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ARS Home » Southeast Area » Stuttgart, Arkansas » Dale Bumpers National Rice Research Center » Research » Publications at this Location » Publication #260283

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

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

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: http://www.intl-pag.org/18/abstracts/W74_PAGXVIII_523.html

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: http://www.intl-pag.org/18/abstracts/W74_PAGXVIII_523.html