Plant Cytokinesis – Insights Gained from Electron Tomography Studies 273
Fig. 8 Changes in cell plate volume and surface area during the different stages of
somatic-type cytokinesis. The numbers in the bars indicate the mean cell plate volume
(A)andsurfacearea(B)per 1 μm^3 ±SD, and the numbers next to theblack arrowsreflect
the net growth unit cell plate volume or surface area in terms of Golgi-derived vesicle
equivalents. Thegray dotted arrowindicates net loss changes in cell plate surface area in
terms of clathrin-coated vesicle equivalents. As a reference, the estimated final cell wall
volume and surface area values also are displayed
5.4
Maturation of a Tubulo-Vesicular-Type Cell Plate into a Tubular Network
and a Sheet-like Cell Plate Requires Callose Synthesis and Membrane Recycling,
but not a CPAM
Breakdown of the solid phragmoplast CPAM and of the associated MTs sig-
nals the end of tubulo-vesicular cell plate growth and the onset of cell plate
maturation. The transformation of the growing tubulo-vesicular cell plate
into a maturing tubular network cell plate manifests itself by the deposition