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Topic: Suberin

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	Suberin - Wikipedia, the free encyclopedia
		Suberin is highly hydrophobic and its main function is to prevent water from penetrating the tissue.
		In roots suberin is deposited in the radial and transverse cell walls of the endodermal cells.
		Suberin is found in the phellem layer of the periderm (or cork).
	en.wikipedia.org /wiki/Suberin (373 words)

	Heritability of Suberin Accumulation
		Differences in suberin accumulation among the three parent clones were significant, whereas all environmental sources of variation and their interactions with parent clone were not significant.
		Suberin measurements were taken from three serial sections per slide and these were averaged to obtain the final suberin value for the sample.
		Differences in suberin accumulation among the three parent clones were significant, whereas all environmental sources of variation and their interactions with parent clone were not significant (Table 2).
	www.caf.wvu.edu /bark/suberin.htm (2781 words)

	Glycerol Is a Suberin Monomer. New Experimental Evidence for an Old Hypothesis -- Moire et al. 119 (3): 1137 -- PLANT ...
		suberin layers of the periderm and the exodermis.
		of the suberin of the wound-healing periderm of potato tubers,
		Concentration of the major suberin monomers during the purification of suberin from the periderm of wound-healing potato tuber slices.
	www.plantphysiol.org /cgi/content/full/119/3/1137 (5392 words)

	Planet AMP - Alliance For Minority Participation's Virtual Community (Site not responding. Last check: 2007-10-03)
		Suberin is an insoluble lipophilic biopolymer that functions as a protective layer in the roots of the plant.
		Suberin is also induced in the plant for the purposes of wound healing and in response to other environmental stress factors that occur throughout the life of the plant.
		The horseradish peroxidase enzyme, suberin, and hydroxycinnamic acids at different pH are used in the experiments, and the products of their reaction are identified by the use of the NMR and MS methods.
	nyc-amp.cuny.edu /abstracts/view.asp?ID=695 (298 words)

	Structure of Roots (Site not responding. Last check: 2007-10-03)
		Note how suberin in the root cap functions as an extension of the exodermis to completely encase the root for protection during periods of inactivity.
		Suberin is a hydrophobic mixture of lipids and phenolics deposited in the walls of some plant cells (Kolattukudy 1984).
		These are concentric layers of suberin deposited on the inner surface of cell walls and considered to function as barriers to microbial and solute penetration.
	www.ffp.csiro.au /research/mycorrhiza/root.html (4137 words)

	Meningar.com om suberin. Suberin, lamellae, were mm. (Site not responding. Last check: 2007-10-03)
		Suberin lamellae These are concentric layers of suberin deposited on the inner surface of cell walls and considered to function as barriers to microbial and solute penetration...
		Blue-violet excitation is used to enhance the Sudan IV tests for suberin, cutin, and waxes...
		Cutinase kutinase Esterase enzymer, producerede af svampe til nedbrydning af cutin og suberin DAB 3,3-diaminobenzidine...
	www.meningar.com /suberin.html (886 words)

	Summary of report: Inhibiting the Postharvest Wounding Response in Wildflowers
		A suberin barrier is formed as a generic response to wounding, e.g.
		If this occurred in cut flowers, the suberin barrier could cause premature wilting and a shortened vase life because stems were no longer able to take up water from the vase solution.
		This chemical is known to delay the appearance of suberin in potato tubers.
	www.rirdc.gov.au /reports/WNP/02-114sum.html (770 words)

	Botany online: Dermal Tissues, Parenchyma and Assimilation Tissues - Rhizodermis
		This is a cross section of an older rice root that is stained with flourestic berberine and with aniline blue counter stain.
		This suberin can be stained using a special dye and appears when viewed under fluorescent light.
		The casparian strip appears as light spots in the endodermis in a longitudinal section through the root, but the suberin is laid down in a continuous layer that cannot be seen in longitudinal sections.
	www.biologie.uni-hamburg.de /b-online/e05/05b.htm (785 words)

	Georgia FACES - Best Dressed Trees Wear Polyester
		Suberin is a waxy waterproofer and wooden wall primer.
		Suberin is one of the most effective barrier or wall materials in a tree.
		It includes a large portion of suberin to shield and protect the living portions of the tree.
	georgiafaces.caes.uga.edu /viewtext.cfm?id=55 (523 words)

	Plant Biology (Site not responding. Last check: 2007-10-03)
		Changing the dimensions of suberin lamellae of green cotton fibers with a specific inhibitor of the endoplasmic reticulum-associated fatty acid elongases.
		Whereas the amounts of most suberin monomers were not negatively affected by the inhibitor treatment, the amounts of alpha,omega-alkanedioic acids and of glycerol were reduced by more than 80%.
		The suberin layers were discontinuous and consisted of fewer lamellae than in the controls.
	www.unifr.ch /plantbio/Instit/abstracts/abstract1.html (198 words)

	Abst
		The possible protective effect of a suberin extract from Quercus suber cork on acridine orange (AO)-, ofloxacin- and UV radiation-induced mutagenicity (bleaching activity) in Euglena gracilis was examined.
		Suberin exhibits a significant dose-dependent protective effect against AO-induced mutagenicity and the concentration of 500 µg/ml completely eliminates the Euglena-bleaching activity of AO.
		However, the moderate protective effect of suberin on UV radiation-induced mutagenicity was observed only at concetrations 500 and 1000 µg/ml.
	www.fns.uniba.sk /~ubb/Abst.htm (2684 words)

	Let Potato Wounds Heal
		One of these phenolic substances is called "suberin" and is the origin of the term "suberization." Suberin is a complex fat-based phenolic material.
		This process occurs within the cells just beneath the new suberin layer, where a series of new cross walls are laid down parallel to the wounded surface.
		The area where this occurs is a new meristem and is called the "phellogen." After a series of cell divisions, the end result is a layer of flattened, brick-shaped cells usually four to six cells deep.
	www.wvu.edu /~agexten/hortcult/homegard/potato.htm (598 words)

	Etheses Record Display \| Library \| University of Waterloo
		The suberized epidermal walls were permeable to apoplastic tracers, differing from those of cells with suberized Casparian bands, possibly due to the spatial distribution or chemical components of the suberin.
		Suberin may occur in a diffuse form linked with other wall components in the epidermis.
		Two of the monomers detected (hydroxycarboxylic acid and a,ω-dicarboxylic acid) are known to be characteristic suberin markers.
	etheses.uwaterloo.ca /display.cfm?ethesis_id=786 (379 words)

	Suberin - Ecophysiology - IZMB (Site not responding. Last check: 2007-10-03)
		Suberin in roots is deposited in the cell walls of the endodermis (Casparian bands) and the hypodermis forming apoplastic transport barriers between the soil and roots.
		Using analytical techniques, such as gas chromatography and mass spectrometry, characterization of the chemical composition of endodermal and hypodermal root cell walls is carried out (Franke et al.
		Elongases involved in suberin biosynthesis in roots are analysed by molecular biological and biochemical techniques (Schreiber et al.
	www.botanik.uni-bonn.de /schreiber/suberin.en.shtml (136 words)

	Apoplasmic Barriers and Oxygen Transport Properties of Hypodermal Cell Walls in Roots from Four Amazonian Tree Species ...
		Suberin is a heterogeneous extracellular biopolymer closely attached to the inner primary cell wall (Schreiber et al., 1999
		The aliphatic suberin composition of the RHCWs from the evergreen
		Graça J, Pereira H (2000b) Suberin in potato periderm: glycerol, long-chain monomers, and glyceryl and feruloyl dimers.
	www.plantphysiol.org /cgi/content/full/132/1/206 (5966 words)

	Suberin Molecular Biology (Site not responding. Last check: 2007-10-03)
		The biosynthesis of suberin involves a wide range of metabolic processes as carbon is diverted into both the poly(phenolic) and poly(aliphatic) domains of the final product.
		We have mapped out the metabolic steps that must occur during suberization [Figure 1], using our knowledge of the basic building blocks of the two suberin domains as a guide.
		However, our efforts are limited by our incomplete knowledge of the composition of suberin, the overall structure of the final polymer, the dynamics of monomer synthesis and polymer assembly as well as how the individual pieces are linked biosynthetically.
	publish.uwo.ca /~bernards/suberin_molecular_biology.htm (128 words)

	Stems (Site not responding. Last check: 2007-10-03)
		The outer part of the bark is protected by layers of dead cork cells impregnated with suberin.
		Suberin is waxy and cuts down water loss from the stem.
		But suberin is as impervious to air as it is to water.
	home.comcast.net /~john.kimball1/BiologyPages/S/Stems.html (298 words)

	Prediction of Lignin and Suberin ...
		Biggs, A. Prediction of lignin and suberin deposition in boundary zone tissue of wounded tree bark using accumulated degree days.
		The phellogen of cultivated apple, sweet cherry, and peach trees was wounded at regular intervals beginning in early May and ending in late Aug. 1983.
		The same sections were examined under ultraviolet epi-illumination to determine the extent of suberin deposition in the boundary zone tissue formed from cells present at the time of wounding.
	www.caf.wvu.edu /bark/abstracts/biggs86b.htm (176 words)

	Laboratori de Suro (Site not responding. Last check: 2007-10-03)
		In contrast with most woody plants, in cork oak, the cork cambium (phellogen) is a permanent layer that adds a new layer of cork (phellem) to the outer bark of the tree each year.
		Due to phenoxy radicals generated during suberin synthesis, cork cells are subjected to very high endogenous oxidative stress.
		Our strategy is to identify genes expressing in differentiating cork cells, mainly genes related to cell survival in high oxidative stress condition and genes related with the suberin synthesis.
	ciencies.udg.es /ciencies/depart/biologia/suro/pag1intrANG.htm (235 words)

	4 page summary of the full research report - Combatting wildflower wounding response - SR 115
		Researchers experimenting with a number of wound-inhibiting chemicals and treatments hope to be able to extend the shelf life of Australian wildflowers and increase the range of species suitable for export.
		Their work indicates that an hydrophobic substance, suberin, forms a barrier causing premature wilting because stems are no longer able to take up water from vase solutions.
		Although suberin was not observed 48 hours after cutting, the initial stages of pit membrane modification identified may be followed by a deposit of granular/fibrillar material and then suberin.
	www.rirdc.gov.au /pub/shortreps/sr115.html (1448 words)

	Changing the Dimensions of Suberin Lamellae of Green Cotton Fibers with a Specific Inhibitor of the Endoplasmic ... (Site not responding. Last check: 2007-10-03)
		Changing the Dimensions of Suberin Lamellae of Green Cotton Fibers with a Specific Inhibitor of the Endoplasmic Reticulum-Associated Fatty Acid Elongases -- Schmutz et al.
		suberin monomers were shortened to chain lengths of C16 and C18.
		probably because of the shortening of the aliphatic suberin monomers.
	intl.plantphysiol.org /cgi/content/abstract/110/2/403 (275 words)

	Wound-induced suberization in potato tuber (Solanum tuberosum L.): inhibition by endogenous compounds.
		The cell walls of the outer group of peridermal cells, phellem cells, are laminated with suberin, a complex, inert biopolyester, which provides a protective barrier for the tuber.
		Suberin is composed of two distinctly different biochemical components: a polyphenolic component and a polyaliphatic component.
		Delay of suberin polyphenolic accumulation inhibited subsequent suberin polyaliphatic accumulation.
	abstracts.aspb.org /pb2000/public/P30/0465.html (270 words)

	OhioLINK ETD: Deshmukh, Ashish (Site not responding. Last check: 2007-10-03)
		Differences in the chemical and physical nature of the polymethylenic chains among biopolymers was correlated with their ability to sorb and retain a PAH like phenanthrene.
		While tomato cutin is composed of amorphous polymethylenic structures, Agave americana cutan and potato suberin are semi-crystalline.
		Differential scanning calorimetry shows that cutin is a rubbery polymer, while cutan and suberin are glassy polymers.
	www.ohiolink.edu /etd/view.cgi?acc_num=osu1054564060 (760 words)

	Olympus MIC-D: Darkfield Gallery - Parenchyma Abscission Layer
		The abscission layer is comprised of minute tubules designed to transport water to the leaf, flower, or fruit and carry carbohydrates back into the tree.
		In the autumn, cells in the abscission secrete a waxy substance (suberin) and begin to swell, reducing the amount of nutrients and water that flow through the tubes.
		Without fresh raw materials, leaves cannot produce chlorophyll and the green color, which dominates trees throughout the spring and summer, fades to reveal the orange and bright yellow colors of previously masked pigments.
	www.olympusmicro.com /micd/galleries/darkfield/abscissionlayerlow.html (521 words)

	Suberin - Wikipedia
		Suberin ist ein pflanzliches Biopolymer, dass in Zellwänden eingelagert ist.
		Namengebend für Suberin ist die Korkeiche (Quercus suber).
		Da allerdings das Suberin gegenwärtig nur nach Depolymerisation untersucht werden kann, stehen nähere Hinweise zur genauen Struktur noch aus.
	de.wikipedia.org /wiki/Suberin (278 words)

	Can Ca2+ Fluxes to the Root Xylem Be Sustained by Ca2+-ATPases in Exodermal and Endodermal Plasma Membranes? -- Hayter ...
		suberin lamellae were not propagated to endodermal cells with
		Moore CA, Bowen HC, Scrase-Field S, Knight MR, White PJ (2002) The deposition of suberin lamellae determines the magnitude of cytosolic Ca elevations in root endodermal cells subjected to cooling.
		Nagahashi G, Thompson WW, Leonard RT (1974) The Casparian strip as a barrier to the movement of lanthanum in corn roots.
	www.plantphysiol.org /cgi/content/full/136/4/4318 (4491 words)

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