ミシマサイコ(Bupleurum falcatum)の生育量及びsaikosaponin類の含有率の季節推移(II) : 特に1年目未抽だい株(ロゼット株)について

概要

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Seasonal variations of growth of the 1st year, non-bolting, rosette plants of Bupleurum, falcatum were studied by using the plants monthly collected from August to December in 1994. Variations in the amounts of saikosaponins a, c and d in the main root, lateral root (primary and secondary order lateral root) and rootlet (tertiary and later order lateral root) of these plants were determined. The growth of the shoot reached the maximum in October, and then decreased. Both the maximum diameter and the dry weight of the main root increased from August to October and reached a plateau in November. The dry weight of the lateral roots increased gradually during the entire cultivation period, whereas that of rootlets constituted the major part of the whole root weight from October to December and increased during this period. Lignification of the main root xylem tissues started in September, and hollowing occurred in the central region of the main root xylem in October. The contents of saikosaponins in the main root were all higher in the early stage than in the later stage of cultivation, and were the highest in the cork layer, thus decreased significantly in the tissues outside phloem during cultivation. The contents of saikosaponins in the lateral roots all started increasing significantly in August reaching their maxima in October, whereas in the rootlets, they started decreasing in October.
日本生薬学会の論文
1997-02-20