The Genetics of Maize Evolution
TLDR
Molecular analyses identified one form of teosinte (Zea mays ssp. parviglumis) as the progenitor of maize and a few loci of large effect that appear to represent key innovations during maize domestication.Abstract:
▪ Abstract Maize and its closest wild relatives, the teosintes, differ strikingly in the morphology of their female inflorescences or ears. Despite their divergent morphologies, several studies indicate that some varieties of teosinte are cytologically indistinguishable from maize and capable of forming fully fertile hybrids with maize. Molecular analyses identified one form of teosinte (Zea mays ssp. parviglumis) as the progenitor of maize. Analyses of the inheritance of the morphological traits that distinguish maize and teosinte indicates that they are under the control of multiple genes and exhibit quantitative inheritance. Nevertheless, these analyses have also identified a few loci of large effect that appear to represent key innovations during maize domestication. Remaining challenges are to identify additional major and minor effect genes, the polymorphisms within these genes that control the phenotypes, and how the combination of the individual and epistatic effects of these genes transformed teo...read more
Citations
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References
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Journal ArticleDOI
The evolution of apical dominance in maize
TL;DR: The cloned teosinte branched1 (tb1) gene encodes a protein with homology to the cycloidea gene of snapdragon and suggests that tb1 acts both to repress the growth of axillary organs and to enable the formation of female inflorescences.
Journal ArticleDOI
fw2.2: a quantitative trait locus key to the evolution of tomato fruit size.
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TL;DR: Alterations in fruit size, imparted by fw2.2 alleles, are most likely due to changes in regulation rather than in the sequence and structure of the encoded protein.
Journal ArticleDOI
A single domestication for maize shown by multilocus microsatellite genotyping
Yoshihiro Matsuoka,Yves Vigouroux,Major M. Goodman,G Jesus Sanchez,Edward S. Buckler,John Doebley +5 more
TL;DR: All maize arose from a single domestication in southern Mexico about 9,000 years ago, consistent with a model based on the archaeological record suggesting that maize diversified in the highlands of Mexico before spreading to the lowlands.
Journal ArticleDOI
The limits of selection during maize domestication
TL;DR: The results help to explain why maize is such a variable crop, and suggest that maize domestication required hundreds of years, and confirm previous evidence that maize was domesticated from Balsas teosinte of southwestern Mexico.
Journal ArticleDOI
teosinte branched1 and the origin of maize: evidence for epistasis and the evolution of dominance.
TL;DR: It is proposed that tb1 is involved in the plant's response to local environment to produce either long or short branches and that maize evolution involved a change at this locus to produce short branches under all environments.
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