suberin การใช้

• Suberin can also be found in various other plant structures.
• Lignin and suberin are the only known biological polymers that are irregular.
• Most are cork cells of plant bark contain suberin.
• Suberin is found in the phellem layer of the periderm ( or cork ).
• Both cutin and suberin are polyesters that function as permeability barriers to the movement of water.
• In bark, phlobaphenes accumulate in the phellem layer of cork cambium, part of the suberin mixture.
• The cells in this layer are dead and abundant in suberin, preventing water loss from the tissues below.
• Often, other polymers such as lignin, suberin or cutin are anchored to or embedded in plant cell walls.
• At this point, the cork cambium begins to form the periderm, consisting of protective cork cells containing suberin.
• In addition to the aromatics and aliphatics components, glycerol has been reported a major suberin component in some species.
• :Lipid monomers ( like palmitate ) can be part of polymers, like cutin, cutan, and suberin.
• The role of glycerol is proposed to interlink aliphatic monomers, and possibly also to link polyaliphatics to polyaromatics, during suberin polymer assembly.
• The monolignols are monomers that are polymerized to generate various forms of lignin and suberin, which are used as a structural component of plant cell walls.
• Additional layers may be formed by lignin in xylem cell walls, or suberin in leaf stalk may acquire similar reinforcement to resist the strain of physical forces.
• In older endodermal cells, suberin may be more extensively deposited on all cell wall surfaces and the cells can become lignified, forming a complete waterproof layer.
• Cork cell walls contain suberin, a waxy substance which protects the stem against water loss, the invasion of insects into the stem, and prevents infections by bacteria and fungal spores.
• The evolution of the wood fiber lignin and the bark-sealing, waxy substance suberin variously opposed decay organisms so effectively that dead materials accumulated long enough to fossilise on a large scale.
• In order to maintain a significantly higher concentration in the bundle sheath compared to the mesophyll, the boundary layer of the kranz has a low conductance to, a property that may be enhanced by the presence of suberin.
• The cells of the endodermis typically have their primary cell walls thickened on four sides radial and transverse with suberin, a water-impermeable waxy substance which in young endodermal cells is deposited in distinctive bands called Casparian strips.
• Based on a genetic analysis of mushroom fungi, it was proposed that large quantities of wood were buried during this period because animals and decomposing bacteria had not yet evolved enzymes that could effectively digest the resistant phenolic lignin polymers and waxy suberin polymers.