中国金缕梅科叶表皮毛的变异与演化

中国科学院大学学报

中国金缕梅科叶表皮毛的变异与演化

方炎明, 樊汝汶

(南京林业大学，南京210037)

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:1993-03-10 发布日期:1993-03-10
通讯作者: 方炎明

Variation and Evolution of Leaf Trichomes in the Chinese Hamamelidaceae

Fang Yan-ming, Fan Ru-wen

Received:1900-01-01 Revised:1900-01-01 Online:1993-03-10 Published:1993-03-10
Contact: Fang Yan-ming

摘要/Abstract

摘要：

本文以金缕梅科13属25种植物为代表，在光镜和电镜下观察了其表皮毛的微形态和类型。参

照Theobald的方案，将该科的表皮毛分为四种类型。这些类型在不同亚科和属间的分布呈现出系

统演化意义。作者从表皮毛类型的角度讨论了该科的系统演化问题。

关键词: 金缕梅科, 表皮毛, 微形态, 系统发育趋势

Abstract:

Leaves of 25 species which cover 13 genera of the Chinese Hamamelidaceae

(sensu lato ) were examined by light microscope (LM) and scanning electron microscope

(SEM) to reveal the nature and variation of trichomes. The trichomes showed greater di-

versity under SEM than under LM and naked eyes. Based on Theobald’s scheme, they

can be divided into four types:

1. Simple trichomes: Unbranched, curved or straight (Altingia, liquidambar,

Semiliquidambar; 2. 2- 4 armed trichomes: Two to four branched (Corylopsis,

Loropetalum, sinowilsonia); 3. Stellate trichomes: With more than five branches. They may be

tufted (Forthunearia, Loropetalum, sinowilsonia, Hamamelis, Distylium) or storied (Eustigma);

4. Scales: Peltate and flattened. In the genus Rhodoleia, the scales are totally composed of

small boat-shaped ones, whereas in the genus Sycopsis they are rotately branched on the

verge but unbranched and flattened in the middle.

The distribution of trichome types is of grest significance in hamamelidaceous

phylogeny. The simple trichomes mainly exist in Liquidambaroideae and

Exbucklandioideae, the stellate and 2-4 armed trichomes occur in Hamamelidoideae, and

the scales are confined to Sycopsis (Hamamelidoideae) and Rhodoleia (Rhodoleioideae).

From this fact, the authors consider that there are two evolutionary lines in the family,

i. e. the Disanthoideae- Exbucklandioideae- Liquidambaroideae line and the

Rhodoleioideae-Hamamelidoideae line though some subfamilies are isolated.

Within Hamamelidoideae, the trichome types also have taxonomic significance.

Corylopsis is a primitive group, whereas Eustigma, Distylium and Sycopsis are respectively

on the top of evolutionary branches and the other genera are transitional groups. These

genera might be separated as tribes, Corylopsideae, Eustigmateae, Distylieae, Sycopsideae

and Hamamelideae. The relationships among these tribes are given in Fig. l.

Key words: Hamamelidaceae, Trichomes, Micromorphology, Phylogeny

方炎明, 樊汝汶. 中国金缕梅科叶表皮毛的变异与演化[J]. 中国科学院大学学报.

Fang Yan-ming, Fan Ru-wen. Variation and Evolution of Leaf Trichomes in the Chinese Hamamelidaceae[J]. .

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