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新疆针禾属(StipagrostisNees)植物叶片解剖结构的比较

, PP. 133-138

Keywords: 大颖针禾(Stipagrostis,grandiglumis),羽毛针禾(Stipagrostis,pennata),,解剖结构,抗旱生理,新疆

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Abstract:

利用光学显微镜,对新疆荒漠中针禾属植物大颖针禾(Stipagrostisgrandiglumis)和羽毛针禾(Stipagrostispennata)叶片进行微观形态结构特征的观察与比较。结果表明大颖针禾和羽毛针禾的叶都具有典型的适应干旱及沙漠环境的形态结构特征;2种针禾叶片表面均具有角质层,但厚度不同;两者上表皮均密生刺毛,表皮细胞外切向壁较厚,径向壁较薄,而且表皮细胞特征及气孔类型、叶脉形状及维管束数目等具有明显的种间差异,这些显微形态差异为探讨该属的系统演化关系及属下分类提供了叶解剖学证据。

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