Genetic characterization of Northern Flints and Flours maize (Zea mays L. spp. mays) with isozyme, SSR, and morphological markers

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González Ugalde, William
Major Professor
Peter K. Bretting
Michael Lee
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The Department of Agronomy seeks to teach the study of the farm-field, its crops, and its science and management. It originally consisted of three sub-departments to do this: Soils, Farm-Crops, and Agricultural Engineering (which became its own department in 1907). Today, the department teaches crop sciences and breeding, soil sciences, meteorology, agroecology, and biotechnology.

The Department of Agronomy was formed in 1902. From 1917 to 1935 it was known as the Department of Farm Crops and Soils.

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  • Department of Farm Crops and Soils (1917–1935)

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The Northern Flints and Flours (NF), one of the more important races for maize breeders and scientists, is one of the progenitors of Corn Belt Dents (CB). Despite its importance this race is not well-characterized. Therefore, an assessment of the utility of different methods for genetic characterization of the NF was conducted. Genetic variation in 40 representative germplasm accessions of the racial groups NF, CB, and Southern Dents (SD), maize from the southwestern US and northern Mexico, and maize intermediate between the NF and the other groups, were evaluated with morphological, isozyme and SSR markers. SSR loci proved to be powerful genetic markers for studying genetic diversity and divergence in maize.;As assessed by gene diversity statistics, SSR were more polymorphic (>H[subscript u])1 with more alleles per locus (>A), and a higher proportion of polymorphic loci (>P[subscript 95%]) than isozyme markers in maize. The degree of inter-accessional and inter-racial differentiation in NF strongly support its recognition as a distinct race. The NF are characterized by a high degree of inter-accessional differentiation. The racial groups studied herein differed primarily by the frequencies of the most common isozyme and SSR alleles, rather than by diagnostic unique or rare alleles. Patterns of isozyme and SSR allelic content and phenetic analysis of marker data indicated that NF and SD are extraordinary divergent inter se.;Phenetic analyses of joint morphological, isozyme, SSR data sets yielded results more congruent with the history of these races and previous studies. Distributional patterns of isozyme and SSR alleles, results of independent phenetic analyses of morphology, isozymes, and SSRs and joint analyses support Galinat and Gunnerson's (1963) hypothesis that NF originated from northwestern Mexico maize that diffused through the southwestern US to the northeastern US.

Wed Jan 01 00:00:00 UTC 1997