Abstract
By the research on the mechanism of the inhibitory action of fusarinic acid on the plant-growth the following conclusions have been reached.
1. The inhibitory action of fusarinic acid ultimately bases on the chelation mechanism, namely in the plant tissue fusarinic acid hinders the Fe-porphyrin oxidase system catching tightly the heavy metal ions (Fe+++, Cu++, etc.), which participate in the formation of this oxidase system, and subsequantly results the check of the plant-respiration.
2. The n-butyl side chain of fusarinic acid contributes to the chelation intensity of this acid exercising the “-Inductive Effect” and subsequently to the intensity of the growth-inhibitory action on plants.
3. Further the plant growth-inhibitory action of α-picoline-γ-car-boxylic acid, which having once been isolated by Schreiner and Shorey from the soil of barren land in Takoma district, North America, has also been proved to be ultimately based on the chelation mechanism in the same way with that of fusarinic acid.
