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Genetic Resources for Disease Resistance in Wheat

characterization and utilization

Hysing, Shu-Chin (2007). Genetic Resources for Disease Resistance in Wheat. Diss. (sammanfattning/summary) Alnarp : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2007:9
ISBN 978-91-576-7308-4
[Doctoral thesis]

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Bread wheat is affected by many diseases that cause yield and quality losses. The incorporation of resistance genes is a user- and environmentally friendly method to manage disease. It is highly desirable that the resistance is durable and that the genes have a positive or no influence on agronomic performance. The characterization of genetic resources for resistance is a prerequisite for their utilization in plant breeding. The aim of the present thesis was to characterize resistance against the fungal diseases leaf rust and powdery mildew in (i) bread wheat landraces and cultivars, and (ii) a wheat-rye hybrid carrying a T2BS.2RL chromosome translocation. The methods included pathological tests, field trials and molecular DNA markers. Nine leaf rust seedling resistance genes were identified in 47 of 84 North European wheat cultivars. Seven powdery mildew seedling resistance genes were identified in 21 of 155 Nordic landraces and cultivars. More than 50 Nordic seedling susceptible wheat accessions displayed high levels of adult plant powdery mildew resistance that could be effective in disease control. The genetic diversity among 198 Nordic wheat landraces and cultivars from before 1900 to 2003 was studied using retrotransposon-based S-SAP markers. Diversity was clearly separated between spring and winter wheat. The genetic diversity decreased during the early period of plant breeding, increased after the late 1960s and resulted in a net gain. Useful characters could be present in landraces that are not found in modern wheat material. The 2RL rye segment in the wheat-rye hybrid T2BS.2RL, SLU was found to confer seedling resistance against powdery mildew, leaf rust, stem rust; and adult plant resistance against stripe rust. The 2RL was associated with two to three days later flowering time and an increased number of spikelets per spike. It had no significant effect on several agriculturally important characters including yield, fertility and lodging. Microsatellite mapping and linkage analysis identified a major QTL for powdery mildew resistance located on 2RL. The T2BS.2RL appears promising for wheat improvement. The wheat-rye hybrid and the wheat accessions with high levels of resistance constitute genetic resources that could provide durable and effective disease control in wheat.

Authors/Creators:Hysing, Shu-Chin
Title:Genetic Resources for Disease Resistance in Wheat
Subtitle:characterization and utilization
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2007
Number of Pages:57
ALLI. Hysing, S.-C., Singh, R.P., Huerta-Espino, J., Merker, A., Liljeroth, E. & Diaz, O. 2006. Leaf rust (Puccinia triticina) resistance in wheat (Triticum aestivum) cultivars grown in Northern Europe 1992 – 2002. Hereditas 143, 1-14. II. Hysing, S.C., Merker, A., Liljeroth, E., Koebner, R.M.D., Zeller, F.J. & Hsam, S.L.K. Powdery mildew resistance in Nordic bread wheat cultivars and landraces during a century of breeding. (Submitted) III. Hysing, S.C., Säll, T., Nybom, H., Liljeroth, E., Merker, A., Orford, S. & Koebner, R.M.D. Temporal diversity changes among 198 Nordic bread wheat landraces and cultivars detected by retrotransposon-based S-SAP analysis. (Manuscript) IV. Hysing, S.C., Hsam, S.L.K., Singh, R.P., Huerta-Espino, J., Boyd, L.A., Koebner, R.M.D., Cambron, S., Johnson, J.W., Bland, D.E., Liljeroth, E. & Merker, A. 2007. Agronomic Performance and Multiple Disease Resistance in T2BS.2RL Wheat-Rye Translocation Lines. Crop Science. In Press. V. Hysing, S.C., Hsam, S.L.K., Merker, A. & Röder, M.S. Mapping of powdery mildew and leaf rust resistance genes on rye chromosome 2RL in wheat-rye translocation lines. (Submitted)
Place of Publication:Alnarp
ISBN for printed version:978-91-576-7308-4
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:triticum aestivum, genetic resources, mildews, rusts, translocation, microsatellites
Keywords:Triticum aestivum, genetic resources, powdery mildew, leaf rust, genetic diversity, wheat, rye, microsatellites, retrotransposon, translocation
Permanent URL:
ID Code:1341
Department:?? 4806 ??
Deposited By: Shu-Chin Hysing
Deposited On:14 Feb 2007 00:00
Metadata Last Modified:02 Dec 2014 10:11

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