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Effect of seed coat color mutations on soybean plant and seed composition

Alfredo Lam-Sánchez^I; José Fernando Durigan^I; Gilberto J. Padovan^IIShirley Aparecida Ferres Sato^I; Monica Maia de Stefani^I; José Eduardo Dutra de Oliveira^II

^IDepartamento de Fitotecnia e Tecnologia, Faculdade de Ciências Agrárias e Veterinárias, UNESP, 14870 Jaboticabal, SP, Brasil. Send correspondence to A.L.-S.
^IIDepartamento de Clínica Médica e Centro Interdepartamental de Química de Proteínas, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, 14049 Ribeirão Preto, SP, Brasil

ABSTRACT

Modifications in seedcoat color, whereby gene iⁱ is changed to its alternative form i, frequently occur in soybeans (Glycine max (L) Merrill). Ten commercially grown soybean cultivars were compared to their respective seedcoat color mutants (isolines) for agronomic traits and seed composition (protein, oil and amino acid content). Significant differences were detected between normal and mutant isolines only for pods per plant and oil content. Differences in amino acid content were greater for all amino acids except histidine. Cultivar `Davis' had differences in all 16 amino acids when compared to its isoline. Chemical scores for sulfur-containing amino acids ranged from 66.0 to 95.3, with valine tending to be a limiting amino acid (scores from 49.9 to 81.1). We conclude that seed color mutants can be grown commercially using the same production practices as used for normal isolines, with better acceptance by the population because of color preference.

Keywords: seed; coat; color; mutations; soybean; composition.

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