Characterization of a source of resistance to aflatoxin accumulation in maize

Abstract Aflatoxinproduced by the fungus Aspergillus flavus (Link:Fr) can accumulate in maize (Zea mays L.) and poses serious human health and economic concerns, especially in sub‐Saharan Africa. Genetic resistance against A. flavus infection and spread, and subsequent production of aflatoxin, is a...

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Autores principales:	Oluwaseun Ogunola, J. Spencer Smith, Wenwei Xu, Dinakar Bhattramakki, Daniel Jeffers, W. Paul Williams, Marilyn L. Warburton
Formato:	article
Lenguaje:	EN
Publicado:	Wiley 2021
Materias:	Agriculture S Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/19e96ab03f7d4992b227eb103e8e6c8f
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spelling	oai:doaj.org-article:19e96ab03f7d4992b227eb103e8e6c8f2021-11-24T11:36:03ZCharacterization of a source of resistance to aflatoxin accumulation in maize2639-669610.1002/agg2.20203https://doaj.org/article/19e96ab03f7d4992b227eb103e8e6c8f2021-01-01T00:00:00Zhttps://doi.org/10.1002/agg2.20203https://doaj.org/toc/2639-6696Abstract Aflatoxinproduced by the fungus Aspergillus flavus (Link:Fr) can accumulate in maize (Zea mays L.) and poses serious human health and economic concerns, especially in sub‐Saharan Africa. Genetic resistance against A. flavus infection and spread, and subsequent production of aflatoxin, is a key tool for reducing the problem. Some resistant inbred donor lines carry quantitative trait loci (QTL) for resistance that have a sufficiently large phenotypic effect to be used for marker assisted introgression. New sources of resistance, unrelated to previously characterized resistant lines, could carry unique QTL with large phenotypic effect on resistance to complement the previously identified QTL. To this end, CML69, derived from Caribbean Composite germplasm unrelated to previously released resistant lines, was used in QTL mapping to identify and characterize new resistance QTL. Seventeen QTL were identified, although some may be the same genetic region causing QTL identified in more than one environment, indicating that these QTL are stably expressed across environments. These QTL explained 1.8–12.6% each and jointly up to 55% of the phenotypic variation. The largest effect QTL, in particular the QTL in bin 4.08, are most likely the same as has been reported in QTL mapping studies of other resistant maize lines, suggesting both environmental and genetic stability. This stability will be very useful when these QTL are used in maize improvement programs, and single nucleotide polymorphism (SNP) markers linked to these QTL were identified to facilitate this use. CML69, and other lines related to it by pedigree, may make good parents for new aflatoxin resistant hybrids.Oluwaseun OgunolaJ. Spencer SmithWenwei XuDinakar BhattramakkiDaniel JeffersW. Paul WilliamsMarilyn L. WarburtonWileyarticleAgricultureSEnvironmental sciencesGE1-350ENAgrosystems, Geosciences & Environment, Vol 4, Iss 3, Pp n/a-n/a (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Agriculture S Environmental sciences GE1-350
spellingShingle	Agriculture S Environmental sciences GE1-350 Oluwaseun Ogunola J. Spencer Smith Wenwei Xu Dinakar Bhattramakki Daniel Jeffers W. Paul Williams Marilyn L. Warburton Characterization of a source of resistance to aflatoxin accumulation in maize
description	Abstract Aflatoxinproduced by the fungus Aspergillus flavus (Link:Fr) can accumulate in maize (Zea mays L.) and poses serious human health and economic concerns, especially in sub‐Saharan Africa. Genetic resistance against A. flavus infection and spread, and subsequent production of aflatoxin, is a key tool for reducing the problem. Some resistant inbred donor lines carry quantitative trait loci (QTL) for resistance that have a sufficiently large phenotypic effect to be used for marker assisted introgression. New sources of resistance, unrelated to previously characterized resistant lines, could carry unique QTL with large phenotypic effect on resistance to complement the previously identified QTL. To this end, CML69, derived from Caribbean Composite germplasm unrelated to previously released resistant lines, was used in QTL mapping to identify and characterize new resistance QTL. Seventeen QTL were identified, although some may be the same genetic region causing QTL identified in more than one environment, indicating that these QTL are stably expressed across environments. These QTL explained 1.8–12.6% each and jointly up to 55% of the phenotypic variation. The largest effect QTL, in particular the QTL in bin 4.08, are most likely the same as has been reported in QTL mapping studies of other resistant maize lines, suggesting both environmental and genetic stability. This stability will be very useful when these QTL are used in maize improvement programs, and single nucleotide polymorphism (SNP) markers linked to these QTL were identified to facilitate this use. CML69, and other lines related to it by pedigree, may make good parents for new aflatoxin resistant hybrids.
format	article
author	Oluwaseun Ogunola J. Spencer Smith Wenwei Xu Dinakar Bhattramakki Daniel Jeffers W. Paul Williams Marilyn L. Warburton
author_facet	Oluwaseun Ogunola J. Spencer Smith Wenwei Xu Dinakar Bhattramakki Daniel Jeffers W. Paul Williams Marilyn L. Warburton
author_sort	Oluwaseun Ogunola
title	Characterization of a source of resistance to aflatoxin accumulation in maize
title_short	Characterization of a source of resistance to aflatoxin accumulation in maize
title_full	Characterization of a source of resistance to aflatoxin accumulation in maize
title_fullStr	Characterization of a source of resistance to aflatoxin accumulation in maize
title_full_unstemmed	Characterization of a source of resistance to aflatoxin accumulation in maize
title_sort	characterization of a source of resistance to aflatoxin accumulation in maize
publisher	Wiley
publishDate	2021
url	https://doaj.org/article/19e96ab03f7d4992b227eb103e8e6c8f
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Characterization of a source of resistance to aflatoxin accumulation in maize

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