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  1. Atomic force microscopy of torus-bearing pit membranes

    Atomic force microscopy was used to compare the structures of dried, torus-bearing pit membranes from four woody species, three angiosperms and one gymnosperm. Tori of Osmanthus armatus are bipartite consisting of a pustular zone overlying parallel sets of microfibrils that form a peripheral corona. Microfibrils of the corona form radial spokes as they traverse the...

    https://www.fs.usda.gov/treesearch/search?keywords=%22margo%22

    Author(s):
    Roland R. Dute; Thomas Elder
    Year:
    2011
    Keywords:
    AFM, atomic force microscope, Cerocarpus, Osmanthus, Pinus, Ulmus, pit membrane, torus
    Source:
    IAWA Journal 32(4):415-430

  2. Pit membranes of Ephedra resemble gymnosperms more than angiosperms

    Bordered pit pairs of Ephedra species were characterized using different types of microscopy. Pit membranes contained tori that did not stain for lignin. SEM and AFM views of the torus surface showed no plasmodesmatal openings, but branched, secondary plasmodesmata were occasionally noted using TEM in conjunction with ultrathin sections. The margo consisted of radial...

    https://www.fs.usda.gov/treesearch/search?keywords=%22margo%22

    Author(s):
    Roland Dute; Lauren Bowen; Sarah Schier; Alexa Vevon; Troy Best; Maria Auad; Thomas Elder; Pauline Bouche; Steven Jansen
    Year:
    2014
    Keywords:
    Keywords: Atomic force microscopy, margo, plasmodesmata, scanning electron microscopy, torus, transmission electron microscopy.
    Source:
    International Association of Wood Anatomists 35(3), 217-235

  3. A broad survey of hydraulic and mechanical safety in the xylem of conifers

    Drought-induced forest dieback has been widely reported over the last decades, and the evidence for a direct causal link between survival and hydraulic failure (xylem cavitation) is now well known. Because vulnerability to cavitation is intimately linked to the anatomy of the xylem, the main objective of this study was to better understand the xylem anatomical...

    https://www.fs.usda.gov/treesearch/search?keywords=%22margo%22

    Author(s):
    Pauline S. Bouche; Maximilien Larter; Jean-Christophe Domec; Regis Burlett; Peter Gasson; Steven Jansen; Sylvain Delzon
    Year:
    2014
    Keywords:
    Cavitation resistance, hydraulic efficiency, mechanical strength, seal capillary-seeding, torus–margo pit, xylem anatomy, wall implosion
    Source:
    Journal of Experimental Botany

  4. Bordered pit structure and function determine spatial patterns of air-seeding thresholds in xylem of Douglas-fir (Pseudotsuga menziesii; Pinaceae) trees.

    The air-seeding hypothesis predicts that xylem embolism resistance is linked directly to bordered pit functioning. We tested this prediction in trunks, roots, and branches at different vertical and radial locations in young and old trees of Pseudotsuga menziesii. Dimensions of bordered pits were measured from light and scanning electron micrographs...

    https://www.fs.usda.gov/treesearch/search?keywords=%22margo%22

    Author(s):
    J.C. Domec; B. Lachenbruch; F.C. Meinzer
    Year:
    2006
    Keywords:
    Bordered pit, branch, earlywood, embolism, hydraulic architecture, latewood, margo, root, trunk
    Source:
    American Journal of Botany. 93(11): 1588-1600.
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