Red rice Is an Interfertlle, weedy form of cultivated rice （Oryza sativa L.） that competes aggressively with the crop In the southern US, reducing yields and contaminating harvests. No wild Oryza species occur In No...Red rice Is an Interfertlle, weedy form of cultivated rice （Oryza sativa L.） that competes aggressively with the crop In the southern US, reducing yields and contaminating harvests. No wild Oryza species occur In North America and the weed has been proposed to have evolved through multiple mechanisms, Including ＂de-domestication＂ of US crop cultlvars, accidental introduction of Asian weeds, and hybridization between US crops and Asian wild/weedy Oryza strains. The phenotype of US red rice ranges from ＂crop mimics＂, which share some domestication traits with the crop, to strains closely resembling Asian wild Oryza species. Assessments of genetic diversity have Indicated that many weed strains are closely related to Asian taxa （Including indica and aus rice varieties, which have never been cultivated In the US, and the Asian crop progenitor O. ruflpogon）, whereas others show genetic similarity to the tropical Japonica varieties cultivated In the southern US. Herein, we review what Is known about the evolutionary origins and genetic diversity of US red rice and describe an ongoing research project to further characterize the evolutionary genomlcs of this aggressive weed.展开更多
基金Supported by the National Science Foundation Plant Genome Research Program （DBI-0638820）. Publication of this paper is supported by the National Natural Science Foundation of China （30624808）.Acknowledgements The authors thank David R. Gealy of the Dale Bumpers National Rice Research Center for his insightful comments on US red rice natural history and genetic diversity.
文摘Red rice Is an Interfertlle, weedy form of cultivated rice （Oryza sativa L.） that competes aggressively with the crop In the southern US, reducing yields and contaminating harvests. No wild Oryza species occur In North America and the weed has been proposed to have evolved through multiple mechanisms, Including ＂de-domestication＂ of US crop cultlvars, accidental introduction of Asian weeds, and hybridization between US crops and Asian wild/weedy Oryza strains. The phenotype of US red rice ranges from ＂crop mimics＂, which share some domestication traits with the crop, to strains closely resembling Asian wild Oryza species. Assessments of genetic diversity have Indicated that many weed strains are closely related to Asian taxa （Including indica and aus rice varieties, which have never been cultivated In the US, and the Asian crop progenitor O. ruflpogon）, whereas others show genetic similarity to the tropical Japonica varieties cultivated In the southern US. Herein, we review what Is known about the evolutionary origins and genetic diversity of US red rice and describe an ongoing research project to further characterize the evolutionary genomlcs of this aggressive weed.
