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Agronomy 2019, 9(3), 154; https://doi.org/10.3390/agronomy9030154

Assessing the Individual and Combined Effects of QTL for Adult Plant Stripe Rust Resistance Derived from Cappelle-Desprez

1
Department of Plant Sciences, University of the Free State, PO Box 339, Bloemfontein 9300, South Africa
2
CenGen (Pty) Ltd., 78 Fairbairn Street, Worcester 6850, South Africa
3
Department of Genetics, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa
4
National Institute of Agricultural Botany, Huntingdon Road, Cambridge CB3 0LE, UK
*
Author to whom correspondence should be addressed.
Received: 4 February 2019 / Revised: 4 March 2019 / Accepted: 12 March 2019 / Published: 25 March 2019
(This article belongs to the Special Issue Cereal Rust Management for Improving Global Food Security)
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Abstract

The release of commercial wheat cultivars resistant to stripe rust, caused by Puccinia striiformis f. sp. tritici (Pst), remains one of the primary objectives in many breeding programs. Previous studies of adult plant resistance derived from the winter wheat cultivar Cappelle-Desprez identified the quantitative trait loci (QTL) QYr.ufs-2A, QYr.ufs-2D, QYr.ufs-5B and QYr.ufs-6D to affect stripe rust under South African conditions. Phenotypic field assessment, fluorescence microscopy and molecular analysis were used to characterise recombinant inbred lines differing in number and combinations of these QTL. Besides the confirmation of enhanced resistance through co-occurring resistance loci, varying levels of defence, conditioned by different QTL combinations were observed. Carriers of QYr.ufs-2A or QYr.ufs-2D, accompanied by at least one other QTL, exhibited higher resistance levels than lines with a single QTL. The knowledge gained in this study will help wheat breeders to develop cultivars with more diverse combinations and potentially more durable sources of stripe rust resistance. View Full-Text
Keywords: Puccinia striiformis; Triticum aestivum; resistance; quantitative trait loci Puccinia striiformis; Triticum aestivum; resistance; quantitative trait loci
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Maree, G.J.; Prins, R.; Boyd, L.A.; Castelyn, H.D.; Bender, C.M.; Boshoff, W.H.; Pretorius, Z.A. Assessing the Individual and Combined Effects of QTL for Adult Plant Stripe Rust Resistance Derived from Cappelle-Desprez. Agronomy 2019, 9, 154.

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