Intercontinental trials reveal stable QTL for Northern corn leaf blight resistance in Europe and in Brazil
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ORIGINAL ARTICLE
Intercontinental trials reveal stable QTL for Northern corn leaf blight resistance in Europe and in Brazil Ana L. Galiano‑Carneiro1 · Bettina Kessel2 · Thomas Presterl2 · Thomas Miedaner1 Received: 24 April 2020 / Accepted: 7 September 2020 © The Author(s) 2020
Abstract Key message NCLB is the most devastating leaf disease in European maize, and the introduction of Brazilian resistance donors can efficiently increase the resistance levels of European maize germplasm. Abstract Northern corn leaf blight (NCLB) is one of the most devastating leaf pathogens in maize (Zea mays L.). Maize cultivars need to be equipped with broad and stable NCLB resistance to cope with production intensification and climate change. Brazilian germplasm is a great source to increase low NCLB resistance levels in European materials, but little is known about their effect in European environments. To investigate the usefulness of Brazilian germplasm as NCLB resistance donors, we conducted multi-parent QTL mapping, evaluated the potential of marker-assisted selection as well as genome-wide selection of 742 F 1-derived DH lines. The line per se performance was evaluated in one location in Brazil and six locationby-year combinations (= environments) in Europe, while testcrosses were assessed in two locations in Brazil and further 10 environments in Europe. Jointly, we identified 17 QTL for NCLB resistance explaining 3.57–30.98% of the genotypic variance each. Two of these QTL were detected in both Brazilian and European environments indicating the stability of these QTL in contrasting ecosystems. We observed moderate to high genomic prediction accuracies between 0.58 and 0.83 depending on population and continent. Collectively, our study illustrates the potential use of tropical resistance sources to increase NCLB resistance level in applied European maize breeding programs.
Introduction Maize (Zea mays L.) is the worldwide most productive crop with 1.12 harvested billion metric tons in 2018/19 (USDA/ IPAD 2020). Projections estimate more than 183 million metric tons production growth in the next decade (OECD/ FAO 2019) seeking to attend the increasing demand for food, feed and fuel. In Europe, especially in Germany, maize production increased exponentially since the end of the 1970s and maize is nowadays the second largest crop in Communicated by Thomas Lubberstedt. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00122-020-03682-1) contains supplementary material, which is available to authorized users. * Thomas Miedaner miedaner@uni‑hohenheim.de 1
State Plant Breeding Institute, University of Hohenheim, Stuttgart, Germany
Kleinwanzlebener Saatzucht (KWS) KWS SAAT SE & Co. KGaA, Einbeck, Germany
2
acreage, where about 85% of the production is designated to silage and biogas maize and 15% to kernel maize (Bundessortenamt 2019). NCLB was firstly observed in southern Germany in 1995 (Welz et al. 1996; Welz 1998; Hanekamp 2016) and is nowadays the most devastati
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