Evolutionary genomics of weedy rice in the USA

Kenneth M. Olsen, Ana L. Caicedo, Yulin Jia

Research output: Contribution to journalReview articlepeer-review

42 Scopus citations


Red rice is an interfertile, 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 cultivars, 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. rufipogon), 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 genomics of this aggressive weed.

Original languageEnglish
Pages (from-to)811-816
Number of pages6
JournalJournal of Integrative Plant Biology
Issue number6
StatePublished - Jun 2007


  • Crop-weed introgression
  • De-domestication
  • Oryza sativa
  • Weed evolution
  • Weedy rice


Dive into the research topics of 'Evolutionary genomics of weedy rice in the USA'. Together they form a unique fingerprint.

Cite this