中国木兰属和含笑属导管分子的比较解剖

本文对我国木兰科的39种木兰属和含笑属植物次生木质部的导管分子进行了初步分析。两属导管分子的长度和宽度略有差异。木兰属中多数种的导管分于有单穿孔板,但有的可见到梯状穿孔板。含笑属植物的导管分子大多具有梯状穿孔板,仅有一种可看到单穿孔板。在具有梯状穿孔板的木兰属植物中,穿孔板的横隔数目较含笑属的多。木兰属的导管壁上一般无螺纹加厚;含笑属则相反。此外,在两属之间,导管尚存在一些其它差异。

COMPARATIVE ANATOMICAL STUDIES ON THE VESSEL ELEMENTS OF CHINESE MAGNOLIA AND MICHELIA

This paper deals mainly with comparative studies on elements of secondary xylem in 39 species of Chinese Magnolia and Michelia.The former plants present longer and slender ves- sels.Most of them have simple perforation and only a few scalariform perforation plates.In contrast,most of the Michelia species possess scalariform perforation plates and only one with simple perforation.The scalariform perforation plates of Magnolia species,if present,exhibit more bars than that of Michelia.With few exceptions,there is no spiral thickening on the vessel wall in Magnolia,whereas in Michelia it is just the opposite.In addition,some other dif- ferences in vessel elements between these two genera are also discussed.