Association mapping for cold tolerance in two large maize inbred panels
2016
Revilla, Pedro | Manuel Rodriguez, Victor | Ordas, Amando | Rincent, Renaud | Charcosset, Alain | Giauffret, Catherine | Melchinger, Albrecht E. | Schoen, Chris-Carolin | Bauer, Eva | Altmann, Thomas | Brunel, Dominique | Moreno-Gonzalez, Jesus | Campo, Laura | Ouzunova, Milena | Alvarez, Angel | Ruiz de Galarreta, Jose Ignacio | Laborde, Jacques | Ana Malvar, Rosa | Mision Biologica de Galicia (MBG) ; Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain] (CSIC) | Génétique Quantitative et Evolution - Le Moulon (Génétique Végétale) (GQE-Le Moulon) ; Institut National de la Recherche Agronomique (INRA)-Université Paris-Sud - Paris 11 (UP11)-AgroParisTech-Centre National de la Recherche Scientifique (CNRS) | Stress Abiotiques et Différenciation des Végétaux Cultivés (SADV) ; Institut National de la Recherche Agronomique (INRA)-Université de Lille, Sciences et Technologies | Institute of Plant Breeding, Seed Science and Population Genetics ; Universität Hohenheim = University of Hohenheim | Technische Universität Munchen - Technical University Munich - Université Technique de Munich (TUM) | Leibniz Institute of Plant Genetics and Crop Plant Research [Gatersleben] (IPK-Gatersleben) | Etude du Polymorphisme des Génomes Végétaux (EPGV) ; Institut National de la Recherche Agronomique (INRA) | Centro de Investigaciones Agrarias de Mabegondo (CIAM) | KWS SAAT SE & Co.KGaA | Estación Experimental de Aula Dei ; Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain] (CSIC) | Instituto Vasco de Investigación y Desarrollo Agrario [Derio] (NEIKER) | Unité expérimentale du maïs (BORDX ST-MARTIN UE) ; Institut National de la Recherche Agronomique (INRA) | Spanish Ministry of Science and Innovation [EUI2008-03642, EUI2008-03635]; Spanish Plan for Research and Development [AGL2013-48852-C3-1-R]; French National Agency for Research (ANR, Ministry of High Education and Research); German Federal Ministry of Education and Research [0315461A-D] | Alison Cuff
International audience
Mostrar más [+] Menos [-]Inglés. Background: Breeding for cold tolerance in maize promises to allow increasing growth area and production in temperate zones. The objective of this research was to conduct genome-wide association analyses (GWAS) in temperate maize inbred lines and to find strategies for pyramiding genes for cold tolerance. Two panels of 306 dent and 292 European flint maize inbred lines were evaluated per se and in testcrosses under cold and control conditions in a growth chamber. We recorded indirect measures for cold tolerance as the traits number of days from sowing to emergence, relative leaf chlorophyll content or quantum efficiency of photosystem II. Association mapping for identifying genes associated to cold tolerance in both panels was based on genotyping with 49,585 genome-wide single nucleotide polymorphism (SNP) markers. Results: We found 275 significant associations, most of them in the inbreds evaluated per se, in the flint panel, and under control conditions. A few candidate genes coincided between the current research and previous reports. A total of 47 flint inbreds harbored the favorable alleles for six significant quantitative trait loci (QTL) detected for inbreds per se evaluated under cold conditions, four of them had also the favorable alleles for the main QTL detected from the testcrosses. Only four dent inbreds (EZ47, F924, NK807 and PHJ40) harbored the favorable alleles for three main QTL detected from the evaluation of the dent inbreds per se under cold conditions. There were more QTL in the flint panel and most of the QTL were associated with days to emergence and FPSII. Conclusions: These results open new possibilities to genetically improve cold tolerance either with genome-wide selection or with marker assisted selection.
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