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2017 ; 27
(6
): 1029-1038
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gab.com Text
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English Wikipedia
Asian wild rice is a hybrid swarm with extensive gene flow and feralization from
domesticated rice
#MMPMID28385712
Wang H
; Vieira FG
; Crawford JE
; Chu C
; Nielsen R
Genome Res
2017[Jun]; 27
(6
): 1029-1038
PMID28385712
show ga
The domestication history of rice remains controversial, with multiple studies
reaching different conclusions regarding its origin(s). These studies have
generally assumed that populations of living wild rice, O. rufipogon, are
descendants of the ancestral population that gave rise to domesticated rice, but
relatively little attention has been paid to the origins and history of wild rice
itself. Here, we investigate the genetic ancestry of wild rice by analyzing a
diverse panel of rice genomes consisting of 203 domesticated and 435 wild rice
accessions. We show that most modern wild rice is heavily admixed with
domesticated rice through both pollen- and seed-mediated gene flow. In fact, much
presumed wild rice may simply represent different stages of feralized
domesticated rice. In line with this hypothesis, many presumed wild rice
varieties show remnants of the effects of selective sweeps in previously
identified domestication genes, as well as evidence of recent selection in
flowering genes possibly associated with the feralization process. Furthermore,
there is a distinct geographical pattern of gene flow from aus, indica, and
japonica varieties into colocated wild rice. We also show that admixture from aus
and indica is more recent than gene flow from japonica, possibly consistent with
an earlier spread of japonica varieties. We argue that wild rice populations
should be considered a hybrid swarm, connected to domesticated rice by continuous
and extensive gene flow.