Pollen-Mediated Gene Flow in Maize: Implications for Isolation Requirements and Coexistence in Mexico, the Center of Origin of Maize
Mexico, the center of origin of maize (Zea mays L.), has taken actions to preserve the identity and diversity of maize landraces and wild relatives. Historically, spatial isolation has been used in seed production to maintain seed purity. Spatial isolation can also be a key component for a strategy...
| Autores principales: | , , , , , , , , , , , , , , , |
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| Formato: | Artículo |
| Lenguaje: | inglés |
| Publicado: |
Public Library of Science
2015
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| Acceso en línea: | http://eprints.uanl.mx/14952/1/123.pdf |
| _version_ | 1824414202333233152 |
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| author | Peña, Leandro Baltazar, Baltazar M. Castro Espinoza, Luciano Espinoza Banda, Armando De la Fuente Martínez, Juan Manuel Garzón Tiznado, José Antonio González García, Juvencio Gutiérrez, Marco Antonio Guzmán Rodríguez, José Luis Heredia Díaz, Oscar Horak, Michael J. Madueño Martínez, Jesús Ignacio Schapaugh, Adam W. Stojšin, Duška Uribe Montes, Hugo Raúl Zavala García, Francisco |
| author_facet | Peña, Leandro Baltazar, Baltazar M. Castro Espinoza, Luciano Espinoza Banda, Armando De la Fuente Martínez, Juan Manuel Garzón Tiznado, José Antonio González García, Juvencio Gutiérrez, Marco Antonio Guzmán Rodríguez, José Luis Heredia Díaz, Oscar Horak, Michael J. Madueño Martínez, Jesús Ignacio Schapaugh, Adam W. Stojšin, Duška Uribe Montes, Hugo Raúl Zavala García, Francisco |
| author_sort | Peña, Leandro |
| collection | Repositorio Institucional |
| description | Mexico, the center of origin of maize (Zea mays L.), has taken actions to preserve the identity and diversity of maize landraces and wild relatives. Historically, spatial isolation has been used in seed production to maintain seed purity. Spatial isolation can also be a key
component for a strategy to minimize pollen-mediated gene flow in Mexico between transgenic maize and sexually compatible plants of maize conventional hybrids, landraces, and wild relatives. The objective of this research was to generate field maize-to-maize outcrossing
data to help guide coexistence discussions in Mexico. In this study, outcrossing rates were determined and modeled from eight locations in six northern states, which represent the most economically important areas for the cultivation of hybrid maize in Mexico. At each site, pollen source plots were planted with a yellow-kernel maize hybrid and surrounded by plots with a white-kernel conventional maize hybrid (pollen recipient) of the same maturity. Outcrossing rates were then quantified by assessing the number of yellow kernels harvested from white-kernel hybrid plots. The highest outcrossing values were observed near the pollen source (12.9% at 1 m distance). The outcrossing levels declined sharply to 4.6, 2.7, 1.4, 1.0, 0.9, 0.5, and 0.5% as the distance from the pollen source increased to 2, 4, 8, 12, 16, 20, and 25 m, respectively. At distances beyond 20 m outcrossing values at all locations were below 1%. These trends are consistent with studies conducted in other world regions. The results suggest that coexistence measures that have been implemented in other geographies, such as spatial isolation, would be successful in Mexico to minimize transgenic maize pollen flow to conventional maize hybrids, landraces and wild relatives. |
| format | Article |
| id | eprints-14952 |
| institution | UANL |
| language | English |
| publishDate | 2015 |
| publisher | Public Library of Science |
| record_format | eprints |
| spelling | eprints-149522021-04-22T01:18:43Z http://eprints.uanl.mx/14952/ Pollen-Mediated Gene Flow in Maize: Implications for Isolation Requirements and Coexistence in Mexico, the Center of Origin of Maize Peña, Leandro Baltazar, Baltazar M. Castro Espinoza, Luciano Espinoza Banda, Armando De la Fuente Martínez, Juan Manuel Garzón Tiznado, José Antonio González García, Juvencio Gutiérrez, Marco Antonio Guzmán Rodríguez, José Luis Heredia Díaz, Oscar Horak, Michael J. Madueño Martínez, Jesús Ignacio Schapaugh, Adam W. Stojšin, Duška Uribe Montes, Hugo Raúl Zavala García, Francisco Mexico, the center of origin of maize (Zea mays L.), has taken actions to preserve the identity and diversity of maize landraces and wild relatives. Historically, spatial isolation has been used in seed production to maintain seed purity. Spatial isolation can also be a key component for a strategy to minimize pollen-mediated gene flow in Mexico between transgenic maize and sexually compatible plants of maize conventional hybrids, landraces, and wild relatives. The objective of this research was to generate field maize-to-maize outcrossing data to help guide coexistence discussions in Mexico. In this study, outcrossing rates were determined and modeled from eight locations in six northern states, which represent the most economically important areas for the cultivation of hybrid maize in Mexico. At each site, pollen source plots were planted with a yellow-kernel maize hybrid and surrounded by plots with a white-kernel conventional maize hybrid (pollen recipient) of the same maturity. Outcrossing rates were then quantified by assessing the number of yellow kernels harvested from white-kernel hybrid plots. The highest outcrossing values were observed near the pollen source (12.9% at 1 m distance). The outcrossing levels declined sharply to 4.6, 2.7, 1.4, 1.0, 0.9, 0.5, and 0.5% as the distance from the pollen source increased to 2, 4, 8, 12, 16, 20, and 25 m, respectively. At distances beyond 20 m outcrossing values at all locations were below 1%. These trends are consistent with studies conducted in other world regions. The results suggest that coexistence measures that have been implemented in other geographies, such as spatial isolation, would be successful in Mexico to minimize transgenic maize pollen flow to conventional maize hybrids, landraces and wild relatives. Public Library of Science 2015 Article PeerReviewed text en cc_by_nc_nd http://eprints.uanl.mx/14952/1/123.pdf http://eprints.uanl.mx/14952/1.haspreviewThumbnailVersion/123.pdf Peña, Leandro y Baltazar, Baltazar M. y Castro Espinoza, Luciano y Espinoza Banda, Armando y De la Fuente Martínez, Juan Manuel y Garzón Tiznado, José Antonio y González García, Juvencio y Gutiérrez, Marco Antonio y Guzmán Rodríguez, José Luis y Heredia Díaz, Oscar y Horak, Michael J. y Madueño Martínez, Jesús Ignacio y Schapaugh, Adam W. y Stojšin, Duška y Uribe Montes, Hugo Raúl y Zavala García, Francisco (2015) Pollen-Mediated Gene Flow in Maize: Implications for Isolation Requirements and Coexistence in Mexico, the Center of Origin of Maize. PloS one, 10 (7). e0131549. ISSN 1932-6203 http://doi.org/10.1371/journal.pone.0131549 doi:10.1371/journal.pone.0131549 |
| spellingShingle | Peña, Leandro Baltazar, Baltazar M. Castro Espinoza, Luciano Espinoza Banda, Armando De la Fuente Martínez, Juan Manuel Garzón Tiznado, José Antonio González García, Juvencio Gutiérrez, Marco Antonio Guzmán Rodríguez, José Luis Heredia Díaz, Oscar Horak, Michael J. Madueño Martínez, Jesús Ignacio Schapaugh, Adam W. Stojšin, Duška Uribe Montes, Hugo Raúl Zavala García, Francisco Pollen-Mediated Gene Flow in Maize: Implications for Isolation Requirements and Coexistence in Mexico, the Center of Origin of Maize |
| thumbnail | https://rediab.uanl.mx/themes/sandal5/images/online.png |
| title | Pollen-Mediated Gene Flow in Maize: Implications for Isolation Requirements and Coexistence in Mexico, the Center of Origin of Maize |
| title_full | Pollen-Mediated Gene Flow in Maize: Implications for Isolation Requirements and Coexistence in Mexico, the Center of Origin of Maize |
| title_fullStr | Pollen-Mediated Gene Flow in Maize: Implications for Isolation Requirements and Coexistence in Mexico, the Center of Origin of Maize |
| title_full_unstemmed | Pollen-Mediated Gene Flow in Maize: Implications for Isolation Requirements and Coexistence in Mexico, the Center of Origin of Maize |
| title_short | Pollen-Mediated Gene Flow in Maize: Implications for Isolation Requirements and Coexistence in Mexico, the Center of Origin of Maize |
| title_sort | pollen mediated gene flow in maize implications for isolation requirements and coexistence in mexico the center of origin of maize |
| url | http://eprints.uanl.mx/14952/1/123.pdf |
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