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Extent and Distribution of Genetic Variation in U.S. Maize

Historically Important Lines and Their Open-Pollinated Dent and Flint Progenitors

^a Pioneer Hi-Bred International, Inc., Johnston, IA 50131
^b Institute for Genomic Diversity, Cornell Univ., Ithaca, NY, 14853-2703
^c Dep. of Agronomy, Iowa State Univ., Ames, IA 5011-1010

View larger version (26K): [in a new window]   Fig. 1. Mean levels of genetic variation in Northern Flint (NF), Southern Dent (SD), Corn Belt Dent (CBD), and inbred lines at 43 simple sequence repeat (SSR) loci: (a) allele number, (b) expected heterozygosity, and (c) inbreeding coefficient. Circle = NF/SD; diamond = CBD; x = inbred. The simple sequence repeat (SSR) loci are listed in chromosomal order and their numbers can be associated with the SSR locus in Table 3.

View larger version (36K): [in a new window]   Fig. 2. Principal components analysis of 106 Corn Belt Dent populations using data for (a) all 710 alleles observed at 43 simple sequence repeat (SSR) loci and (b) the most common allele at each of 43 SSR loci. Blue: Northern Flints; black: Southern Dents; red: Corn Belt Dents; green: inbreds.