毛冠菊属的花粉形态和结构及其系统学意义(英文)  

POLLEN MORPHOLOGY AND DETAILED STRUCTURE OF THE GENUS NANNOGLOTTIS AND ITS SYSTEMATIC IMPLICATIONS

作　　者：张小平[1] 

机构地区：[1]安徽师范大学生物学系,芜湖241000

出　　处：《微体古生物学报》2000年第2期228-233,共6页Acta Micropalaeontologica Sinica

基　　金：国家教委优秀年轻教师基金资助项目

摘　　要：对国产菊科特有属毛冠菊属的花粉形态和结构进行了光学显微镜、扫描电镜和透射电镜的观察和研究。该属的花粉可以分为圆球形、扁球形和长球形三种类型。种之间的花粉差异主要表现在大小、形状和外壁纹饰的细微变化等方面。与紫菀族、千里光族和旋覆花族三个族的代表种的花粉特征进行对比分析 ,并结合其它生物演化证据 ,可得到以下结论 :( 1 )支持 Hand- Mazzetti的分类意见 ,毛冠菊属应归于紫菀族中 ;( 2 )毛冠菊属的花粉可划分为圆球形、扁球形和长球形三种类型 ,其中圆球形占多数 ,并且是较原始的类型 ,由此演变成其它两种形状的花粉 ;( 3)根据花粉由近球形到长球形或扁球形的演化趋势 ,赞成传统形态分类将 N annoglottisgynura归于较原始的类群 -狭苞组的分类处理。This study presents a detailed survey and discussion on the pollen morphology and structure of Nannoglottis with light microscopy(LM), SEM, and TEM. Measurements of the polar axis and equatorial diameter, exine thickness, spine length, and spine number at each lobe are made. Differences were observed both between representatives of different tribes and between species of the same genus. The principal differences in pollen among the various species were in size, shape and subtle variations of the surface ornamentation. Three kinds of pollen types can be recognized in the whole genus, namely, spheroidal type, prolate type and oblate type. Combined with both palynological and biosystematic evidences, the data support Hand Mazzetti's taxonomic treatment that put Nannoglottis in the tribe Astereae, rather than under the tribes Senecioneae or Inuleae.

关 键 词：菊科 毛冠菊属 花粉形态 花粉结构 系统位置 

分 类 号：Q914[天文地球—古生物学与地层学]