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PMID: 17704539 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Review

Genomic screening for artificial selection during domestication and improvement in maize.

Annals of botany ·Vol. 100 ·No. 5 ·2007-11-00 ·Pages 967-73

Yamasaki M, Wright SI, McMullen MD

Abstract

Artificial selection results in phenotypic evolution. Maize (Zea mays L. ssp. mays) was domesticated from its wild progenitor teosinte (Zea mays subspecies parviglumis) through a single domestication event in southern Mexico between 6000 and 9000 years ago. This domestication event resulted in the original maize landrace varieties. The landraces provided the genetic material for modern plant breeders to select improved varieties and inbred lines by enhancing traits controlling agricultural productivity and performance. Artificial selection during domestication and crop improvement involved selection of specific alleles at genes controlling key morphological and agronomic traits, resulting in reduced genetic diversity relative to unselected genes. This review is a summary of research on the identification and characterization by population genetics approaches of genes affected by artificial selection in maize. Analysis of DNA sequence diversity at a large number of genes in a sample of teosintes and maize inbred lines indicated that approx. 2 % of maize genes exhibit evidence of artificial selection. The remaining genes give evidence of a population bottleneck associated with domestication and crop improvement. In a second study to efficiently identify selected genes, the genes with zero sequence diversity in maize inbreds were chosen as potential targets of selection and sequenced in diverse maize landraces and teosintes, resulting in about half of candidate genes exhibiting evidence for artificial selection. Extended gene sequencing demonstrated a low false-positive rate in the approach. The selected genes have functions consistent with agronomic selection for plant growth, nutritional quality and maturity. Large-scale screening for artificial selection allows identification of genes of potential agronomic importance even when gene function and the phenotype of interest are unknown. These approaches should also be applicable to other domesticated species if specific demographic conditions during domestication exist.

MeSH Terms
Agriculture Genome, Plant Genomics Selection, Genetic Zea mays/genetics
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Yamasaki Masanori
Division of Plant Sciences, University of Missouri, Columbia, Missouri 65211, USA. [email protected]
Wright Stephen I
McMullen Michael D
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Article Info
Journal
Annals of botany
Abbr.
Ann Bot
ISSN
1095-8290
DOI
10.1093/aob/mcm173
Email
[email protected]
Published
2007-11-00
Epub
2007-00-18
Pages
967-73
Language
English
Region
England
NLM ID
0372347
PMCID
PMC2759211
Subset
IM
External Links
PubMed source DOI: 10.1093/aob/mcm173 PMC Full Text View journal details
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