十四种凤仙花属植物种皮微形态特征及其分类学意义

通过扫描电镜对凤仙花属(Impatiens)14种植物的种子表皮微形态特征进行了观察。根据种皮表面纹饰及衍生物的特点,将该属植物的种皮微形态特征划分为4种类型,即光滑型、颗粒型、网状型和隆起型,后两者又可细分为若干亚型,其中负网状亚型和网状-丘状隆起亚型为首次报导。研究表明,14种凤仙花属植物种子表皮微形态特征差异显著,它们作为属内种的分类鉴别特征具有重要价值;种子表皮的微形态学特征与其植物体的部分表型特征具有相关性,在一定程度上反映了属内类群的分化。

Micromorphological Features of Seed Surface of Fourteen Species in Impatiens (Balsaminaceae) in Relation to Their Taxonomic Significance

Micromorphological features of seed surface of 14 species in Impatiens L. were examined under the scanning electron microscope (SEM). According to the characters of the epidermal ornamentation of seed coat and the granules on the cell surface, the micromorphological features of seed surfaces in Impatiens could be divided into 4 types, namely, laevigate, granulate, reticulate and protrusive. The latter two types could be further divided into subdivisions according to the shape of the epidermal ornamentation of the seed coat. The areolate subtype in I.lemeei and the reticulate- colliculate subtype in I.stenosepala were observed for the fist time. The results showed that there were predominant differences among the 14 species, and therefore could be used as reliable diagnostic characters to identify species. The micromorphological features of seed surface were closely correlated with the gross morphology characters, suggesting their important systematic significances.