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The goal of this project was to develop a transposon mutagenesis system for lettuce and to clone and characterize disease resistance genes by transposon tagging. The majority of studies were conducted with the Ac/Ds System. Researchers made and tested several constructs as well as utilized constructions shown to be functional in other plant species. Researchers demonstrated movement of Ac and DS in lettuce; however, they transposed at much lower frequencies in lettuce than in other plant species. Therefore, further manipulation of the system, particularly for flower specific expression of transposase, is required before a routine transposon system is available for lettuce. Populations of lettuce were generated and screened to test for the stability of resistance genes and several spontaneous mutations were isolated. Researchers also identified a resistance gene mutant in plants transformed with a Ds element and chimeric transposase gene. This is currently being characterized in detail.

Transposon tagging of disease resistance genes. Final report, May 1, 1988--April 30, 1993