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Int. J. Mol. Sci. 2018, 19(9), 2666; https://doi.org/10.3390/ijms19092666

Identification of Novel Quantitative Trait Loci Linked to Crown Rot Resistance in Spring Wheat

1
Global Wheat Program, International Maize and Wheat Improvement Center (CIMMYT), Ankara 06511, Turkey
2
International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal 6-641, Mexico DF06600, Mexico
3
International Winter Wheat Improvement Program (IWWIP), International Maize and Wheat Improvement Center (CIMMYT), Ankara 06511, Turkey
4
Institute of Biotechnology and Genetic Engineering, The University of Agriculture Peshawar, Peshawar 25000, Pakistan
5
Grains Research and Development Corporation (GRDC), P.O. Box 5367, Kingston, ACT 2604, Australia
6
Institute of Bio- and Geosciences, Plant Sciences (IBG-2), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 25 June 2018 / Revised: 17 August 2018 / Accepted: 25 August 2018 / Published: 8 September 2018
(This article belongs to the Special Issue Plant Defense Genes Against Biotic Stresses)
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Abstract

Crown rot (CR), caused by various Fusarium species, is a major disease in many cereal-growing regions worldwide. Fusarium culmorum is one of the most important species, which can cause significant yield losses in wheat. A set of 126 advanced International Maize and Wheat Improvement Center (CIMMYT) spring bread wheat lines were phenotyped against CR for field crown, greenhouse crown and stem, and growth room crown resistance scores. Of these, 107 lines were genotyped using Diversity Array Technology (DArT) markers to identify quantitative trait loci linked to CR resistance by genome-wide association study. Results of the population structure analysis grouped the accessions into three sub-groups. Genome wide linkage disequilibrium was large and declined on average within 20 cM (centi-Morgan) in the panel. General linear model (GLM), mixed linear model (MLM), and naïve models were tested for each CR score and the best model was selected based on quarantine-quarantine plots. Three marker-trait associations (MTAs) were identified linked to CR resistance; two of these on chromosome 3B were associated with field crown scores, each explaining 11.4% of the phenotypic variation and the third MTA on chromosome 2D was associated with greenhouse stem score and explained 11.6% of the phenotypic variation. Together, these newly identified loci provide opportunity for wheat breeders to exploit in enhancing CR resistance via marker-assisted selection or deployment in genomic selection in wheat breeding programs. View Full-Text
Keywords: Fusarium culmorum; crown rot resistance; genome-wide association study; structure; quantitative trait loci; Triticum aestivum Fusarium culmorum; crown rot resistance; genome-wide association study; structure; quantitative trait loci; Triticum aestivum
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Erginbas-Orakci, G.; Sehgal, D.; Sohail, Q.; Ogbonnaya, F.; Dreisigacker, S.; Pariyar, S.R.; Dababat, A.A. Identification of Novel Quantitative Trait Loci Linked to Crown Rot Resistance in Spring Wheat. Int. J. Mol. Sci. 2018, 19, 2666.

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