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Building on these resources and tools, this project will address the longstanding challenge of identifying DNA sequences responsible for traits that vary in a quantitative way, called “quantitative trait loci” (QTL), and making them amenable for crop improvement.  While QTL are key determinants of crop productivity, they have been exceedingly difficult to study, and very little is known about them. This project focuses on QTL for disease resistance, disease susceptibility, and tolerance to acid soils in the globally important crop species, rice. The project will isolate DNA sequences associated with high levels of these traits and test whether those sequences are responsible by moving them into rice varieties that show low levels and measuring the result.