Genetic and molecular analyses of the incompatibility between Lolium isolates of Pyricularia oryzae and wheat |
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| Institution: | 1. Department of Obstetrics and Gynecology, Independent Consultant, Constantine, Algeria, North Africa (Dr. Sedrati);2. Department of Obstetrics and Gynecology, University of California Davis Medical Center, Sacramento, California (Dr. Wong);3. Department of Gynecological Surgery, Centro Gutenberg, Malaga, Spain (Dr. Alonso);4. Department of Obstetrics, Gynecology, and Reproductive Sciences, University of Miami Miller School of Medicine, Miami, Florida (Dr. Carugno) |
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| Abstract: | Pyricularia oryzae isolates from Lolium spp. (annual ryegrass and perennial ryegrass) show evidence of recent events in evolution of this fungus. A wheat blast isolate found in Kentucky in 2011 was assumed to originate from annual ryegrass isolates. Genetic analyses revealed that the incompatibility between a Lolium isolate and common wheat cultivars is controlled by two gene pairs, Rmg6–A1 with a strong effect and R2-A2 with a weak effect, implying that this incompatibility is conditioned by simple gene-for-gene interactions. Disruption of the A1 avirulence gene led the Lolium isolate to gain virulence on common wheat. These results suggest a mechanism for host jumping by the blast fungus. |
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| Keywords: | Avirulence gene |
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