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Tropical maize germplasm: what can we say about its genetic diversity in the light of molecular markers?

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Abstract

Knowledge about genetic variability of a crop allows for more efficient and effective use of resources in plant improvement programs. The genetic variation within temperate maize has been studied extensively, but the levels and patterns of diversity in tropical maize are still not well understood. Brazilian maize germplasm represents a very important pool of genetic diversity due to many past introductions of exotic material. To improve our knowledge of the genetic diversity in tropical maize inbred lines, we fingerprinted 85 lines with 569 AFLP bands and 50 microsatellite loci. These markers revealed substantial variability among lines, with high rates of polymorphism. Cluster analysis was used to identify groups of related lines. Well-defined groups were not observed, indicating that the tropical maize studied is not as well organized as temperate maize. Three types of genetic distance measurements were applied (Jaccard’s coefficient, Modified Rogers’ distance and molecular coefficient of coancestry), and the values obtained with all of them indicated that the genetic similarities were small among the lines. The different coefficients did not substantially affect the results of cluster analysis, but marker types had a large effect on genetic similarity estimates. Regardless of genetic similarity coefficient used, estimates based on AFLPs were poorly correlated with those based on SSRs. Analyses using AFLP and SSR data together do not seem to be the most efficient manner of assessing variability in highly diverse materials because the result was similar to using AFLPs alone. It was seen that molecular markers can help to organize the genetic variability and expose useful diversity for breeding purposes.

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Acknowledgments

The authors wish to thank CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior), FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo) (00/11517-4) and CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) for the financial support during the development of this research. A.P.S. and A.A.F.G. received a research fellowship from CNPq. The authors would like to express their gratitude to Dr. James B. Holland and to Dr. David Hoisington who carefully revised the manuscript and kindly provided valuable comments on it.

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Correspondence to A. P. de Souza.

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Communicated by D. A. Hoisington

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Laborda, P.R., Oliveira, K.M., Garcia, A.A.F. et al. Tropical maize germplasm: what can we say about its genetic diversity in the light of molecular markers?. Theor Appl Genet 111, 1288–1299 (2005). https://doi.org/10.1007/s00122-005-0055-7

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  • DOI: https://doi.org/10.1007/s00122-005-0055-7

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