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Organic Acids of Maize (Zea mays L.) as Influenced by Mineral Deficiencies¹

Krebs cycle acids of young corn leaves have been related to K, P, Ca, Mg, S, Fe, Mn, B, Cu, and Zn deficiencies. The total organic acid content of all the mineraldeficient leaves was higher than that of nondeficient leaves. The predominant acid in nondeficient leaves was t-aconitate. The greatest organic acid changes were noted for K-, Ca-, Mg-, and P-deficlent leaves, where t-aconitate decreased and malate and citrate increased. Potassiumdeficient leaves exhibited the most pronounced change where t-aconitate decreased fourfold with a simultaneous fourfold increase of malate and citrate. Proportional changes were not observed for the other nutrient-deficiencies.

Key Words: Krebs cycle acids • transaconitic acid • malic acid • citric acid • mineral content

² Research Chemist, Crops Research Division, ARS, USDA, Wooster, Ohio 44691.