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This article in SSSAJ

  1. Vol. 34 No. 2, p. 249-252
    Received: Sept 17, 1969
    Accepted: Oct 24, 1969

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Further Characterization of Iron Uptake in Two Genotypes of Corn1

  1. J. C. Brown and
  2. J. E. Ambler2



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.

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