Studies on Structure and Accumulation of Main Chemical Constituents of Aster tataricus L. f. Roots

Abstract:

In order to reveal structure, accumulation parts and contents of chemical constituents in Aster tataricus L. f. roots, the root structure at different developmental stages were observed by paraffin section, the accumulation parts of triterpenoid saponins and flavonoids were located by histochemistry, and the their contents were determined by HPLC. The results showed that the primary root of A. tataricus could be divided into epidermis, cortex and stele, and the secondary root included exodermis, cortex and vascular tissue. The secrete channels located inside the cortex, which number was consistent with the phloem bundles. The center of root differentiated the pith with the root thickening. Triterpenoid saponins were mainly distributed in phloem and interior cortex, while flavonoids were in cortex and pith. The content of shionone in lower part of root was more than that in upper, but the contents of quercetin and kaempferol in lower part were only one-third of those in upper. Therefore, it was suggested that the lower root would retain in processing for comprehensive utilization of the resources.