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Molecular Genetic Diversity among Progenitors and Derived Elite Lines of BSSS and BSCB1 Maize Populations

^a Institute of Plant Breeding, Seed Science, and Population Genetics, University of Hohenheim, 70593 Stuttgart, Germany
^b USDA-ARS, Corn Insects and Crop Genetics Research Unit, Department of Agronomy, Iowa State University, Ames, IA 50011
^c EMBRAPA Milho e Sorgo. Caixa Postal 151, Sete Lagoas, MG, Brazil, 35701-970

View larger version (19K): [in a new window]   Fig. 1. Number of alleles detected per RFLP locus at 105 marker loci in progenitors (pBSSS, pBSCB1) and derived elite lines (dBSSS, dBSCB1).

View larger version (23K): [in a new window]   Fig. 2. Histogram of gene diversity (Dl) across all RFLP loci in progenitor (pBSSS, pBSCB1) and derived (dBSSS, dBSCB1) elite lines. Each value along the x axis refers to the upper boundary of the corresponding class interval.

View larger version (23K): [in a new window]   Fig. 3. Allele frequencies versus number of alleles in progenitors and derived elite lines of (A) BSSS and (B) BSCB1. The white columns indicate the number of alleles present in the progenitor lines but not recovered in the derived elite lines. Each value along the x axis refers to the upper boundary of the corresponding class interval.

View larger version (28K): [in a new window]   Fig. 4. Associations among the inbred lines revealed by principal component analysis performed on covariances between allele frequencies calculated from RFLP data of 105 loci. pBSSS and dBSSS lines are designated by solid and open squares, respectively; pBSSS lines originating from Reid Yellow Dent are underlined. pBSCB1 and dBSCB1 lines are indicated by solid and open circles, respectively. Lines derived from advanced cycles are given in italics. PC1 and PC2 are the first and second principal components. The dashed ellipses describe the clustering of the groups.

View larger version (22K): [in a new window]   Fig. 5. Allele frequencies in (A) pBSSS versus pBSCB1 and (B) dBSSS versus dBSCB1.