水稲の分蘖順位による2.4-D 及び KClO₃に対する抗毒性に就いて

抄録

The toxic action of 2.4-D and that of potassium chlorate on rice plants were studied. Tillers cut from rice plants about 62 days and 72 days old were treated with 0.5% solution of 2.4-D and 0.1% solution of potassium chlorate. The results were as follows : 1. The toxic action of 2.4-D was stronger on the tillers of lower orders, and weaker on the tillers of higher order. 2. On the contrary, the toxic acion of KClO₃ was stronger on the higher order tillers. The mechanism of the toxic action of 2.4-D was ascribed to the carbohydrate dissipation in the plant, that of KClO₃ to the physiological reduction of it in the plant body.