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Further Characterization of Iron Uptake in Two Genotypes of Corn¹

ABSTRACT

Two genotypes of corn, (Zea mays L.) homozygous yellow stripe ys₁/ys₁ (Fe-inefficient) and Pa 54 (Fe-efficient), were grown in nutrient solution with two levels of CaCO₃ using two plant populations. The nutrient solution and plant population were varied to evaluate and compare the two genotypes relative to modifications in their growth medium favorable to Fe transport. Plant factors recognized as favoring Fe transport were (i) ability of roots to lower the pH of their growth medium, (ii) efflux of material by the root that reduces Fe³⁺ to Fe²⁺, (iii) increase of citrate in root sap, and (iv) decrease of P in root sap. The Fe-efficient Pa 54 corn was more efficient than the yellow stripe ys₁ in all of the above factors and transported more Fe to leaves than ys₁. Once the iron requirement of the plant had been satisfied, the activity of the factors favoring Fe transport diminished and less Fe was taken up by the plant.

¹ Contribution from the Mineral Nutrition Laboratory, Soil and Water Conservation Research Division, ARS, USDA, Beltsville, Md.

² Soil Scientist and Plant Physiologist, respectively.

Received for publication September 17, 1969. Accepted for publication October 24, 1969.