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Efficient and Inefficient Use of Iron by Two Soybean Genotypes and Their Isolines¹

Iron-efficient ‘Hawkeye’ and iron-inefficient PI-54619-5-1 soybean genotypes and their isolines A62-9 (iron efficient) and A62-10 (iron inefficient) were grown comparatively on soils and solution cultures. There was a differentfal response in the iron-efficient soybeans. A62-9 was less efficient than Hawkeye. This loss in efficiency was related to a loss in the ability of A62-9 to reduce Fe⁺⁺⁺ to Fe⁺⁺ at the root. The four genotypes differed in their ability to reduce iron: Hawkeye > A62-9 > PI 54619-5-1 1 A62-10.

A lowered pH of the growth medium, a concomitant release of reducing substance by the roots, and the subsequent reduction of iron at the root are associated with the absorption and translocation of iron. Translocation of citrate in the stem exudate of the four genotypes relates most nearly to the available iron supply.

Key Words: chelates • phosphate • reducing capacity • translocation • citrate • calcareous soils • acid soil

² Research Soil Scientist, Soil and Water Conservaticn Research Division, ARS, USDA, Beltsville, Maryland; Agrcnomist, Crops Research Division, ARS, USDA, and Professor of Agronomy, Iowa State University, Ames, Iowa; Research Agronomist, Soybean Investigations, Crops Research Division, ARS, USDA, Beltsville, Maryland, respectively.

Received for publication April 12, 1967.

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