A study concerning the relationship of dynamic accumulation of triterpenoid saponins and anatomical characteristics of Achyranthes bidentata Bl roots was undertaken by anatomical, histochemical and phytochemical method respectively. Results revealed that the primary and secondary structures of the root resembled those of usual dicots. The continual thickening growth of root principally resulted from the differentiation and development of the tertiary structure. The first ring of supernumerary cambium originated from the parenchyma and vascular ray cells of secondary phloem and each of the followed rings initiated in the outmost foundamental parenchyma cells which were derived from the immediate preceding ring. In the supernumerary cambiums, there had not distinction between the fusiform initial and the ray initial. Its cells present stratifide arranged from a longitudinal section through root. Regular and concentric rings of tertiary vascular bundles who differentiate centrifugally were enclosed by the connective parenchyma. The number of the rings continually increase with the development of the root itself. Triterpenoid saponins accumulated mainly in pericycle, primary phloem and parenchyma between primary phloem and xylem in the primary structure of root but came into existence in cells of secondary phloem and phelloderm with secondary structure development of root, and as well as in supernumerary cambium and phloem of tertiary vascular bundle after the tertiary structure maturated gradually in the roots. The investigation provides indications that the tertiary structure were not only main parts in the roots of Achyranthes bidentata Bl, but also important storage region of triterpenoid saponins in its growth and development. In addition, the analysis of using the HPLC showed that dynamic increasing trend oleanolic acid was as "S" curve during the roots growth and development and up to the highest content of triterpenoid saponins after plants grew 120 days. Meanwhile, the number of the rings of tertiary vascular bundles, length and diameter of the roots were the same as the triterpenoid saponins increasing trend. It should be optimal season for harvest.
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