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Aflatoxin accumulation in BT and non-BT maize testcrosses
- The accumulation of aflatoxin, produced by the fungus Aspergillus flavus in maize, is a chronic problem in the southeastern United States. Its presence in grain greatly reduces its value and marketability. Aflatoxin accumulation is frequently associated with high temperatures, drought, and insect damage. Ten maize germplasm lines, some selected for resistance to aflatoxin accumulation, were crossed to transgenic (transformed with genes from Bacillus thuringiensis Berliner (BT) and expressing the Cry1Ab protein) and non-transgenic versions of LH287. Testcrosses were evaluated for ear damage from insect feeding and aflatoxin accumulation. Ear damage caused by insect feeding and aflatoxin accumulation was significantly less in BT than non-BT testcrosses. The germplasm line BT/non-BT interaction was not significant. Three lines selected for resistance to aflatoxin accumulation (Mp313E, Mp717, Mp04:97) exhibited the lowest levels of aflatoxin whether crossed to the BT or non-BT versions of LH287. Neither the levels of aflatoxin accumulation nor ear damage differed significantly between the BT and non-BT versions of these hybrids. This indicates that adding BT to hybrids produced from Mp313E, Mp717, or Mp04:97 would not be expected to increase resistance to aflatoxin accumulation.
Williams, W. Paul , Windham, Gary L. , Krakowsky, Matthew D. , Scully, Brian T. , Ni, Xinzhi
Zea mays , corn , fungal diseases of plants , Aspergillus flavus , plant pathogenic fungi , pathogenicity , aflatoxins , biosynthesis , quantitative analysis , disease resistance , insect pests , Diatraea grandiosella , Helicoverpa zea , Spodoptera frugiperda , pest resistance , plant breeding , Bacillus thuringiensis , gene transfer , transgenic plants , germplasm screening , North Carolina , Georgia , Mississippi
- Includes references
- Journal of crop improvement 2010 Oct-Dec, v. 24, no. 4
Journal Articles, USDA Authors, Peer-Reviewed
- Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.