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Inheritance of Tolerance to High Manganese Supply in Soybeans¹

Soybean [Glycine max (L.) Merr.] cultivars show differential tolerance to high manganese (Mn) supply levels as evidenced by severity of symptoms and reductions in yield. Crosses of the tolerant cv. ‘Lee’ with a susceptible cv. ‘Bragg’ gave F₁ plants with only moderate Mn toxicity symptoms and the F₂ generation showed a continuous distribution in symptoms that was skewed towards tolerance. The F₆ progeny from a cross of ‘Amredo’ (tolerant) and Bragg (susceptible) had a bimodal distribution. Tolerance to high Mn levels is an inherited character.

Key Words: Soybean • Glycine max (L.) Merr • Manganese toxicity • Cultivar tolerance • Breeding • Heritability

² Former graduate student (presently research agronomist, Yanco Research Centre, Vanco, N.S.W. 270S, Australia), lecturer and associate professor (presently assistant principal, Hawkesbury Agric. College, Richmond, N.S.W. 2753, Australia) of Dep. of Agronomy and Horticulture Science, Univ. of Sydney, N.S.W. 2006, Australia.

Received for publication June 2, 1980.