Abstract
Abstract The interacting effects of NB4, Mg, and K on P nutrition in intact bean plants was studied. The NH4 and Mg treatments increased lateral passage of 32P across the root to the xylem (Centripetal Passage (CP)), while K had no effect. The changes in CP were accurately reflected in accumulation of 32P in the plant top. Centripetal Passage was specifically identified as the site where NH4 and Mg interacted with P. Evidence was given to suggest that these interactions occurred during the initial step of the CP process‐transport across the plasmalemma ‐ rather than in the later stage of symplast transport and trans‐membrane efflux.
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