【摘要】 凤眼莲(Eichhornia crassipes Solms)在我国南北各地分佈都很普遍;又因为此种植物具有浮水生的根系,因此常常用其根尖部分作为教学上的观察材料。但也有的误认为其根尖的生长点,系包含有四群的原始细胞,并认为与其他一些很少数的水生植物,如水浮莲,马尿花等的根尖,系属同一类型。现经重新观察,证明其根尖的结构却与禾本科植物(如玉米)的根尖相似,亦只具有三层原始细胞。所以认为此种根尖系具有四群原始细胞,可能由于制作连续切片时,未能纵切正中,完全的显出单层的表皮皮层原细胞的缘故。更多还原

【Abstract】 Eichhornia crassipes Solms is a common water plant widely distributed in China. The floating roots of which are often used as a laboratory material for demonstrating the growing point in the root. It has been erroneously considered by some anatomists that the root-tip contains four separate groups of initials which subsequently differentiate into four zones: root-cap, epidermis, cortex and stele. After careful re-examination, it is found that the root-tip contains only three groups of initials: calyptrogen, epidermo-cortical initials and plerome, and the auther agrees with the early workers who related this plant to the type of most Gramineae plants (e. g. Zea mays). The misrepresentation obviously arises from the fault that the sections were not strictly median.更多还原