DIFFERENTIAL UPTAKE OF FE AND CA BY TWO CORN GENOTYPES

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Abstract
Iron-inefficient [Yellow-stripe-1 (ys1/ys1)] and iron-efficient (Pa 54) corn showed a differential response when grown on the calcareous Millville soil or the limed Bladen soil (pH 5.0). The ys1/ys1 mutant developed iron-deficiency symptoms on both soils, whereas Pa 54 developed no iron chlorosis on either soil. Both plants developed iron chlorosis when grown on the calcareous Tripp soil. The ysi/ysi mutant can be classed with "acid soil plants." Iron def iciency is accentuated by PO4 and 2 corn genotypes differentially absorb and translocate PO4 from organic PO4, a factor that may be associated with the utilization of Fe. The 2 corn genotypes showed a differential uptake of Fe from a Cu-defi-cient Bladen soil (pH 5.0). The addition of Cu to the soil decreased the absorption and translocation of Fe much more in Pa 54 than in the ys1/ys1 corn. The factor affected by Cu appears to be a point of interest that varies differentially in the 2 corn genotypes. As Cu decreased the absorption and translocation of Fe, it enhanced the distribution of Ca into the top leaves, preventing the twisted and necrotic areas of the leaf often associated or referred to as a Cu-deficiency symptom.