Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 6/3/2004
Publication Date: 6/3/2004
Citation: Clements, M.J., Brooks, T.D., Windham, G.L., Williams, W.P., Maragos, C.M., White, D.G. 2004. Aflatoxin and fumonisin accumulation in grain: identifying novel resistance sources and incorporating resistance into commercial genetic backgrounds [abstract]. In: Proceedings of the 45th Annual Corn Dry Milling Conference, June 3-4, 2004, Peoria, Illinois. p.12-13.
Technical Abstract: Corn hybrids with naturally occurring genetic resistance to disease and insects, and genetic tolerance to environmental stress, are generally considered to be the most effective, efficient, and publicly acceptable means of minimizing aflatoxin and fumonisin contamination in grain prior to harvest. The goals of researchers with the University of Illinois and the USDA Corn Host Plant Resistance Research Unit at Mississippi State University are to identify and develop inbred lines that contribute a high level of resistance and high yield to hybrid performance. Genetic mapping of populations developed with inbreds that are resistant to aflatoxin or fumonisin accumulation in grain are underway. Several of these inbreds do not share common chromosome regions associated with resistance; therefore, incorporating, or "pyramiding", resistance from multiple sources into a commercial genetic background should be beneficial. Resistance to aflatoxin accumulation in grain from inbreds Tex6 and Mp313E is currently being incorporated into the commercial inbred FR1064 at the University of Illinois. Lines developed through the USDA germplasm enhancement of maize (GEM) project are selections from crosses of temperate x tropical or subtropical (here defined as "exotic") germplasm, and are the result of collaborative research undertaken by the USDA-ARS, land-grant universities, and industry. Two hundred-ten GEM accessions previously selected for yield, agronomics, and/ or value-added traits through GEM are being evaluated for resistance to Aspergillus ear rot, aflatoxin accumulation in grain, and feeding damage from southwestern corn borer at Mississippi State. GEM accessions will be crossed with commercial testers Holden's LH195 and LH210 for evaluations of hybrid performance in 2005. Ear-to-row and recurrent selection programs are underway with several promising lines.