菊科千里光族款冬亚族的花粉超薄结构及其系统学意义

POLLEN WALL ULTRASTRUCTURES OF THE SUBTRIBE TUSSILAGININAE (ASTERACEAE: SENECIONEAE) OF THE EASTERN ASIA AND THEIR SYSTEMATIC AND TAXONOMIC SIGNIFICANCE

摘要: 研究了国产菊科千里光族款冬亚族及其相关类群11属15种植物的花粉超薄结构。研究类群的花粉超薄结构可分为2类:“千里光型”和“向日葵型”。多榔菊属、大吴风草属和毛冠菊属为“向日葵型”, 其余种类均为“千里光型”。根据花粉超薄结构类型, 结合其它有关方面的研究, 认为大吴风草属与橐吾属并不近缘, 而毛冠菊属可能接近于紫菀族。

Abstract: The pollen wall ultrastructures of 15 species, representing 11 genera in the Subtribe Tussilagininae and related taxa of Trib.Senecioneae (Asteraceae) from China were investigated under TEM.There are two types of pollen wall ultrastructure:“Helianthoid” and “Senecioid”.The “Helianthoid” type was detected in Doronicum, Farfugium and Nannoglottis while the “Senecioid” was found in the remained genera.Based mainly on the present investigation and combined with the other evidence, it is suggested that Farfugium should not be related to the Ligularia, and Nannoglottis should be near to the Astereae.