Comparative anatomy on leaves of Fissistigma (Annonaceae) from China
- 生命科学－已发表论文 
采用叶片表皮离析法、扫描电镜和石蜡制片法,研究了中国分布的番荔枝科瓜馥木属19种植物叶片的形态结构。结果表明:瓜馥木属叶片形态和结构具有较多的相; 似性,如叶片表皮均具有2-多个细胞的单列丝状毛,表皮细胞内具有一个晶簇,气孔器均为平列型,只分布在叶片的远轴面,远轴面的表皮细胞平周壁形成一个乳; 突,叶片主脉的维管组织除具有正常的维管组织外,还具有一个小的副维管束等,这些特征有助于区分番荔枝科植物的属间关系,支持瓜馥木属是一个很自然的类群; 。但叶片表皮毛的形态及分布,表皮细胞的形状、叶肉中栅栏组织和海绵组织的结构、远轴面的乳突大小以及叶主脉维管组织的细微结构则具有种间差异。尤其有助; 于区分小萼瓜馥木和黑风藤、广西瓜馥木和独山瓜馥木、上思瓜馥木和东方瓜馥木等形态相似、难以区分的植物种类。该研究结果为该属的系统研究和种间正确区分; 提供了重要资料。Leaf morphology and structures of nineteen species of Fissistigma from; China were studied using epidermal maceration,scanning electron; microscope and paraffin section method. The results showed that the; anatomical feathers of Fissistigma revealed a remarkable consistency.; The leaf surface of Fissistigma were covered with bicellulate or; multicellulate uniseriate trichomes. The epidermal cells contained one; clustered crystal. The stomatal apparatus were paracytic with two to; four subsidiary cells and only distributed on abaxial epidermis. The; outer percilinal walls of abaxial epidermal cells were papllate. In the; leaf midrib,there was one additional vascular strand except for normal; vascular tissues. Therefore, these anatomical feathers should be; contributed to differentiate the relationship among genera and support; that Fissistigma is a natural group in Annonaceae. However,the form and; distribution of trichomes,the shape of epidermal cells,the structures of; mesophyll tissues,the sizes of papllate cells and the precise vascular; structures in midrib vary obviously with species. Also,these anatomical; differences between species may be used to distinguish some perplexing; species such as F. minuticalyx and F. polyanthum,F. kwangsiense and F.; cavaleriei,F. tungfangense and F. shangtzeense.