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United States Department of Agriculture

Agricultural Research Service

Title: Defining Genes for Quantitative Trait Loci in Maize.

Author
item McMullen, Michael

Submitted to: Plant Genome Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: January 15, 1996
Publication Date: N/A

Technical Abstract: The interpretation and application of results of quantitative trait locus (QTL) studies for crop improvement are usually limited by lack of information on metabolic pathways responsible for agronomic traits. An exception is antibiotic resistance to the corn earworm (CEW) by the C-glycosyl flavone, maysin, synthesized in maize silks via a branch of the well-characterized flavonoid pathway. Since complimentary DNA probes are available for both structural and regulatory loci for the pathway, we have used this system as a model to define the nature of genes for QTL for maysin synthesis. The two most intriguing results from this study were: 1) The importance of regulatory as opposed to structural loci in determining maysin content and CEW resistance and 2) the regulatory loci identified were not only controlling the structural genes required for maysin, but also the regulatory loci of the interconnecting anthocyanin pathway.

Last Modified: 9/10/2014
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