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Evaluation of Maize Germplasm for Resistance to Aflatoxin Accumulation
USDA-ARS, Corn Plant Host Resistance Research Unit, Box 9555, Mississippi State, MS 39762, USA
GEM Coordinator, USDA-ARS, Plant Introduction Research Unit, G212 Agronomy Hall, Iowa State University, Ames, IA 50011, USA
* Author to whom correspondence should be addressed.
Received: 12 February 2012; in revised form: 6 March 2012 / Accepted: 7 March 2012 / Published: 14 March 2012
Abstract: Aflatoxin contamination of maize grain threatens human food and animal feed safety. Breeding for reduced grain aflatoxin accumulation is one of the best strategies presently available to lower grain aflatoxin accumulation. Previously identified sources of germplasm with reduced grain aflatoxin accumulation are excessively tall and late maturing. The objective of this research was to screen germplasm and identify potential sources of aflatoxin resistance. KO679Y and CUBA117:S15-101-001-B-B-B-B inbreds were evaluated for aflatoxin accumulation alongside resistant and susceptible checks with both performing well. These two lines were also evaluated in various crosses. KO679Y performed especially well in crosses with Mp494 and Mp717, resulting in low ear rot and very low aflatoxin levels, but not well in other crosses. A breeding cross including CUBA117:S15-101-001-B-B-B-B as a parent accumulated low levels of aflatoxin both years it was evaluated. Lines resulting from these crosses are being advanced for further evaluation and improvement. KO679Y and CUBA117:S15-101-001-B-B-B-B may prove useful for breeders seeking germplasm sources for ear rot and mycotoxin reduction, especially KO679Y which matures a week earlier and is approximately 25% shorter than current lines resistant to grain aflatoxin accumulation.
Keywords: Zea mays; Aspergillus flavus; aflatoxin; inbred; KO679Y; hybrid; single cross
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Henry, W.B.; Windham, G.L.; Blanco, M.H. Evaluation of Maize Germplasm for Resistance to Aflatoxin Accumulation. Agronomy 2012, 2, 28-39.
Henry WB, Windham GL, Blanco MH. Evaluation of Maize Germplasm for Resistance to Aflatoxin Accumulation. Agronomy. 2012; 2(1):28-39.
Henry, W. Brien; Windham, Gary L.; Blanco, Michael H. 2012. "Evaluation of Maize Germplasm for Resistance to Aflatoxin Accumulation." Agronomy 2, no. 1: 28-39.