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Maize Mutants for the 21st Century

Mutants provide the primary means of understanding gene function in higher plants. At the 1991 Maize Genetics Meeting, which was held in Delavan, Wisconsin, from March 21 to March 24, a practical new strategy for streamlining the identification and mapping of mutants was presented. The “integrated mapping project” will produce a single high-resolution map of the maize genome that combines physical, restriction fragment length polymorphism (RFLP), and gene markers. This project is a major undertaking for the maize community, with the rallying cry “20,000 loci by the year 2000!” In this report, I will explain the integrated mapping project and highlight presentations concerned with the characterization and cloning of new genes. Detailed descriptions of many of the mutants mentioned here are found in the chapters on genetics and cytogenetics in Sprague and Dudley (1988). Photographs of phenotypes are found in Neuffer et al. (1968). Another useful reference is Freeling and Walbot (1992).