Geographical distribution and diversity of maize (Zea mays L. subsp. mays) races in Mexico

Periodo de realización: 1900/01/01 al 2017/06/01

Tipo: Artículo científico

Lugar(es) de estudio: México
Resumen: "The center of origin of maize is in Mexicoand maize diversity is very high in many parts of thecountry. Here we describe and analyze the geographicdistribution and diversity of maize using a database of18,176 georeferenced observations of maize races.The number of observations by race follows thecommon ‘‘hollow curve’’ distribution, with six racescomprising 54 % of the records and 37 races only10 %. Few races are widespread, and some have ahighly localized distribution. The average maximumdistance (Dmax) between two records of the same racewas 1169 km, but seven races had a Dmax lower than200 km. The average circular area range size (CA25)was 51, but 14 races had a CA25 lower than 10. Someraces have very few observations but were found overa large area. These races may not be valid and theirclassification should be reviewed. Areas of high racerichness and diversity are in mountainous northwest,south central, and southern Mexico in the states ofOaxaca, Jalisco, Michoaca´n and Chiapas. Six contiguousmaize regions were defined using hierarchicalclustering. Despite the high sample size, furthersampling could improve estimates of race diversityin several regions."

Información de ECOSUR