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纹孔有哪几种类型各有何特征
更新时间: 2020-07-03 00:00:00  

纹孔有各种大小和细微结构,可区分为单纹孔与具缘纹孔两种类型。单纹孔通常成对存在,初生壁两侧相对的原纹孔之间,由胞间层和初生壁形成的纹孔膜隔开,而具缘纹孔在纹孔腔周围向细胞内延伸。二者主要区别是具缘纹孔的次生壁向细胞腔内隆起形成一个穹形的边缘,而围绕单纹孔的次生壁边缘是与初生壁近乎垂直的。

关键词: 类型 特征

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