摘要
首次报道滇产秋海棠属46种3变种叶表皮及毛被的扫描电镜特征。研究表明所有种的特征组合均有明显区别,因而这些微形态特征可作为分种和变种的依据。在每个组内难以找到一致的特征,因而在组的划分上意义不大,但秋海棠组内毛被和表皮特征的分化却为探讨一些组间的关系提供了某些线索。另外,通过探讨各组内毛被的发生和生态环境的关系,似可看出侧膜组应为较原始的类型,从而推断各组间的关系。
The leaf epidermis and the epidermal hair of 46 species and 3 varieties of Begonia L. from Yunnan have been studied by SEM for the first time. Their characters are classified and terminologized. The epidermal cell morpha can be divided into six types (multiangle, irregular oblate, spheroid, papillate, and conical). The cuticle layer of epidermal cell can be divided into six types (smooth, tuberulate, reticulate, striped, cornet, and spiral). The morpha of trichome cell can be divided into four types (square, multiangle, oblong, and elliptic). The cuticle layer of trichome cell can be divided into four types (smooth, tuberculate, piliferous, and cornute). The epidermal hair can be divided into three categories, and six types (uniserial: lanes and pubes, complex hair, multiseriate: tubercular-based seta, conical seta and rough hair). The result shows that combination of various characteristics for epidermal cell and its hair varies from species to species. Therefore, they can be used as taxonomic evidence in the classification of species and varieties. However, without identical characteristics in each section, they are not significant in distinguishing sections. Nevertheless, in Sect. Begonia, the diversity of epidermal cell and its hair may indicate that it has some relationships with some other sections, Through the analysis of the relationships between hair occurrence and plant living environments, it is proposed that Sect. Coelococtron may be more primitive than the others and a possible evolutionary relationship of various sections from Yunnan is inquired.
出处
《云南植物研究》
CSCD
1999年第3期309-316,共8页
Acta Botanica Yunnanica
基金
云南省教委科学资金!资助项目 9112 0 91
