Yuzou Sano's chapter on bordered pit
structure and resistance to cavitation is worthy of a wide audience, because it covers structures and processes basic to the successful functioning of wood.
pairs control movement of water from one tracheary element to the next in the wood of vascular plants (Zimmermann, 1983; Pittermann et al.
Mechanical tissue is composed of fibre with distinctly bordered pit
(fibre-tracheids), numerous, occasionally septate fibres with simple pits, of medium length, sometimes with helical thickenings (Metcalfe and Chalk, 1983).
Many studies have shown that the increased permeability occurring during water storage of logs is a result of the decomposition of bordered pit
membranes, ray parenchyma cells, and resin canals by bacterial action (Knuth and MeCoy 1962, MacPeak 1963, Greaves 1969).
Torus-bearing intervascular pit membranes are part of the bordered pit
pairs connecting tracheary elements in roots of Osmanthus armatus and Osmanthus americanus.
Frequently, the pit membrane is aspirated and the torus blocks one of the apertures of a given bordered pit
pair (compare Figs.
Thus, bordered pit
pairs provide passageways for water moving from cell to cell.
1), and it is the pits between tracheary elements (the so-called bordered pit
The transport from conduit to conduit is achieved through small valves termed bordered pits
Single row radial bordered pits
are also characteristic of Picea.
are circular to hexagonal (11 [micro]m) with circular to slit-like, crossed apertures (4-5 [micro]m).
Implicit in the concepts of Bailey (1944) and the tabular data on bordered pits
by Metcalfe & Chalk (1950, xlv) is the idea that the tracheid is the primitive (plesiomorphic) type of imperforate tracheary element in angiosperms, and that it has evolved, in'evcrsibly, into fiber-tracheids in various clades, followed by libriform fibers.