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Published online on June 7, 2004, 10.1073/pnas.0402892101
PNAS | June 15, 2004 | vol. 101 | no. 24 | 9045-9050


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Genetics
Genetic control of branching in foxtail millet

Andrew N. Doust *, Katrien M. Devos {ddagger}, {dagger}, Michael D. Gadberry * §, Mike D. Gale {ddagger}, and Elizabeth A. Kellogg *

*Department of Biology, University of Missouri, 8001 Natural Bridge Road, St Louis, MO 63121; and {ddagger}John Innes Centre, Norwich Research Park, Colney, Norwich NR4 7UH, United Kingdom

Communicated by Peter H. Raven, Missouri Botanical Garden, St. Louis, MO, April 23, 2004 (received for review January 31, 2004)

Reduction in vegetative branching is commonplace when crops are domesticated from their wild progenitors. We have identified genetic loci responsible for these changes in foxtail millet (Setaria italica), a crop closely related to maize but whose genetics are little known. Quantitative trait locus (QTL) analysis and comparative genomics reveal that basal branching (tillering) and axillary branching are partially controlled by separate loci, and that the orthologue of teosinte branched1, the major gene controlling branching phenotype in maize, has only a minor and variable effect. We identify other candidate genes for control of branching, including a number of hormone biosynthesis pathway genes. These results suggest that similar phenotypic effects may not be produced by orthologous loci, even in closely related species, and that results from well characterized model systems such as maize must be reviewed critically before being applied to other species.

Abbreviations: QTL, quantitative trait locus; RFLP, restriction fragment length polymorphism; LOD, logarithm of odds; tb1, teosinte branched1.

§ Present address: Departments of Crop and Soil Sciences and Plant Biology, Miller Plant Sciences Building, University of Georgia, Athens, GA 30602.

{dagger} To whom correspondence should be addressed. E-mail: adoust{at}umsl.edu.

© 2004 by The National Academy of Sciences of the USA


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