【摘要】 利用光学显微镜对山东产蓼属(Polygonum)及近缘植物20种2变种的果实外果皮解剖学特征进行了观察研究。结果表明,其果实外果皮细胞在横切面上为方形、短矩形或狭长矩形,排列为栅栏状,细胞腔形状多样,大小取决于细胞壁增厚程度,具树状分枝或二叉分枝,垂周壁平直或波纹状。根据细胞垂周壁式样及细胞腔形状划分为3种类型,即:A.细胞腔近狭三角形,具树状分支,垂周壁强烈折曲,壁内多褶皱和空隙,如萹蓄。B.细胞腔近狭长、具树状分支,该类型又分为两个亚型:B1细胞腔形状无规则,垂周壁强烈折曲或波纹状,如春蓼;B2细胞腔形状规则,垂周壁平直,如拳参。C.细胞腔狭小,二叉至四叉分支,垂周壁平直,如篱蓼。果实外果皮解剖学特征对蓼族各属的范围界定及某些存疑种的系统学位置的处理具有重要意义。更多还原

【Abstract】 The anatomical characters of the fruit exocarps of 20 species and 2 varieties of Polygonum and related species from Shandong Province were observed under light microscope.The results showed that the exocarp cells(in cross section) were square(isodia-metric),shortly rectangular,or elongated-rectangular,and aligned in parallel,resembling a palisade;the cell lumens were variable in shape and their sizes depending on cell wall thicke-ning,and may show branches or canals dichotomously or trichotomously or as dendritic ramifications at the outer limit anticlinal branching;the anticlinal walls were undulate or straight.Fruit exocarps were devided into three types based on the anticlinal wall patterns and cell lumen shapes,and they are,A.nearly narrow triangular cell lumen with dendritic ramifications and strongly flexuose anticlinal walls with numerous folds and gaps internally,e.g.Polygonum aviculare;B.nearly long and narrow cell lumen with dendritic ramifications,and were divided into two subtypes,B1 the cell lumens irregular,and anticlinal walls strongly flexuose or waved,e.g.P.persicaria;B2 the cell lumens regular,and anticlinal walls straight,e.g.P.bistorta;C.narrow cell lumen with dichotomous to quadrichotomous ramifications and straight anticlinal walls,e.g.Fallopia dumetorum.The anatomical characteristics have important systematic value to delimitation of the section and treatment of species in dispute within the family Polygonaceae.更多还原