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United States Department of Agriculture

Agricultural Research Service


Location: Dale Bumpers National Rice Research Center

Title: Genetic Isolation, Divergence And Gene Flow In O. sativa

item Mccouch, Susan
item Tung, Chih-wei
item Wright, Mark
item Zhao, Keyan
item Ali, Liakat
item Kovach, Michael
item Jiang, Hui
item Sweeny, Megan
item Kimball, Jennifer
item Tyagi, Wricha
item Imai, Ize
item Kim, Hyunjung
item Reynolds, Andy
item Eizenga, Georgia
item Mcclung, Anna
item Mcclung, Anna
item Bustamante, Carlos

Submitted to: Plant and Animal Genome Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 11/30/2009
Publication Date: 12/11/2009
Citation: McCouch S, Tung, CW, Wright M, Zhao K, Ali, ML Kovach M, Jiang H, Sweeny M, Kimball J, Tyagi W, Imai I, Kim HJ, Reynolds A, Eizenga GC, McClung AM, Bustamante CD,. 2010. Genetic isolation, divergence and gene flow in O. sativa. In: Proc. of the Plant & Animal Genomes XVIII Conf. 9-13 Jan. 2010. San Diego, California. Available at:

Interpretive Summary:

Technical Abstract: Knowledge about the structure and evolutionary history of naturally occurring variation in crops and their wild relatives provides insights into the complex process of domestication and new opportunities for utilizing novel alleles in crop improvement. Domesticated Asian rice (Oryza sativa L.) is comprised of five, well-differentiated subpopulations that evolved from a common, out-crossing wild ancestor, O. rufipogon, that is found distributed throughout tropical Asia. We seek to understand the evolutionary forces that acted on this ancestor to generate the phenotypic diversity and subpopulation structure of modern O. sativa. Using a 44K SNP chip and recently isolated domestication genes, we trace the evolutionary history of alleles that both define and transcend the deep population subdivisions of domesticated rice. Documented patterns of allele-sharing and dispersal suggest a complex pattern of gene flow, selection and genetic exchange in rice, coupled with an underlying tendency toward genetic isolation reinforced by inbreeding. Understanding the biological, social and cultural dynamics of these opposing processes challenges existing models of crop domestication and provides a framework for conserving, characterizing and utilizing wild and exotic germplasm in crop improvement. Online reference:

Last Modified: 10/19/2017
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