Novel Phr1 mutations and the evolution of phenol reaction variation in US weedy rice (Oryza sativa).

*Red rice, a major agricultural weed, is phenotypically diverse and possesses traits that are similar to both wild and cultivated rice. The genetic resources available for rice make it possible to examine the molecular basis and evolution of traits characterizing this weed. Here, we assess the phenol reaction - a classical trait for distinguishing among cultivated rice varieties - in red rice at the phenotypic and molecular levels.