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Recurrent Mutation and Genome Evolution: Example of Sugary1 and the Origin of Sweet Maize

W.F. Tracy, Dep. of Agronomy, Univ. of Wisconsin, Madison, WI 53706, USA; S.R. Whitt, Raleigh, NC 27695, USA (formerly) USDA-ARS, BASF-Plant Science, RTP, NC 22709, USA (currently); E.S. Buckler, USDA-ARS, Dep. of Plant Breeding & Genetics, Cornell Univ., Ithaca, NY 14853, USA

View larger version (35K): [in this window] [in a new window]   Fig. 1. Distribution of su1 alleles. Alleles are color coded based on (C). (A) The geographic distribution of su1 mutant alleles. Mixed accessions are indicated by split circles. Exact geographic locations for the majority of the northeastern U.S. accessions are unknown. (B) The three su1 amino acid changes projected on Pseudomonas isoamylase crystal structure (Katsuya et al., 1998). (C) Structure of the Su1 gene and position of mutations. A fifth allele, from the Peruvian accessions, is not depicted in this figure.

View larger version (78K): [in this window] [in a new window]   Fig. 2. Alignment of isoamlyases surrounding the three amino acid mutations found in maize su1.