Seed Dormancy in Mexican Teosinte
- Adriana Natividad Avendaño López *,
- José de Jesús Sánchez González,
- José Ariel Ruíz Corral,
- Lino De La Cruz Larios,
- Fernando Santacruz-Ruvalcaba,
- Carla Vanessa Sánchez Hernández and
- James B. Holland
Universidad de Guadalajara, Centro Universitario de Ciencias Biológicas y Agropecuarias, Zapopan 45110, Jalisco, México Universidad de Guadalajara, Centro Universitario de Ciencias Biológicas y Agropecuarias, Zapopan 45110, Jalisco, México Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias Parque Los Colomos S/N 2da. Sección, Col. Providencia, Guadalajara 44660, Jalisco, México Universidad de Guadalajara, Centro Universitario de Ciencias Biológicas y Agropecuarias, Zapopan 45110, Jalisco, México USDA-ARS, Plant Science Research Unit, Dep. of Crop Science, Box 7620, North Carolina State Univ., Raleigh, NC 27695
Seed dormancy in wild Zea species may affect fitness and relate to ecological adaptation. The primary objective of this study was to characterize the variation in seed germination of the wild species of the genus Zea that currently grow in México and to relate this variation to their ecological zones of adaptation. In addition, we compared methods to break dormancy and measured the germination responses of seeds to environment factors that are related to seasonal changes. Teosinte populations representing all the taxonomic and racial groups known in México were collected during the period 2003 to 2008 in twelve states of México. Seed dormancy was classified according to the rate of its loss (depth of dormancy). Results indicated that more than 90% of populations studied had some degree of seed dormancy. Nondormant populations are distributed predominantly in semicold areas, while deep and very deep seed dormancy was found in populations distributed in hot and very hot environments in well defined geographic regions of the Balsas River Basin and in San Felipe Usila, Oaxaca. Mechanical seed scarification was the best method to break dormancy.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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