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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Cortical bundle ： ウィキペディア英語版 Cortical bundle The cortical bundle is a vascular system which allows the transportation of water and nutrients through the voluminous cortex of the cactus. This system is unique to cacti, and helps to replace the water lost to the dry desert air. The cortical bundle emerges radially from the xylem and produces shoots that run tangentially to the cortex, branching extensively and vascularizing every part of the cortex.〔(The particularity of the Cactus Cortex ), Cactus Art.〕 The size of the cortical bundle can vary greatly from species to species.〔(Transverse section of cactus stem ). ''Plant Anatomy'', James D. Mauseth.〕 Because cacti live a long time, the cortical bundles have to function for many years. In every cactus species, the cortical bundles produce secondary phloems. In very old cortical bundles located at the base of very old shoots, the secondary phloem may attain a thickness of several millimeters.〔(Cortical Bundles in the Persistent, Photosynthetic Stems of Cacti ). ''Annals of Botany'', Volume 70, Issue 4, pg 317-324.〕 ==References== 〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cortical bundle」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.