Anatomical Studies on the Vegetative Organs and Transition Vascular System of Phytolacca Americana Seedling

An anatomical study was conducted on the vegetative organ of Phytolacca Americana by the common plant paraffin section.The results showed that the seedling type of Phytolacca Americana was Magnolia Type.The root was diarch,which consisted of epidermis,cortex and stele.The stem consisted of epidermis,cortex and vascular cylinder.The vascular cylinder contained vascular bundle,pith and pith ray.The differentiation of cotyledon mesophyll was not obvious,however,the palisade tissue and the spongy tissue of primary leaf was well-developed.Transition vascular system wasroot-hypocotyl-cotyledon form and the transition zone was formed in the base of the hypocotyl.