Genomic regions associated with the nitrogen limitation response revealed in a global wheat core collection

Modern wheat (Triticum aestivum L.) varieties in Western Europe have mainly been bred, and selected in conditions where high levels of nitrogen-rich fertilizer are applied. However, high input crop management has greatly increased the risk of nitrates leaching into groundwater with negative impacts...

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Bibliographic Details
Published in:	Theoretical and applied genetics Vol. 126; no. 3; pp. 805 - 822
Main Authors:	Bordes, Jacques, Ravel, C, Jaubertie, J. P, Duperrier, B, Gardet, O, Heumez, E, Pissavy, A. L, Charmet, G, Le Gouis, J, Balfourier, F
Format:	Journal Article
Language:	English
Published:	Berlin/Heidelberg Springer-Verlag 01-03-2013 Springer Springer Nature B.V Springer Verlag
Subjects:	Agricultural production Agricultural sciences Agriculture Biochemistry Biomedical and Life Sciences Biotechnology Breeding Chromosome Mapping Chromosomes Chromosomes, Plant - genetics crop management cultivars Environment environmental impact Europe Fertilizers genes Genes, Plant Genetic aspects Genetic Loci Genetic Markers Genetic screening Genetic Variation Genomics Genotype grain protein grain yield groundwater heading leaching Life Sciences Methods Nitrates Nitrogen Nitrogen - metabolism nitrogen fertilizers Original Paper Phenotype Physiological aspects Plant Biochemistry Plant Breeding/Biotechnology Plant Genetics and Genomics protein content Proteins Quantitative genetics Quantitative trait loci risk Seasons Triticum - genetics Triticum - metabolism Triticum aestivum Wheat yield components Western European region Europe France Western Europe Favorable Allele Grain Yield Core Collection Glutamine Synthetase Simple Sequence Repeat Marker HEXAPLOWHEAT TRITICUM-AESTIVUM L GRAIN PROTEIN-CONTENT RYE TRANSLOCATION USE EFFICIENCY POPULATION-STRUCTURE AGRONOMIC TRAITS BREAD-WHEAT QUANTITATIVE GENETICS WINTER-WHEAT
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Summary:	Modern wheat (Triticum aestivum L.) varieties in Western Europe have mainly been bred, and selected in conditions where high levels of nitrogen-rich fertilizer are applied. However, high input crop management has greatly increased the risk of nitrates leaching into groundwater with negative impacts on the environment. To investigate wheat nitrogen tolerance characteristics that could be adapted to low input crop management, we supplied 196 accessions of a wheat core collection of old and modern cultivars with high or moderate amounts of nitrogen fertilizer in an experimental network consisting of three sites and 2 years. The main breeding traits were assessed including grain yield and grain protein content. The response to nitrogen level was estimated for grain yield and grain number per m² using both the difference and the ratio between performance at the two input levels and the slope of joint regression. A large variability was observed for all the traits studied and the response to nitrogen level. Whole genome association mapping was carried out using 899 molecular markers taking into account the five ancestral group structure of the collection. We identified 54 main regions involving almost all chromosomes that influence yield and its components, plant height, heading date and grain protein concentration. Twenty-three regions, including several genes, spread over 16 chromosomes were involved in the response to nitrogen level. These chromosomal regions may be good candidates to be used in breeding programs to improve the performance of wheat varieties at moderate nitrogen input levels.
Bibliography:	http://dx.doi.org/10.1007/s00122-012-2019-z ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0040-5752 1432-2242
DOI:	10.1007/s00122-012-2019-z