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    Developmental regulation of mannan, arabinogalactan-protein and pectic epitopes in pistils of Vicia faba (faba bean)

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    Authors
    Chen, Wen
    Stoddard, Fred L.
    Baldwin, Timothy C.
    Issue Date
    2006
    
    Metadata
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    Abstract
    Cell walls of the stigma and style are important zones for cell‐cell recognition, nutrition, guidance, and protection of the pollen tube along the transmitting tract. The objective of this study was to investigate the modulation of selected cell wall epitopes during pistil development in the crop species Vicia faba L. (faba bean). An immunocytochemical investigation of pistil development was performed using a panel of four anti–cell wall/plasma membrane antibodies at both light and electron microscope levels during the 4 days leading up to anthesis. The selected antibodies recognized mannan‐containing polysaccharides (antimannan antisera), β‐1,4‐galactan (LM5), α‐1,5‐l‐arabinan (LM6), and arabinogalactan/arabinogalactan‐protein (AG/AGP) epitopes, with GlcpUA‐β‐1,→3‐d‐GalpUA‐α‐1,→2‐l‐Rha trisaccharide motifs (JIM13). Mannan accumulation was shown to be associated with the formation and maturation of sclerenchyma cells and xylem elements. The β‐1,4‐galactan and α‐1,5‐l‐arabinan epitopes were highly expressed in the walls of parenchyma and epidermis in a developmentally regulated manner. AG/AGP epitopes were particularly abundant in the stigma and cells lining the stylar canal, together with the α‐1,5‐l‐arabinan epitope recognized by LM6. These data suggest an association of AGs/AGPs with pollen tube growth, of mannan with strengthening and stiffening the pistil, and of β‐1,4‐galactan and α‐1,5‐l‐arabinan components with tissue flexibility within the pistil.
    Citation
    International Journal of Plant Sciences, 167(5): 919-932
    Publisher
    University of Chicago Press
    URI
    http://hdl.handle.net/2436/17033
    DOI
    10.1086/506330
    Additional Links
    http://www.journals.uchicago.edu/doi/abs/10.1086/506330
    Type
    Journal article
    Language
    en
    Description
    Metadata only
    ISSN
    10585893
    15375315
    ae974a485f413a2113503eed53cd6c53
    10.1086/506330
    Scopus Count
    Collections
    Faculty of Science and Engineering

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