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Genetic Diversity Determined within and among CIMMYT Maize Populations of Tropical, Subtropical, and Temperate Germplasm by SSR Markers

^a Institute of Plant Breeding, Seed Science, and Population Genetics, Univ. of Hohenheim, 70593 Stuttgart, Germany
^b Crop Science Dep., Univ. of Illinois, 1102 South Goodwin Avenue, Urbana, IL 61801
^c International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal 6-641 06600 Mexico D.F., Mexico
^d Institute of Crop Breeding and Cultivation, Chinese Academy of Agric. Sciences, Zhongguancun South Street 12, 100081, Beijing, China

View larger version (41K): [in a new window]   Fig. 1. Frequency of loci with significant (P 0.01) Hardy-Weinberg equilibrium tests in the 23 CIMMYT maize populations.

View larger version (19K): [in a new window]   Fig. 2. Principal coordinate analysis of the 23 maize populations based on modified Roger's distance calculated from the allele frequencies of the populations. PC1 and PC2 are the first and second principal coordinates, respectively. Tropical (), subtropical intermediate-maturity (*), subtropical early-maturity (•), and temperate germplasm ().

View larger version (42K): [in a new window]   Fig. 3. Principal coordinate analyses of the individuals of the 23 populations grouped into four megaenvironments (ME) based on modified Roger's distance. PC1 and PC2 are the first and second principal coordinate, respectively, and numbers in parentheses refer to the proportion of variance explained by the principal component in the specific ME group.