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Many crude drugs used in Kampo medicines in Japan represent untapped medicinal resources. Domestication of the wild plants from which these drugs are derived and preservation of their natural habitats... are necessary for establishing a stable supply of Kampo medicines. Here, we investigated the influence of the moisture condition of root medium on the growth of Pinellia ternata Breit. by using a subirrigation solid substrate culture system. The moisture condition was controlled by maintaining a constant ground water level (GWL). Plants were grown for 15 weeks under a GWL of either 4 cm (GWL-4) or 8 cm (GWL-8) below the corm base in a phytotron glass room at 25°C and 70% relative humidity. The water content of the root media around the corm in GWL-4 was only 1% higher than that in GWL-8. However, water content apparently affected corm enlargement and the development of new bulbils. Relative yield of the corm per plant, compared with the initial weight, was ～400% in GWL-4 and ～200% in GWL-8. The number of bulbils produced in a plant was 13.5 in GWL-4 and 4.4 in GWL-8. The effective ingredient, a kind of water-soluble polysaccharide consisting mainly of arabinose, was about 10% higher in GWL-8 corms than in GWL-4 corms. Moreover, when comparing the two conditions, the relative difference in corm yield was remarkably larger than that observed for the effective ingredient content. Overall, productivity was considered to be higher in GWL-4 than in GWL-8.続きを見る
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