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Toxins 2013, 5(1), 162-172; doi:10.3390/toxins5010162
Article

Maize Aflatoxin Accumulation Segregates with Early Maturing Selections from an S2 Breeding Cross Population

Department of Plant and Soil Sciences, Mississippi State University, 117 Dorman Hall, Box 9555, MS 39762, USA
Received: 27 December 2012 / Revised: 9 January 2013 / Accepted: 9 January 2013 / Published: 15 January 2013
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Abstract

Maize breeders continue to seek new sources of aflatoxin resistance, but most lines identified as resistance sources are late maturing. The vast difference in flowering time makes it hard to cross these lines with proprietary commercial lines that mature much earlier and often subjects the reproductive phase of these resistant lines to the hottest and driest portion of the summer, making silking, pollination and grain fill challenging. Two hundred crosses from the GEM Project were screened for aflatoxin accumulation at Mississippi State in 2008, and a subset of these lines were screened again in 2009. The breeding cross UR13085:S99g99u was identified as a potential source of aflatoxin resistance, and maturity-based selections were made from an S2 breeding population from this same germplasm source: UR13085:S99g99u-B-B. The earliest maturing selections performed poorly for aflatoxin accumulation, but later maturing selections were identified with favorable levels of aflatoxin accumulation. These selections, while designated as “late” within this study, matured earlier than most aflatoxin resistant lines presently available to breeders. Two selections from this study, designated S5_L7 and S5_L8, are potential sources of aflatoxin resistance and will be advanced for line development and additional aflatoxin screening over more site years and environments.
Keywords: aflatoxin; GEM Project; maize germplasm; bidirectional selection; Aspergillus flavus; maturity aflatoxin; GEM Project; maize germplasm; bidirectional selection; Aspergillus flavus; maturity
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Henry, W.B. Maize Aflatoxin Accumulation Segregates with Early Maturing Selections from an S2 Breeding Cross Population. Toxins 2013, 5, 162-172.

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