摘要
利用组织透明法和石蜡制片法对樟科21属、112种、5变种和2变型植物叶中油细胞的分布密度、油细胞与粘液细胞(腔)的形态结构及其在叶肉中的具体分布进行了比较研究。油细胞和粘液细胞(腔)是樟科植物叶片解剖的显著特征,其在叶肉中的分布可以划分为4种类型:只有油细胞分布;只有粘液细胞(腔)分布;油细胞和粘液细胞(腔)共存;油细胞和粘液细胞(腔)皆无。油细胞的分布密度、油细胞与粘液细胞(腔)是否共存、是否单独存在或无,以及其具体分布部位等方面在种间存在一定的差异,这对于属以下等级的区分具有一定意义。在本科内甚至在某些属内,油细胞和粘液细胞(腔)分布的4种类型的演化趋势为:只有油细胞分布→油细胞与粘液细胞(腔)共存→只有粘液细胞(腔)分布→油细胞与粘液细胞(腔)皆无。油细胞和粘液细胞(腔)4种分布类型的划分支持樟科两个亚科的划分。
The distribution density of oil cells, the morphology and structure of both oil and mucilage cells, and their localization in the mesophyll of 112 species, 5 varieties and 2 forms in 21 genera of the Lauraceae are comparatively studied with the methods of tissue clearing and paraffin sectioning. The results show that there exist obvious differences of the distribution density of oil cells among the species in the Lauraceae. The presence of oil cells and mucilage cells is found to be a marked anatomical feature of the leaves in most of the plants in the Lauraceae. Their distribution in the mesophyll can be divided into 4 types: type Ⅰ, in which only oil cells are present ; type Ⅱ, in which both the oil and mucilage cells are present; type Ⅲ, in which only mucilage cells are present; type Ⅳ, in which neither oil cells nor mucilage cells are present. The distribution density of oil cells, the distribution types of oil cells and mucilage cells and their localization in the mesophyll are of some taxonomic value at the specific level in the Lauraceae. In the whole Lauraceae or in some large genera, the evolutionary trend of the distribution types of oil cells and mucilage cells might be as follows: typeⅠ→ type Ⅱ→type Ⅲ→ type Ⅳ. The characteristics of the 4 distribution types of oil cells and mucilage cells support the division of two subfamilies in the Lauraceae.
出处
《植物分类学报》
CSCD
1999年第6期529-540,共12页
Acta Phytotaxonomica Sinica
基金
陕西省自然科学基金
