Abstract
Ipecac plants, Cephaelis ipecacuanha A. Richard, were clonally propagated through shoot-tip culture and field-cultivated at Tsukuba (Lat. 36°N, Long. 140°E) and Tanegashima (Lat. 30°30′N, Long. 131°E) in Japan. Growth and alkaloid content were periodically measured, and influence of environmental conditions was investigated. In Tanegashima, plants grew gradually from June to October, showing homogeneous growth of aerial parts. However the aerial parts were significantly damaged between January and February when minimum average monthly temperature was below 10 °C. In Tsukuba, the plants did not grow well, but the aerial parts were alive until October. The alkaloid contents in the roots increased from June to December in Tanegashima, while in Tsukuba they decreased once in September and October. The maximum alkaloid content in the roots was observed in December, both in Tsukuba (2.4 % DM cephaeline, 1.0 % DM emetine) and Tanegashima (3.2 % DM cephaeline, 1.8 % DM emetine).
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