Mapping QTL conferring resistance in maize to gray leaf spot disease caused by Cercospora zeina

Show simple item record Berger, David Kenneth Carstens, Maryke Korsman, Jeanne Nicola Middleton, Felix Kloppers, Frederik J. Tongoona, Pangirayi Myburg, Alexander Andrew 2014-08-14T07:25:29Z 2014-08-14T07:25:29Z 2014-05-22
dc.description.abstract BACKGROUND: Gray leaf spot (GLS) is a globally important foliar disease of maize. Cercospora zeina, one of the two fungal species that cause the disease, is prevalent in southern Africa, China, Brazil and the eastern corn belt of the USA. Identification of QTL for GLS resistance in subtropical germplasm is important to support breeding programmes in developing countries where C. zeina limits production of this staple food crop. RESULTS: A maize RIL population (F7:S6) from a cross between CML444 and SC Malawi was field-tested under GLS disease pressure at five field sites over three seasons in KwaZulu-Natal, South Africa. Thirty QTL identified from eleven field trials (environments) were consolidated to seven QTL for GLS resistance based on their expression in at least two environments and location in the same core maize bins. Four GLS resistance alleles were derived from the more resistant parent CML444 (bin 1.10, 4.08, 9.04/9.05, 10.06/10.07), whereas the remainder were from SC Malawi (bin 6.06/6.07, 7.02/7.03, 9.06). QTLs in bin 4.08 and bin 6.06/6.07 were also detected as joint QTLs, each explained more than 11% of the phenotypic variation, and were identified in four and seven environments, respectively. Common markers were used to allocate GLS QTL from eleven previous studies to bins on the IBM2005 map, and GLS QTL “hotspots” were noted. Bin 4.08 and 7.02/7.03 GLS QTL from this study overlapped with hotspots, whereas the bin 6.06/6.07 and bin 9.06 QTLs appeared to be unique. QTL for flowering time (bin 1.07, 4.09) in this population did not correspond to QTL for GLS resistance. CONCLUSIONS: QTL mapping of a RIL population from the subtropical maize parents CML444 and SC Malawi identified seven QTL for resistance to gray leaf spot disease caused by C. zeina. These QTL together with QTL from eleven studies were allocated to bins on the IBM2005 map to provide a basis for comparison. Hotspots of GLS QTL were identified on chromosomes one, two, four, five and seven, with QTL in the current study overlapping with two of these. Two QTL from this study did not overlap with previously reported QTL. en_US
dc.description.librarian am2014 en_US
dc.description.sponsorship The Technology Innovation Agency (TIA), the National Research Foundation (NRF) and the Genomics Research Institute of the University of Pretoria (UP), South Africa. en_US
dc.description.uri en_US
dc.identifier.citation Berger, DK, Carstens, M, Korsman, JN, Middleton, F, Kloppers, FJ, Tongoona, P & Myburg, A 2014, 'Mapping QTL conferring resistance in maize to gray leaf spot disease caused by Cercospora zeina', BMC Genetics, vol. 15, art. 60, pp. 1-12. en_US
dc.identifier.issn 1471-2156
dc.identifier.other 10.1186/1471-2156-15-60
dc.language.iso en en_US
dc.publisher BioMed Central en_US
dc.rights © 2014 Berger et al.; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License en_US
dc.subject Grey leaf spot en_US
dc.subject Cercospora en_US
dc.subject Maize en_US
dc.subject Corn en_US
dc.subject Gray leaf spot (GLS) en_US
dc.subject Quantitative trait loci (QTL) en_US
dc.title Mapping QTL conferring resistance in maize to gray leaf spot disease caused by Cercospora zeina en_US
dc.type Article en_US

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