摘要
本文对毛茛科38属88种植物导管分子的穿孔板结构进行了比较观察。根据穿孔板的结构可分为三种型式:(1)单穿孔板,这类穿孔板较普遍存在。(2)梯状穿孔板,发现有26属37种植物的导管分子具有此类穿孔板。芍药属和星果草属植物导管分子均只具有梯状穿孔板,无单穿孔板。在其他种中,可见或多或少地具有梯状穿孔板,而其中有的具有较少的横条或具过渡型的穿孔板。(3)“买麻藤式”穿孔板,在11属12种植物中可见到这类穿孔板,它们被认为是由网状穿孔板演化为单穿孔板时的过渡类型。
This paper deals with comparative studies of the perforation structures of vessel elements in 88 species of 38 genera of Ranunculaceae.Three types of perforation structure were recog- nized in these species.(1)The simple perforation plate was comparatively universal and wide- spread,(2)The scalariform perforation plate was demonstrated in 37 species of 26 genera of Ranunculaceae.The vessel elements of Paeonia and Asteropyrum showed only typical sca- lariform perforation plates,whereas in other species,the vessel elements were provided with, to a lesser or greater extent,scalariform perforation plates,some of which showed fewer bars or transitional perforation plates.(3)“Gnetalean type”perforation plate was found in 12 species of 11 genera.This perforation plate might be considered as a transitional type from reticulated perforation plate to the simple perforation plate.
关键词
毛莨科
穿孔板
导管分子
Ranunculaceae
Perforation plate
Simple perforation plate
Scalariform perforation plate
“Gnetalean type”perforation plate
