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Using the 3k genomes to decipher the mosaic structure of genome diversity in rice

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Workshop  on  Plant  Genome  Dynamics  and  Evolution  

CIRAD  Campus  de  LAVALETTE  -­‐  MONTPELLIER  

Le  8  et  9  Juin  2017  

 

 

 

 

 

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Using  the  3k  genomes  to  decipher  the  mosaic  structure  of  genome  diversity  in  

rice  

Santos  J.

1

,  Billot  C.

1

,  Glaszmann  J.  C.

1    

  Introgression  among  rice  populations  is  worth  studying  for  its  role  as  a  path  to  adaptation.  

Along   human   migrations,   gene   flow   between   cultivars   and   wild   or   primitive   cultivated   forms   have   generated   new   types   which   thus   harbor   admixed   genomes   with   distinct   components   traceable   to   early   crop   history.   Recent   analyses   based   on   massive   sequencing   efforts   have   enabled   detailed   studies   of   crop   evolution   in   rice   that   revealed   introgressions   allowing   the   spread   of   domestication   factors   across   varietal   groups   as   well   as   the   secondary   hybrid   origin   of   some   varietal   clusters.   Yet   distinct   views   still   coexist   as   to   the   global   interpretation   of   the   data,   featuring   one   vs   multiple   domestication  events  and  diverse  scenarios  for  the  origin  of  secondary  varietal  groups.  Contrasting   hypotheses  make  it  difficult  to  draw  conclusions  from  the  data  given  their  weight  on  the  premises   underlying  any  analysis.  Nonetheless,  by  recognizing  the  existence  of  more  or  less  cohesive  groups  of   rice   varieties,   important   information   can   still   be   extracted   as   to   their   interactions.   The   results   presented  here  are  a  still  frame  of  our  analysis  of  the  exchanges  between  the  major  clusters  of  rice  

genetic   diversity,   Japonica,   Indica   and   circumAus,   as   can   be   determined   by   their   relative  

differentiation,  and  the  concomitant  retrieval  of  the  cryptic  circumBasmati  genetic  signature.  

 

Keywords:  rice,  gene  flow,  admixed  genomes,  cBasmati,  mosaic  

1  CIRAD  UMR  AGAP,  Montpellier  

 

 

 

 

 

 

 

 

 

 

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