サントニン含有Artemisia属植物の研究特にその栽培について (第7報)

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1) The seed setting of Artemisia kurramensis QAZ. is considered to require adequate dryness and temperature rather than the short day effect. It was found that although the plant did not bear seeds in the open air field in this area (Kasukabe, Saitama Pref.), seeds could be obtained by culture in a green house (Table I).2) Cutting was found to be the best in December and woody twigs were found to be better than herbaceous shoots for the cuttings. It was found that immersion of the cuttings for 24 hours in 5, 000-50, 000 diluted solution of potassium α-naphthaleneacetate or β-indoleacetate was quite effective in acceleration of rooting (Table II).3) Santonin content of Artemisia kurramensis, sown in March, 1954, was followed in 10-day intervals from August 2, 1954, to October 12, 1955 (Table III and Fig. 1). The maximum content during the first year growth was in the latter part of August (1.41%), the content decreased gradually, and became nil during the latter part of February to the beginning of April. The santonin content increased suddenly from the middle of April to reach the maximum in the second year growth during the middle of July (2.33%), and decreased thereafter. The annual variation of santonin content seems to go parallel with the vegetative growth of the plant.4) The santonin content of third, fourth, fifth, and sixth year growths was examined and they were all similar to that of the second year growth (Table IV).5) Individual santonin content in the third year growths was determined on the same individuals whose santonin content was determined in the previous year (Table V). There was a significant positive correlation of santonin content between the second and third year growths and it was considered that the amount of santonin produced by the plant is hereditary. From such results, plant breeding of Artemisia kurramensis by family selection was started.