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Tylosis (botany) : ウィキペディア英語版 | Tylosis (botany) A tylosis (plural: tyloses) is a bladder-like distension of a parenchyma cell into the lumen of adjacent vessels in wood. Less certainly, the term tylosis is in use to summarise the physiological process and the resulting occlusion in the xylem of woody plants as response to injury or as protection from decay in heartwood.〔(【引用サイトリンク】title=MSN online dictionary )〕 It is a key process in wall one of the Compartmentalization Of Decay In Trees (CODIT) and other woody plants. ==Anatomy== Observed in section under a microscope, tyloses appear as balloon-like protrusions emanating from axial paratracheal parenchyma cells into xylem vessels through pits linking the two. In some types, there may be a distinct barrier between the tyloses emanating from the pits into the vessels, while they may be barely distinguishable in other cases.
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