Associations among widely used French and U.S. maize hybrids as revealed by restriction fragment length polymorphisms |
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| Authors: | J S C Smith O S Smith S J Wall |
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| Institution: | (1) Plant Breeding Division, Pioneer Hi-Bred International, Inc., 7250 NW 62nd Avenue, P.O. Box 1004, 50131 Johnston, IA, USA |
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| Abstract: | Summary Eighty DNA Restriction Fragment Length Polymorphism (RFLP) clones were used as probes to profile 47 hybrids of maize (Zea mays L.) that are of widespread usage in France and 49 hybrids that are either in common usage or are new releases in the U.S. The objectives were to 1) investigate the degree to which RFLPs provide unique characterization of hybrids; 2) show associations among hybrids using both cluster and principal coordinate analyses; 3) measure the ability of RFLPs to show associations among hybrids that reflect those to be expected on the basis of pedigree; and 4) compare the patterns and extent of genetic diversity among French hybrids with that found among a set of widely used U.S. hybrids.RFLPs showed all French hybrids to have different profiles, however, 3 hybrids were very similar with more than 90% of their profiles in common. Twenty-seven U.S. hybrids showed this level of similarity with one or more U.S. hybrids. High correlations (r=0.93, 0.94) were found for pedigree distance versus RFLP distance between pairs of French and of French and U.S. hybrids, respectively. Similar levels of correspondence for rank correlations between RFLP and pedigree data were also found. Similar groupings of hybrids were shown by two cluster analysis methods and by principal coordinate analysis. Inclusion of hybrids in cluster groupings was supported by observation of raw distance data for selected hybrids and their nearest neighbors. Most hectarage in France is planted to hybrids that fall within 2 related groups of germplasm on the basis of RFLP data. Minimum distance standards could promote breeders to surmount the challenge of introducing elite yet diverse germplasm into agriculture. |
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| Keywords: | cultivar identification electrophoresis genetic diversity minimum distance DNA RFLPs Zea mays L |
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