Reversible Effects of Boron on the Absorption and Incorporation of Phosphate in Vicia Fabal.

Summary Boron deficiency reduced absorption of phosphate in whole plants and root segments of Vicia faba. The overall phosphate metabolism of the whole root was unaffected but both the equilibrium pattern and initial rates of esterification were altered in the root tip region. The equilibrium ratio of inorganic phosphate to organic phosphate was not affected. Addition of boron at 10 μM to the deficient plants for 1‐2 h prior to absorption reversed the effects of boron deficiency in both absorption and metabolism of phosphate although it did not stimulate the initial rates of esterification of the absorbed phosphate.