Advertisement

Theoretical and Applied Genetics

, Volume 98, Issue 6–7, pp 903–912 | Cite as

Quantitative trait loci for resistance against powdery mildew in a segregating wheat×spelt population

  • M. Keller
  • B. Keller
  • G. Schachermayr
  • M. Winzeler
  • J. E. Schmid
  • P. Stamp
  • M. M. Messmer

Abstract

 Powdery mildew is one of the major diseases of wheat in regions with a maritime or semi-continental climate and can strongly affect grain yield. The attempt to control powdery mildew with major resistance genes (Pm genes) has not provided a durable resistance. Breeding for quantitative resistance to powdery mildew is more promising, but is difficult to select on a phenotypic basis. In this study, we mapped and characterised quantitative trait loci (QTLs) for adult-plant powdery mildew resistance in a segregating population of 226 recombinant inbred lines derived from the cross of the Swiss wheat variety Forno with the Swiss spelt variety Oberkulmer. Forno possibly contains the Pm5 gene and showed good adult-plant resistance in the field. Oberkulmer does not have any known Pm gene and showed a moderate susceptible reaction. Powdery mildew resistance was assessed in field trials at two locations in 1995 and at three locations in 1996. The high heritability (h2=0.97) for powdery mildew resistance suggests that the environmental influence did not affect the resistance phenotype to a great extent. QTL analysis was based on a genetic map containing 182 loci with 23 linkage groups (2469 cM). With the method of composite interval mapping 18 QTLs for powdery mildew resistance were detected, explaining 77% of the phenotypic variance in a simultaneous fit. Two QTLs with major effects were consistent over all five environments. One of them corresponds to the Pm5 locus derived from Forno on chromosome 7B. The other QTL on 5A, was derived from the spelt variety Oberkulmer and did not correspond to any known Pm gene. In addition, five QTLs were consistent over three environments, and six QTLs over two environments. The QTL at the Pm5 locus showed a large effect, although virulent races for Pm5 were present in the mixture of isolates. Molecular markers linked with QTLs for adult-plant resistance offer the possibility of simultaneous marker-assisted selection for major and minor genes.

Key words Erysiphe graminis Powdery mildew resistance QTL Triticum aestivum Triticum spelta 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • M. Keller
    • 1
  • B. Keller
    • 3
  • G. Schachermayr
    • 1
  • M. Winzeler
    • 1
  • J. E. Schmid
    • 2
  • P. Stamp
    • 2
  • M. M. Messmer
    • 1
  1. 1.Swiss Federal Research Station for Agroecology and Agriculture (FAL-Reckenholz), Reckenholzstrasse 191, CH-8046 Zurich, Switzerland Tel.: 41-1-3777 445 Fax: 41-1-3777 201 E-mail: monika.messmer@fal.admin.chCH
  2. 2.Institute of Plant Sciences, Swiss Federal Institute of Technology (ETH), LFW, ETH-Zentrum, Universitätsrasse 2, CH-8092 Zurich, SwitzerlandCH
  3. 3.Institute of Plant Biology, University of Zurich, Zollikerstrasse 107, CH-8008 Zurich, SwitzerlandCH

Personalised recommendations