plant surface microbiology.pdf

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13 Root Surface in Ectomycorrhizas 217
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c d e
Fig. 5a–e. Suberized root cap cell layer covering cell junctions of short roots, but not of
long roots (Picea abies). a Residues of suberized root cap cells covering the cell junction
at the proximal part of a short root, fading away on the cortical cell (arrow). Scale 3 mm.
b Enlargement of cell junction displaying several suberin layers of moribund root cap
cells. Scale 1 mm. c Enlargement of cortical cell displaying fading away of the suberin
layer (arrow). Scale 1 mm. d No suberin layer on the cortical cell wall of a long root. Scale
1 mm. e No suberin layer on top of the cell junction of a long root (scale 1 mm). cc Cortical
cell, cj cell junction, rcc root cap cell, sl suberin layer
ding in Spurr’s resin after fixation in glutaraldehyde yields clear results. The
electron-dense layer on the root hair surface is no longer considered as a cuticle
as was erroneously given in Kottke (1997).
The root cap cells of long roots are not suberized and no cuticle-like layer
exists on the surface of long roots and their cell junctions (Fig. 5d, e).
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