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《Journal of Northwest University(Natural Science Edition)》 1984-04
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Anomalous Secondary Structures in the Roots of Medicinal Plants

Zhang Hong and Hu Zhenghai (Department of Biology)  
The present paper reports the laws of anomalous secondary structures in medicinal plant roots of 4 species. In the root tuber of Polygonum multiflorum, there is a ring of abnormal vascular bundles which are variable in size. It scatters in the parenchyma around the normal stele. Outside the stele in the fleshy tap root of Phytolacca acinosa, there are abnormal vascular bundles arranging in more than 5 concentric rings and parenchymatous conjuctive tissues between them. The 2 kinds of roots discribed above possess abundant parenchymas within their abnormal vascular bundles as well as between them so as to adapt for their storage functions. In the tap and lateral roots of Achyranthes bidentata and Cyathula officinalis, there are also more than 4 rings of abnormal vascular bundles outsite their steles, but the arranging form of the bundles and the degree of lignification in radial conjuctive tissues are obviously different from each other. The parenchymas in both species roots, which do not belong to fleshy ones, are not developed. There are not any starch grains in there parenchymatous cells. The anomalnus structures are only the conservative characters in their phylogenies. These 4 medicinal plant roots all belong to the important chinese drugs. The elucidation of the laws in their structures provides some bases for cultivating these plants and identifying their medicinal parts with microscopy.
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