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. 2014 Apr 28;9(4):e96011.
doi: 10.1371/journal.pone.0096011. eCollection 2014.

QTL conferring fusarium crown rot resistance in the elite bread wheat variety EGA Wylie

Zhi Zheng  1 , Andrzej Kilian  2 , Guijun Yan  3 , Chunji Liu  4
Affiliations

QTL conferring fusarium crown rot resistance in the elite bread wheat variety EGA Wylie

Zhi Zheng et al. PLoS One. .

Abstract

Fusarium crown rot (FCR) is one of the most damaging cereal diseases in semi-arid regions worldwide. The genetics of FCR resistance in the bread wheat (Triticum eastivum L.) variety EGA Wylie, the most resistant commercial variety available, was studied by QTL mapping. Three populations of recombinant inbred lines were developed with this elite variety as the resistant parent. Four QTL conferring FCR resistance were detected and resistance alleles of all of them were derived from the resistant parent EGA Wylie. One of these loci was located on the short arm of chromosome 5D (designated as Qcrs.cpi-5D). This QTL explains up to 31.1% of the phenotypic variance with an LOD value of 9.6. The second locus was located on the long arm of chromosome 2D (designated as Qcrs.cpi-2D) and explained up to 20.2% of the phenotypic variance with an LOD value of 4.5. Significant effects of both Qcrs.cpi-5D and Qcrs.cpi-2D were detected in each of the three populations assessed. Another two QTL (designated as Qcrs.cpi-4B.1 and Qcrs.cpi-4B.2, respectively) were located on the short arm of chromosome 4B. These two QTL explained up to 16.9% and 18.8% of phenotypic variance, respectively. However, significant effects of Qcrs.cpi-4B.1 and Qcrs.cpi-4B.2 were not detected when the effects of plant height was accounted for by covariance analysis. The elite characteristics of this commercial variety should facilitate the incorporation of the resistance loci it contains into breeding programs.

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Conflict of interest statement

Competing Interests: The authors acknowledge the help and technical support from the employees of Diversity Arrays Technology Pty. Ltd. AK is an employee of Diversity Arrays Technology Pty Ltd, which offers genome profiling service using the technologies described in this publication. There are no patents, products in development or marketed products to declare. This does not alter our adherence to all the PLOS ONE policies on sharing data and materials.

Figures

Figure 1
Figure 1. QTL conferring FCR resistance detected with interval mapping (IM) on chromosome 5D in the population of EGA Wylie/Sumai3.
The LOD values from each centimorgan of the chromosome were plotted against the chromosome, and the threshold LOD value (2.9) based on permutation test for declaring the presence of a QTL was indicated by a dotted line.
Figure 2
Figure 2. QTL conferring FCR resistance detected with interval mapping (IM) on chromosome arm 2DL in the population of EGA Wylie/Sumai3.
The LOD values from each centimorgan of the chromosome were plotted against the chromosome, and the threshold LOD value (2.9) based on permutation test for declaring the presence of a QTL was indicated by a dotted line.
Figure 3
Figure 3. LOD values of Qcrs.cpi-4B.1 and Qcrs.cpi-4B.2 obtained from combined data of the three FCR trials pre- (combined) and post-adjustment by plant height (PH-adjusted).
See this image and copyright information in PMC

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