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Isozymatic and Morphological Diversity in the Races of Maize of Mexico

Diversidad IsoenzimÁTica Y MorfolÓGica En Las Razas De MaiíZ De MÉXico.

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Abstract

To determine the relationships and genetic diversity among the Mexican races of maize, 209 accessions representing 59 races were analyzed for 21 enzyme systems encoded by 37 loci; 154 out of the 209 accessions were grown in multiple locations and seasons in Mexico and 47 morphological characters were measured. A very high level of variation among and within the Mexican races was found. However, more than 65% of the alleles found in the accessions studied are rare, occurring at frequencies below 0.01. In addition, some populations have low levels of genetic diversity and have values of genetic differentiation similar to selflng crops. Most of the accessions with low values of genetic diversity are specialty varieties.

Résumé

Con el fin de determinar las interrelaciones y la diversidad genética entre las razas mexicanas de maíz, se analizaron 21 sistemas enzimdticos (37 loci) en 209 colecciones representantes de 59 razas; 154 colecciones del grupo anterior fueron sembradas en diferentes ambientes de Mexico y se midieron 47 caracteres morfológicos en forma directa. Los análisis de los datos mostraron que el maíz en Mexico posee niveles altos de variabilidad tanto entre como dentro de razas. Sin embargo, más del 65% de los alelos encontrados en las colectas estudiadas son raros, es decir, ocurren en frecuencias menores a 0.01. Adicionalmente, varias poblaciones tienen niveles bajos de diversidad y valores de diferenciación genética similares a especies autógamas. La mayoría de las accesiones con niveles bajos de diversidad genética son vaiedades para usos especiales. Key Words: Zea mays L., isozymes, genetic diversity, gnetic differentiation.

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Authors and Affiliations

  1. Centro Universitario de Ciencias Biologicas y Agropecuarias, Universidad de Guadalajara, Km 15.5 Guadalajara-Nogales, CP45110, Las Agujas, Zapopan, Jalisco, Mexico

    J. J. Sanchez G.

  2. Department of Crop Science, North Carolina State University, Box 7620, 27695-7620, Raleigh, NC

    M. M. Goodman

  3. Department of Genetics and USDA-ARS, North Carolina State University, 27695, Raleigh, NC

    C. W. Stuber

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  1. J. J. Sanchez G.
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  2. M. M. Goodman
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  3. C. W. Stuber
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Isozymatic And Morphological Diversity In The Races Of Maize Of Mexico. Economic Botany 54(]):43–59, 2000.

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Sanchez G., J.J., Goodman, M.M. & Stuber, C.W. Isozymatic and Morphological Diversity in the Races of Maize of Mexico. Econ Bot 54, 43–59 (2000). https://doi.org/10.1007/BF02866599

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