Submitted to: Plant and Animal Genome VX Conference Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 8/26/2003
Publication Date: 8/23/2003
Citation: CURLEY, J., SIM, S., LEONG, S.A., WARNKE, S.E., BARKER, R.E., JUNG, G. COMPARATIVE MAPPING OF MAGNAPORTHE GRISEA RESISTANCE GENES AND QTL IN RICE, BARLEY, AND PERENNIAL RYEGRASS. PLANT AND ANIMAL GENOME XI. 2003. Abstract p. 115. Interpretive Summary:
Technical Abstract: Perennial ryegrass (Lolium perenne L.) is a cool season grass used primarily for turf and forage throughout the world. In recent years, a new disease known as gray leaf spot has become a serious problem on perennial ryegrass. It is caused by Magnaporthe grisea, the fungus that causes rice blast disease on rice, as well as other diseases on a very wide host range among the grass family. A partial genetic linkage map of an annual x perennial ryegrass population has been previously constructed using AFLP and RAPD markers. A high-density genetic linkage map constructed using a common set of heterologous RFLP probes would be a very valuable tool, facilitating the location, manipulation, and comparison of individual genetic factors associated with complex traits such as disease resistance. A common set of cereal RFLP markers, which have been mapped in other cereals, have been added onto the existing ryegrass map. The mapping population was also evaluated for gray leaf spot resistance in greenhouse inoculations. Via comparative and QTL mapping approaches, locations and effects of M. grisea resistance genes and QTL across host species such as rice, barley, and perennial ryegrass will be discussed, as relates to possible evolutionary aspects of M. grisea resistance in the grasses.