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Mapping Quantitative Trait Loci for Partial Resistance to Powdery Mildew in an Australian Barley Population

Hickey, L. T. and Lawson, W. and Platz, G. J. and Fowler, R. A. and Arief, V. and Dieters, M. and German, S. and Fletcher, S. and Park, R. F. and Singh, D. and Pereyra, S. and Franckowiak, J. (2012) Mapping Quantitative Trait Loci for Partial Resistance to Powdery Mildew in an Australian Barley Population. Crop Science, 52 (3). pp. 1021-1032. ISSN 0011-183X

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Article Link(s): http://dx.doi.org/10.2135/cropsci2011.10.0535

Abstract

Genomic regions influencing resistance to powdery mildew [Blumeria graminis (DC.) E.O. Speer f. sp. hordei Em. Marchal] were detected in a doubled haploid (DH) barley (Hordeum vulgare L.) population derived from a cross between the breeding line ND24260 and cultivar Flagship when evaluated across four field environments in Australia and Uruguay. Significant quantitative trait loci (OIL) for resistance to B. graminis were detected on six of the seven chromosomes (1H, 2H, 3H, 4H, 5H, and 7H). A QTL with large effect donated by ND24260 mapped to the short arm of chromosome 1H (1 HS) conferring near immunity to B. graminis in Australia but was ineffective in Uruguay. Three OIL donated by Flagship contributed partial resistance to B. graminis and were detected in at least two environments. These OIL were mapped to chromosomes 3H, 4H, and 5H (5HS) accounting for up to 18.6, 3.4, and 8.8% phenotypic variation, respectively. The 5HS QTL contributed partial resistance to B. graminis in all field environments in both Australia and Uruguay and aligned with the genomic region of Rph20, a gene conferring adult plant resistance (APR) to leaf rust (Puccinia hordei Otth), which is found in some cultivars having Vada' or 'Emir' in their parentage. Selection for favorable marker haplotypes within the 3H, 4H, and 5H QTL regions can be performed even in the presence of single (major) gene resistance. Pyramiding such QTL may provide an effective and potentially durable form of resistance to B. graminis.

Item Type:Article
Business groups:Crop and Food Science
Additional Information:Hickey, Lee T. Lawson, Wendy Platz, Greg J. Fowler, Ryan A. Arief, Vivi Dieters, Mark German, Silvia Fletcher, Susan Park, Robert F. Singh, Davinder Pereyra, Silvia Franckowiak, Jerome
Subjects:Plant culture > Field crops > Barley
Plant pests and diseases > Individual or types of plants or trees > Barley
Science > Botany > Genetics
Deposited On:09 Apr 2014 04:50
Last Modified:09 Apr 2014 04:50

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