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Tolerance of Soybean Cultivars to Manganese Toxicity¹

The reasons for differences in tolerance to manganese toxicity among four cultivars of soybeans [Glycine max (L.) Merr.] were studied in solution culture using grafting, chemical analyses, and dry matter yield changes. Yield data and visual symptoms indicated considerable variation between cultivars with ‘Lee’ being the most tolerant and ‘Bragg’ the most sensitive. Leaf crinkle was the most prominent visual symptom of toxicity observed. Chemical analyses revealed little variation between cultivars in uptake of maganese or in distribution of manganese between root and shoot. Grafting of Bragg scions onto Lee rootstocks revealed that genotype of rootstocks had little or no control over tolerance or susceptibility to high (15 ppm) manganese in solution culture.

Key Words: Glycine max (L.) Merr. • Rootstock genotype • Grafting • Solution culture

² Graduate student and associate professor in agronomy.

Received for publication August 1, 1975.

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