Quantitative trait loci analysis for resistance to Cephalosporium stripe, a vascular wilt disease of wheat

Quincke, M C and et al, . (2011) Quantitative trait loci analysis for resistance to Cephalosporium stripe, a vascular wilt disease of wheat. TAG Theoretical and Applied Genetics, 122 (7). pp. 1339-1349. ISSN 1432-2242

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Cephalosporium stripe, caused by Cephalosporium gramineum, can cause severe loss of wheat (Triticum aestivum L.) yield and grain quality and can be an important factor limiting adoption of conservation tillage practices. Selecting for resistance to Cephalosporium stripe is problematic; however, as optimum conditions for disease do not occur annually under natural conditions, inoculum levels can be spatially heterogeneous, and little is known about the inheritance of resistance. A population of 268 recombinant inbred lines (RILs) derived from a cross between two wheat cultivars was characterized using field screening and molecular markers to investigate the inheritance of resistance to Cephalosporium stripe. Whiteheads (sterile heads caused by pathogen infection) were measured on each RIL in three field environments under artificially inoculated conditions. A linkage map for this population was created based on 204 SSR and DArT markers. A total of 36 linkage groups were resolved, representing portions of all chromosomes except for chromosome 1D, which lacked a sufficient number of polymorphic markers. Quantitative trait locus (QTL) analysis identified seven regions associated with resistance to Cephalosporium stripe, with approximately equal additive effects. Four QTL derived from the more susceptible parent (Brundage) and three came from the more resistant parent (Coda), but the cumulative, additive effect of QTL from Coda was greater than that of Brundage. Additivity of QTL effects was confirmed through regression analysis and demonstrates the advantage of accumulating multiple QTL allelesto achieve high levels of resistance

Item Type: Article
Subjects: Others > Wheat
Depositing User: Mr Sanat Kumar Behera
Date Deposited: 17 Feb 2012 04:42
Last Modified: 17 Feb 2012 04:42
URI: http://oar.icrisat.org/id/eprint/5530
Official URL: http://dx.doi.org/10.1007/s00122-011-1535-6
Funders: United States Agency for International Development
Acknowledgement: We thank Karl Rhinhart and Erling Jacobsen for excellent management of the field plots. This research was supported by a USDA STEEP grant
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