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作 者 ：苏旭;刘玉萍;陈克龙

期 刊 ：植物研究 2012年 32卷 2期 页码：129-136

关键词：小颖组；宽颖组；长颖组；叶表皮；系统关系；

Keywords:sect.Elymus, sect.Turczaninovia, sect.Macrolepis, leaf epidermis, biosystematic relationship,

摘 要 ：观察了披碱草属中小颖组、宽颖组和长颖组主要代表种的叶表皮形态学特征，总结了3组植物叶表皮结构的异同，探讨了叶表皮特征的分类学意义。同时，根据3组植物叶表皮性状的演化趋势，分析了各组的演化关系和系统位置。结果表明，小颖组最原始，宽颖组较进化，长颖组最高级；小颖组可能直接派生了较进化的宽颖组，并在宽颖组的基础上进而产生了最高级的长颖组。小颖组、宽颖组和长颖组的这一系统关系与利用外部形态特征所获得的演化趋势基本一致。

Abstract:The leaf epidermises of the major species of sect.Elymus, sect.Turczaninovia and sect.Macrolepis in Elymus were examined, their similarities and differences on the leaf epidermis were summarized, and the taxonomic significance of leaf epidermal features among them was discussed as well. Furthermore, according to the evolutionary trends of leaf epidermal characteristics of three sects, their evolutionary positions and relationships were inferred. The results show that the sect. Elymus is the most primitive one among these three sects, the sect.Turczaninovia is slightly more advanced than the former, and the sect.Macrolepis is the most advanced of them; the sect.Elymus might produce immediately the sect.Turczaninovia, whereas the sect.Macrolepis might derive immediately form the sect.Turczaninovia. The biosystmatic relationships of these three sects are corroborated by the evolutionary trend of external morphology.

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