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Genetic Distance Based on Simple Sequence Repeats and Heterosis in Tropical Maize Populations

^a Inst. of Plant Breeding, Seed Sci., and Population Genetics, Univ. of Hohenheim, 70593 Stuttgart, Germany
^b Int. Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal 6-641 06600 Mexico D.F., Mexico

View larger version (14K): [in a new window]   Fig. 1. Principal coordinate analysis of the seven tropical maize populations based on modified Roger's distance. PC1, PC2, and PC3 are the first, second, and third principal coordinate, respectively. Heterotic Group A (Pop21, Pop22, and Pool24), Heterotic Group B (Pop25, Pop32), and populations not yet assigned to heterotic groups (Pop29, Pop43) are shown.

View larger version (31K): [in a new window]   Fig. 2. Principal coordinate analysis of individuals from seven tropical maize populations based on modified Roger's distance. PC1 and PC2 are the first and second principal coordinate, respectively. Heterotic Group A (Pop21, Pop22, and Pool24, open squares), Heterotic Group B (Pop25, filled triangles; Pop32, open triangles), and populations not yet assigned to heterotic groups (Pop29, open diamonds; Pop43, filled diamonds) are shown.

View larger version (22K): [in a new window]   Fig. 3. Relationship between squared Roger's distance (MRD2) and panmictic midparent heterosis (PMPH) for grain yield, plant height, and days to silking. Intrapool crosses within Heterotic Group A (filled squares) and Group B (filled triangles), interpool crosses between A and B (*), and miscellaneous (open diamonds) are shown. 1 = Pool24, 2 = Pop21, 3 = Pop22, 4 = Pop25, 5 = Pop29, 6 = Pop32, 7 = Pop43; r is the correlation coefficient and b the slope coefficient.