春黄菊族6属植物种子的微形态特征

应用光学显微镜和扫描电镜对春黄菊族6属10种的种子微形态特征进行了比较观察。结果表明:10种种子在种子形态、表面纹饰、脐处的喙状突起、种子端的衣领状环等方面都表现出丰富的多样性,例如茼蒿的穴状和芫荽菊的细胞状纹饰等,具有明显的属级水平上的分类特征;在系和种级水平上,微形态特征虽有相似性,但仍具有一定的分类学价值,如龙蒿系圆头蒿的沟壑状纹饰和猪毛蒿系猪毛蒿的搓板状纹饰等。说明春黄菊族植物丰富的种子微形态特征在其系统分类中具有重要的参考价值;本研究结果支持栉叶蒿属、紊蒿属、茼蒿属独立成属的观点。

Micromorphological Features of Seed from Six Genera Plants in Tribe Anthemideae

Light microscope and scanning electron microscope were used to examine micro-morphological features of the seeds of ten species belonging to six genera of tribe Anthemideae comparatively.It was shown that the seeds of the ten species were richly diverse in shape,surface ornamentation,omphaloidean rostriform enation,terminal collar-shaped ring for instance,hole-shaped ornamentations of Chrysanthemum coronarium L.and the cellulated ornamentations of C.anthemoides L.which are clearly taxonomical features on genus level;on section and species levels,the micro-morphological features were of certain taxonomical values although they appeared similar,for instance,gully ornamentations of Artemisia asphaerocephala Krasch.and washboard-shaped ornamentations of A.scoparia Waldst.et Kit..These indicated that rich micro-morphological features of the seeds of tribe anthemideae plants were of important reference values in their phylogenic classification.The results of the study support the viewpoint that Neopallasia(Pall.) Poljak,Elachanthemum Ling et Y.R.Ling and Chrysanthemum L.are independent genera.