文献类型: 外文期刊
作者: Warburton, Marilyn L. 1 ; Wilkes, Garrison 2 ; Taba, S. 3 ; Charcosset, Alain 4 ; Mir, Celine 4 ; Dumas, Fabrice 4 ; M 1 ;
作者机构: 1.USDA ARS, Corn Host Plant Resistance Res Unit, Box 9555, Mississippi State, MS 39762 USA
2.Univ Massachusetts, Dept Biol, Boston, MA 02125 USA
3.CIMMYT, Mexico City 06600, DF, Mexico
4.INRA INA PG UPS CNRS, Stn Genet Vegetale, F-91190 Gif Sur Yvette, France
5.CAAS, Inst Crop Sci, Beijing 100081, Peoples R China
6.IITA, Ibadan, Nigeria
关键词: species evolution;gene flow;gene diversity;GenBank sequence data;biotic/abiotic stress;species in situ conservation
期刊名称:GENETIC RESOURCES AND CROP EVOLUTION ( 影响因子:1.524; 五年影响因子:1.713 )
ISSN:
年卷期:
页码:
收录情况: SCI
摘要: Maize (Zea mays L. ssp. mays) was domesticated from one wild species ancestor, the Balsas teosinte (Zea mays ssp. parviglumis) about 9000 years ago. Higher levels of gene diversity are found in teosinte taxa compared to maize, following domestication and selection bottlenecks. Diversity in maize can be increased via gene flow from teosinte, which has certainly occurred from various taxa, but the rate of flow from different teosinte taxa and the final impact on maize evolution has been difficult to measure. One hundred populations from six Zea taxa, both domesticated (maize) and wild (teosinte), including domesticated landraces from Asia, Africa, and the Americas, were genotyped with 17 SSR markers using 15 individuals per population. Overall levels of diversity were high, and populations could be distinguished based on markers. Relationships between populations followed most published reports, or can now help resolve previously conflicting reports. Gene flow into maize from different teosinte groups, and gene flow between different teosintes, was estimated. Evidence for contributions from the Balsas teosintes and from Chalco teosintes (Z. mays ssp. mexicana) to the maize gene pool was found, as well as from Chalco into ssp. mexicana race "Durango" and Z. mays ssp. huehuetenengensis. These contributions are almost certainly the result of post-domestication (and ongoing) exchanges. This information must give more impetus to in situ conservation of teosinte species, and use of these teosintes to continue to direct the evolution of maize, especially in response to new diseases, insect pests, and other biotic and abiotic stresses.
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