The Absorption and Translocation of Iron

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Abstract
The Fe salt used in a nutrient medium exerts a great effect on the association of Fe with the root of the Red Kidney bean plant, but no correlation was found between precipitation rate of an Fe compound in a nutrient soln. and its accumulation in the aerial portions or on the roots. However, as the nutrient concn. of Fe is increased, the uptake increases but an increase in pH decreases Fe absorption. The absorption of Fe was found greatest at equimolar concn. of Fe and P. The amt. of Fe associated with the roots may be greatest at equimolar concn. but may also continue to increase with decreasing P concn. presumably depending on the participate nature of the Fe. The distr. of Fe in the healthy bean plant is quite uniform but under certain conditions of high P, Fe may accumulate in the leaf veins giving rise to a P-induced chlorosis. The translocation of Fe as detd. by leaf injn. and subsequent radioautographs is greatest under nutrient conditions of low P, low Fe and low pH. Translocation is least under conditions of high P, high Fe and high pH with intermediate conditions of the sums of all factors yielding intermediate conditions of the sums of all factors yielding intermediate conditions of Fe mobility.

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