Suberized walls

CELL WALL SUBERIZED WALL PLASMA MEMBRANE CYTOPLASM VACUOLE... 

The polyester domains of suberized walls can also be depolymerized using chemical and/or enzymatic approaches similar to those used for cutin. The aromatic domains are far more difficult to depolymerize as C-C and C-O-C crosslinks are probably present in such domains. Therefore, more drastic degradation procedures such as nitrobenzene, CuO oxidation, or thioglycolic... 

Suberized cell walls are some of the last components of tree barks that remain after being buried in soil for years [135]. Fungi can penetrate suberized walls as... 

In some species, however, e.g. ash, Fraxinus excelsior, cells of the traumatic axial parenchyma of the compartmentalization wall 4 may show no evidence of cell wall alterations, yet appear to act normally as a functional barrier to decay (Pearce, R.B., unpublished data). It is to be presumed that the spread of decay fungi is arrested either by chemical defences or by environmental constraints (cf. 26-28) in such species. Clearly, a contribution may be made by these defences in suberizing species also phytoalexin-like antifungal compounds have been detected in association with a suberized wall 4 barrier in Acer saccharinum (42). More work will be required to elucidate the long-term effectiveness of the various mechanisms maintaining the function of these barrier walls. 

Suberized walls.. In cork, wounded areas of plants, endo-dermis. Alcoholic extract of chlorophyll, in the dark, imparts a green color. Alcannin and Sudan III impart a red coloration. Converted into yellowish droplets and granular masses upon heating with a strong solution of KOH. Sulpuhric acid is resisted. 

Cutinized walls.. Forming outer walls of many epidermal cells. As for suberized walls. 

Fig. 6.4.3. Electron micrographs of suberized walls of Solarium tuberosum tuber periderm (1), bundle sheaths of Zea mays (courtesy of Dr. T.R O Brien) (2), the chalazal region of the inner seed coat of Citrus paradisi (3), hypodermis in Zea mays root grown in Mg -deficient medium (4), and idioblast from Agave americana leaf (5). Arrowheads, LS = lamellar suberin...

Anacardiaceae Pachycormus discolor LM Thick suberized walls 136... 

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