Abstract
We examined the iron-deficiency response on hairy root and intact plant. We used the cucumber (Cucumis sativus L. cv.) for test plant. Both hairy root and intact plant root secreted riboflavin as a result of iron deficiency. Therefore, there was a negative correlation between riboflavin secretion and iron content in plant. After we confirmed that riboflavin did not dissolve Fe_2O_3, we also examined the dissolution of Fe_2O_3 by the hairy root. The hairy root dissolved Fe_2O_3. Iron-deficiency hairy root had higher ability to dissolve Fe_2O_3 than iron-sufficient hairy root. From the above results, we considered the dissolvable functions of water-insoluble ferric compounds are induced by iron deficiency and exist in the root.
