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United States Department of Agriculture

Agricultural Research Service

Research Project: RESPONSE OF DIVERSE RICE GERMPLASM TO BIOTIC AND ABIOTIC STRESSES 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: November 30, 2009
Publication Date: December 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:

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: 8/25/2016