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- Title
Genetic analysis and molecular mapping of resistance to Puccinia striiformis f. sp. pseudo-hordei in common wheat.
- Authors
Dracatos, P. M.; Haghdoust, R.; Singh, D.; Park, R. F.
- Abstract
This is the first genetic study reporting on the interaction and molecular mapping of resistance to the barley grass stripe rust pathogen ( Puccinia striiformis f. sp. pseudo-hordei, Psph) in common wheat. Seedlings of 638 wheat accessions were tested and it was determined that wheat is a near-nonhost to Psph based on rare susceptibility observed in <2% of commercial cultivars and <5% of wheat landraces. As previously observed for P. striiformis f. sp. tritici (Pst), the Australian cultivar Teal was highly susceptible to Psph. In contrast, a selection of cv. Avocet carrying complementary resistance genes Yr73 and Yr74 (Avocet R; AvR) was resistant. The Teal × AvR (T/A) doubled haploid ( DH) population was used to map resistance in AvR to Psph. Infection types on the T/A DH lines inoculated with Psph and Pst indicated that all DH lines carrying both Yr73 and Yr74 were also resistant to Psph; however, fewer DH lines were susceptible to Psph than expected, suggesting the resistance was more complex. QTL analysis using 9053 DArT-Seq markers determined that resistance to Psph was polygenically inherited and mapped to chromosomes 3A, 3D, 4A and 5B. The 3 DL and 5 BL markers co-located with Yr73 and Yr74, suggesting an overlap between host and non-host resistance mechanisms.
- Subjects
PUCCINIA striiformis; WHEAT diseases &; pests; STRIPE rust; PLANT genetics; PLANT resistance to viruses; NATURAL immunity; BARLEY industry; GENETICS
- Publication
Plant Pathology, 2017, Vol 66, Issue 2, p285
- ISSN
0032-0862
- Publication type
Article
- DOI
10.1111/ppa.12580