Germinal reversion of an unstable mutation for anthocyanin pigmentation in soybean |
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Authors: | R. W. Groose S. M. Schulte R. G. Palmer |
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Affiliation: | (1) USDA-ARS, USA;(2) Departments of Agronomy and Genetics, Iowa State University, 50011 Ames, IA, USA;(3) Present address: Department of Plant, Soil and Insect Sciences, University of Wyoming, University Station, PO Box 3354, 82071 Laramie, WY, USA |
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Abstract: | Summary Plants of the w4-mutable line of soybean [Glycine max (L.) Merr.] are chimeral for anthocyanin pigmentation. Mutable plants produce both near-white and purple flowers, as well as flowers of mutable phenotype with purple sectors on near-white petals. It is established here that the mutable trait is conditioned by an unstable recessive allele of the w4 locus that conditions anthocyanin biosynthesis. The gene symbol w4-m is assigned to the mutable allele. Allele w4-m was derived from a stable, wild-type W4 progenitor allele and reverts at high frequency to a stable, wild-type W4 allele. Reversion occurs both early and late during the development of the germ line. Several experiments give estimates of germinal reversion frequency, indicating that approximately 6% of mutable alleles revert to wild-type from one generation to the next. Allele w4-m exhibits many features typical of an allele controlled by a transposable element. |
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Keywords: | Soybean Glycine max Genetic instability Transposable element Anthocyanin |
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