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Identification of Essentially Derived Varieties Obtained from Biparental Crosses of Homozygous Lines

II. Morphological Distances and Heterosis in Comparison with Simple Sequence Repeat and Amplified Fragment Length Polymorphism Data in Maize

^a Institute of Plant Breeding, Seed Science, and Population Genetics, Univ. of Hohenheim, 70593 Stuttgart, Germany
^b Crop Science Dep., Univ. of Illinois, S-110 Turner Hall, 1102 South Goodwin Avenue, Urbana, IL 61801

View larger version (41K): [in a new window]   Fig. 1. Relationship of coancestry coefficient (f) with (A) Euclidean and (B) Mahalanobis distances based on 25 morphological traits observed for 1767 pairwise comparisons of maize inbred lines.

View larger version (35K): [in a new window]   Fig. 2. Relationship of genetic distances based on 100 simple sequence repeats (GDSSR) or 20 AFLP primer combinations (GDAFLP) with midparent heterosis of 84 intrapool hybrids with given pedigree relationships of their parental maize lines.

View larger version (61K): [in a new window]   Fig. 3. Cumulative histograms (columns) and approximated normal distributions (curves) for (A) Euclidean or (B) Mahalanobis morphological distances based on 25 morphological traits for F2–, BC1–, and BC2–derived progeny lines. Variables n, µ, and SD refer to the number of values, the mean, and the standard deviation of Mahalanobis distance values for the particular distribution, respectively.