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红豆杉科、三尖杉科和罗汉松科植物叶片结构的比较观察

COMPARATIVE OBSERVATION ON LEAF STRUCTURE OF TAXACEAE,CEPHALOTAXACEAE AND PODOCARPACEAE

  • 摘要: 扫描电镜和光镜下的叶表皮特征以及叶片解剖结构的研究结果,支持在红豆杉科内建立白豆杉属(Pseudolaxus)的处理方式;赞同在三尖杉属内建立南子三尖杉组。叶片解剖结构方面,三尖杉科和红豆杉科的穗花杉属的相似之处颇多。而叶表皮形态特征方面又表现为三尖杉科和罗汉松科更加接近。反映出了红豆杉科、三尖杉科和罗汉松科之间的密切而又复杂的系统关系。

     

    Abstract: A study on leaf epidermal and anatomical features under SEM and LM shows that it is confirmed to assign Pseudotaxus chienii (Cheng) which was originally described as Taxus chienii (Cheng) to a separate genus; it is rational to establish Sect.Pectinatae in the Cephalotaxus. The Cephalotaxaceae and the Amentotaxus of Taxaceae show many resemblance on leaf anatomical characters,but the Cephalotaxaceae appears to be closely related to Podocarpaceae on the basis of leaf epidermal features. These results suggest that the phylogenetic relationships are both intricate and related among the Taxaceae,Cephalotaxaceae and Podocarpaceae.

     

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