中国におけるウラルカンゾウ(Glycyrrhiza uralensis)の栽培研究(第1報) : 地上部切除処理がグリチルリチン酸含量に及ぼす影響

概要

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Anew method with a shorter growing period of only one year and three months which could apply to actual licorice production for medicinal use was developed. In order to shorten the cultivation period of licorice and to increase the glycyrrhizin content, we conducted the seasonal variation test and the stem cutting test during the second year cultivation in a field of production scale. Cutting twice in early summer induced a significantly higher content (3.49%) compared with all of contents in the seasonal variation test. The contents of all 12 plots in the stem cutting test exceeded the minimum requirement (2.50%) described in the Japanese Pharmacopoeia, which indicated that stem cutting in the vigorously growing season is highly effective to make the content higher and more stable. After cutting, new buds immediately sprouted and stems extended very fast. Rapid shoot growth suppressed the excessive consumption of starch resulting in an increase in the content of glycyrrhizin as a relative effect. In addition, the stem cutting test showed rather high yields of dried root of more than 120kg/10a.
2012-08-20