IRON CHLOROSIS IN SOYBEANS AS RELATED TO THE GENOTYPE OF ROOTSTOCK

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Abstract
[long dash]The incorporation of photosynthetic C14 into the organic acids of Fe-inefficient and Fe-efficient soybean genotypes was used as an index to an altered metabolism caused by P or Fe. Fe-efficient soybeans were more tolerant to relatively high concentrations of phosphate than Fe-inefficient soybeans. Phosphate decreased the incorporation of C14 into the organic acids of both genotypes, but much more in the Fe-inefficient than the Fe-efficient soybeans. Adding Fe to the prenutrient solution augmented the effect of phosphate. Citric and transaconitic acids were the principal organic acids involved.