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Spot form of net blotch resistance in barley is under complex genetic control

Wang, Xuemin and Mace, Emma S. and Platz, Gregory J. and Hunt, Colleen H. and Hickey, Lee T. and Franckowiak, Jerome D. and Jordan, David R. (2015) Spot form of net blotch resistance in barley is under complex genetic control. Theoretical and Applied Genetics, 128 (3). p. 489. ISSN 0040-5752

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Article Link(s): http://dx.doi.org/10.1007/s00122-014-2447-z

Publisher URL: http://link.springer.com/article/10.1007%2Fs00122-014-2447-z

Abstract

Key message: Evaluation of resistance toPyrenophora teresf.maculatain barley breeding populations via association mapping revealed a complex genetic architecture comprising a mixture of major and minor effect genes. Abstract: In the search for stable resistance to spot form of net blotch (Pyrenophora teres f. maculata, SFNB), association mapping was conducted on four independent barley (Hordeum vulgare L.) breeding populations comprising a total of 898 unique elite breeding lines from the Northern Region Barley Breeding Program in Australia for discovery of quantitative trait loci (QTL) influencing resistance at seedling and adult plant growth stages. A total of 29 significant QTL were validated across multiple breeding populations, with 22 conferring resistance at both seedling and adult plant growth stages. The remaining 7 QTL conferred resistance at either seedling (2 QTL) or adult plant (5 QTL) growth stages only. These 29 QTL represented 24 unique genomic regions, of which five were found to co-locate with previously identified QTL for SFNB. The results indicated that SFNB resistance is controlled by a large number of QTL varying in effect size with large effects QTL on chromosome 7H. A large proportion of the QTL acted in the same direction for both seedling and adult responses, suggesting that phenotypic selection for SFNB resistance performed at either growth stage could achieve adequate levels of resistance. However, the accumulation of specific resistance alleles on several chromosomes must be considered in molecular breeding selection strategies.

Item Type:Article
Business groups:Crop and Food Science
Keywords:Chromosomes Genes Mapping Association mapping Barley (hordeum vulgare l.) Breeding populations Genetic architecture Molecular breeding Plant growth stages Quantitative trait locus Specific resistances Population statistics Hordeum Hordeum vulgare subsp. vulgare Pyrenophora teres f. maculata
Subjects:Plant culture > Field crops > Barley
Science > Botany > Genetics
Plant pests and diseases
Deposited On:18 Mar 2015 02:33
Last Modified:08 Jun 2015 16:03

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