商陆与垂序商陆营养器官的解剖学研究

采用常规植物石蜡制片手段对商陆与垂序商陆营养器官进行了形态解剖学研究。结果表明:二者的解剖结构基本相同,但也存在一定差异。商陆根中央维管束排列成蝴蝶结状,垂序商陆维管束散射状排列,髓射线明显;商陆与垂序商陆茎都由表皮、皮层、维管柱组成,商陆髓部所占茎横切面的比例较垂序商陆小,皮层薄壁细胞层数较多,垂序商陆皮层薄壁细胞仅4～6层;商陆与垂序商陆叶的结构基本类似,均为异面叶,但叶片厚度、栅栏组织细胞和海绵组织细胞大小以及气孔密度存在差异。

Anatomical Studies on the Vegetative Organs of Phytolacca acinosa Roxb.and Ph.americana L.

An anatomical study was conducted on the vegetative organ of Phytolacca acinosa Roxb.and Ph.americana L.using the plant paraffin section.The results showed that both anatomical structures were basically the same in exception of little differences.The central bundle of Ph.acinosa Roxb.root was arranged into a bow shape,however that of Ph.americana L.root was the scattering shape,and medullary ray were obvious.Both stem consisted of epidermis,cortes and central cylinder.The pith of Ph.acinosa Roxb.was smaller,and its cortical parenchyma cells was multilayer.The cortical parenchyma cells of Ph.americana L.was only 4 to 6 layers.The leaf structures of Ph.acinosa Roxb.and Ph.americana L.were essentially similar,and both were bifacial leaf.However,leaf thickness,cell size of palisade tissue and spongy tissue,as well as stomatal density diversified between the two species.