2.4-Dの植物毒害に關する生理學的研究 : 第I報 2.4-D と KClO_3 との除草に對する共力効果に就て

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In the present experiments, we studied the poisonous actions of 2.4-D on Jerusalem Artichoke and the synergisme by means of the mixed application and the continued spread of 2.4-D and KC1O_3. The single application of 2.4-D as a spray to the foliage of the growing plant induces the following physiological changes within it. (1) The transpiration activity is accelerated soon after the application of the herbicide. (2) The assimilation intensity is reduced. (3) The cell-sap concentration, however, tends lower. (4) The vitamine C contents are much reduced. (5) The resistance to the toxic action of KClO_3 of the foliage sprayed with 2.4-D a few days before gets obviously stronger. This is ascribed to, according to Yamasaki's hypothesis on the harmful effect of KClO_3 upon the plants, that the sprayed foliage with 2.4-D is poor in reducing matters which reduce KClO_3 to KClO, the harmful substance to the plant. The mixed application as a spray of two kinds of herbicides noted above resulted in much quick killing of the plants when compared with the single application of each chemical, thus the "synergisme" being clearly demonstrated. This is partly due to, it is supposed, that 2.4-D injures the upper parts of the sprayed plants, whereas KClO_3 kills the lower parts.
日本作物学会の論文
1951-03-30