitol. Intriguingly, these unique adhesion domains of plasmolyzing cells are enriched with endoplasmic-reticulum-resident calreticulin. Cadherin-like, but not catenin-like, proteins were abundant also within the nucleoplasm.
    Type of Medium: Electronic Resource
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