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Journal of Heredity 2004:95(3):225-233
© 2004 The American Genetic Association

Salmon Silk Genes Contribute to the Elucidation of the Flavone Pathway in Maize (Zea mays L.)

M. D. McMullen, H. Kross, M. E. Snook, M. Cortés-Cruz, K. E. Houchins, T. A. Musket, and E. H. Coe, Jr

From the Plant Genetics Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Columbia, MO 65211 (McMullen, Houchins, and Coe); Department of Agronomy, Plant Sciences Unit, University of Missouri, Columbia, MO 65211 (McMullen, Kross, Cortés-Cruz; Musket, and Coe); and the Department of Plant Pathology, University of Georgia, Athens, GA 30601 (Snook). M. Cortés-Cruz is currently at the Waksman Institute, Rutgers University, Piscataway, NJ 08854.

Address correspondence to M. D. McMullen, 302 Curtis Hall, University of Missouri, Columbia, MO 65211, or e-mail: mcmullenm{at}missouri.edu.

We utilized maize (Zea mays L.) lines expressing the salmon silk (sm) phenotype, quantitative trait locus analysis, and analytical chemistry of flavone compounds to establish the order of undefined steps in the synthesis of the flavone maysin in maize silks. In addition to the previously described sm1 gene, we identified a second sm locus, which we designate sm2, located on the long arm of maize chromosome 2. Our data indicate that the sm1 gene encodes or controls a glucose modification enzyme and sm2 encodes or controls a rhamnosyl transferase. The order of intermediates in the late steps of maysin synthesis was established as luteolin -> isoorientin -> rhamnosylisoorientin -> maysin.


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