緑色植物における微量要素の生化学 : I 大麦の微量要素欠乏症状とインドール醋酸酸化酵素作用 : 微量要素に関する研究, 第4報

抄録

Barley plants were grown in a series of nutrient solutions in which one of the microelements was eliminated, and the deficiency symptoms and the growth rate were examined. The changes of IAA oxidase activity were estimated on the root tissues of these plants, and the results obtained are summarized as follows : 1) The IAA oxidase activities of each root tissue of iron, manganese, zinc, and boron deficient plants were almost the same as that of the control, although their growth had been depressed. 2) In the copper and molybdenum deficient plants the IAA oxidase activity of the root was very weak, being only 20 and 8% respectively compared with that in the complete nutrients. 3) By the addition of copper to the plants deficient in it, the IAA oxidase activity of their roots was restored almost completely to the level of the control plants within five days, while in the case of molydenum no restoration was recognized. 4) From these results it may be supposed that the IAA oxidase is a copper protein and that molybdenum plays an important role in the synthetic processes of this enzyme. The details of this research is published in English on Tohoku Journal of Agricultural Research, 5,47 (1954) c/o Faculty of Agr., Tohoku University, Sendai.