稲体の2,4-Dによる開張と倒伏抵抗力の考察

概要

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This experiment was undertaken with the purpose of clarifying the expansinn of tillering attitude and the lodging resistance of rice plant caused by 2,4-D treatment. The results obtained may be summarized as follows. Rice plant treated by 2,4-D expressed the expansion of tillering posture under daylight, but did not show it under interception of light. 2,4-D caused an increased content of glucoce and starch in culm, leaf sheath, and spikelets, especially in culm base indicating a promoted distribution of glucose and starch to culm with a consequent decrease in the distribution to spikelets as observed at 30 days after heading. The dry weight of culm base and breaking strength of it are also increased by 2,4-D. These changes of culm base property were more remarkable when 2,4-D was applied under the condition in which culm base was intercepted to light and was closedby a hemp cord not to make culm base open, but the degree of changes of culm property, caused by the artificial expansion of tillerng attitude, was less than 2,4-D treatment except the increase of breaking strength in culm, base. From these results, we concluded that the effect of 2,4-D in increasing culm strength and lodging resistance is not primarily due to the expansion of plant attitude but to the specific function of 2,4-D.
日本作物学会の論文
1962-12-30