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suberin
Suberin is a waterproofing waxy substance found in higher plants. Suberin is a main constituent of cork, and is named after the cork oak, ''Quercus suber''. Its main function is as a barrier to movement of water and solutes.
==Anatomy and physiology==
Suberin is highly hydrophobic and a somewhat 'rubbery' material. In roots suberin is deposited in the radial and transverse cell walls of the endodermal cells. This structure, known as the Casparian strip or Casparian band, functions to prevent water and nutrients taken up by the root from entering the stele through the apoplast. Instead, water must bypass the endodermis via the symplast. This allows the plant to select the solutes that pass further into the plant. It thus forms an important barrier to harmful solutes. For example, mangroves use suberin to minimize salt intake from their littoral habitat.
Suberin is found in the phellem layer of the periderm (or cork). This is outermost layer of the bark. The cells in this layer are dead and abundant in suberin, preventing water loss from the tissues below. Suberin can also be found in various other plant structures. For example, they are present in the lenticels on the stems of many plants and the net structure in the rind of a netted melon is composed of suberised cells.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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