Allelopathic compounds released by invasive alien plants can suppress the growth of plants in their vicinity. The aim of this study was to investigate changes in tissue and cell structure in roots of radish seedlings treated with 10% aqueous extracts of rhizomes from the invasive knotweeds Fallopia japonica and F. ×bohemica. After 7 days of growth without and with aqueous extracts from these rhizomes, the anatomical and ultrastructural changes in the radish seedling roots were analyzed with light and transmission electron microscopy, and hydrogen peroxide was localized with diaminobenzidine, to define oxidative stress. The roots of radish seedlings treated with the knotweed extracts were shorter and thicker, due to the shorter and wider shapes of their cortex cells, which were organized in more columns than the control roots. There were signs of cell damage and oxidative stress in the root cap cells, and to a lesser extent in the meristematic zone. As well as the irregularly shaped nuclei and plasma membrane detached from the cell wall, the most prominent ultrastructural effects in the root cap cells of these aqueous rhizome extracts were the ring-shaped form of the mitochondria and large endoplasmic reticulum bodies. Excessive vacuolization was seen for the cells of the root apical meristem.

外来入侵植物释放的化感化合物可以抑制其附近植物的生长。本研究的目的是研究用 10% 入侵虎杖根茎水提取物处理的萝卜幼苗根部组织和细胞结构的变化Fallopia japonica和F. ×波西米亚. 在没有和有来自这些根茎的水提取物的情况下生长 7 天后，用光和透射电子显微镜分析萝卜幼苗根部的解剖学和超微结构变化，并用二氨基联苯胺对过氧化氢进行定位，以确定氧化应激。用虎杖提取物处理的萝卜幼苗的根更短更粗，因为它们的皮层细胞的形状更短更宽，比对照根组织成更多的列。根冠细胞中存在细胞损伤和氧化应激的迹象，分生区的程度较轻。以及从细胞壁上脱落的不规则形状的细胞核和质膜，这些水性根茎提取物的根冠细胞中最显着的超微结构效应是线粒体和大内质网体的环状形式。根尖分生组织细胞出现过度空泡化。