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Yasunori Yoshida,Harumi Takahashi,Hiroomi Kanda,Kazunori Okuyama,Kota Sato,Koki Kanahama 한국원예학회 2010 Horticulture, Environment, and Biotechnology Vol.51 No.1
The effects of different gibberellin A3 (GA) concentrations on the development of main shoots and aerial and new tubers in the Japanese yam were examined in an unheated plastic house and open field. In the unheated plastic house, treatment with GA 25 (25 ㎎ · L?¹) or GA 200 (200 ㎎ · L?¹) promoted new tuber growth in the plants by inhibiting aerial tuber growth. Plants treated with GA 100 (100 ㎎ · L?¹) had the greatest fresh weight of new tubers among all GA treated plants. These effective GA concentrations showed similar results in Dioscorea oppositifolia ‘Ichoimo’ and ‘Nagaimo’ that were grown in the unheated plastic house. In the open field, although treatment with GA 25, GA 50 and GA100 promoted new tuber growth by inhibiting aerial tuber growth, the yield of new tubers decreased with increasing GA concentration. Furthermore, although GA inhibited aerial tuber growth, the fresh weight of new tubers after GA 200 treatment was almost equal to that of the GA 0- treated plants. The different effects of GA concentrations under unheated plastic house and open field conditions were due to the negative influence of GA treatment (it decreased the number of leaves on the shoots). In fact, the number of leaves on the shoots of plants grown in the unheated plastic house was significantly lower among GA 25-and GA 200-treated plants than those of GA 0-treated plants. This implies that GA had a negative effect on plants grown in the open field.