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Mapping spot blotch resistance genes in four barley populations

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Bovill, J., Lehmensiek, A., Sutherland, M. W., Platz, G. J., Usher, T., Franckowiak, J. and Mace, E. (2010) Mapping spot blotch resistance genes in four barley populations. Molecular Breeding, 26 (4). pp. 653-666. ISSN 1380-3743

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Article Link(s): https://doi.org/10.1007/s11032-010-9401-9

Abstract

Bipolaris sorokiniana (teleomorph: Cochliobolus sativus) is the fungal pathogen responsible for spot blotch in barley (Hordeum vulgare L.) and occurs worldwide in warmer, humid growing conditions. Current Australian barley varieties are largely susceptible to this disease and attempts are being made to introduce sources of resistance from North America. In this study we have compared chromosomal locations of spot blotch resistance reactions in four North American two-rowed barley lines; the North Dakota lines ND11231-12 and ND11231-11 and the Canadian lines TR251 and WPG8412-9-2-1. Diversity arrays technology-based PCR, expressed sequence tag and SSR markers have been mapped across four populations derived from crosses between susceptible parental lines and these four resistant parents to determine the location of resistance loci. Quantitative trait loci (QTL) conferring resistance to spot blotch in adult plants (APR) were detected on chromosomes 3HS and 7HS. In contrast, seedling resistance (SLR) was controlled solely by a locus on chromosome 7HS. The phenotypic variance explained by the APR QTL on 3HS was between 16 and 25% and the phenotypic variance explained by the 7HS APR QTL was between 8 and 42% across the four populations. The SLR QTL on 7HS explained between 52 and 64% of the phenotypic variance. An examination of the pedigrees of these resistance sources supports the common identity of resistance in these lines and indicates that only a limited number of major resistance loci are available in current two-rowed germplasm.

Item Type:Article
Business groups:Crop and Food Science
Subjects:Science > Botany > Genetics
Plant culture > Field crops > Barley
Plant pests and diseases
Deposited On:17 Jan 2023 02:54
Last Modified:17 Jan 2023 02:54

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