Quantitative Trait Loci Associated with Isolate Specific and Isolate Non-Specific Partial Resistance to Sclerotinia sclerotiorum in Sunflower

Authors
M. Amoozadeh 1
R. Darvishzadeh 1
R. Davar 2
B. Abdollahi Mandoulakani 1
B. Abdollahi Mandoulakani 1
P. Haddadi 3
A. Basirnia 1
1 Department of Plant Breeding and Biotechnology, Urmia University, P. O. Box 165, km 12 Nazlou Road, Urmia, Islamic Republic of Iran.
2 Institute of Biotechnology, Urmia University, Shahid Beheshti St., Urmia, Islamic Republic of Iran.
3 INRA, Institute Jean-Pierre Bourgin (IJPB), 78026, Versailles Cedex, France.
Abstract
Basal stem rot caused by Sclerotinia sclerotiorum (Lib.) de Bary is one of the most important diseases of sunflower. Quantitative trait loci (QTL) implicated in partial resistance to two isolates of S. sclerotiorum (SSU107 and SSKH41) were investigated using F9 recombinant inbred lines (RILs) from the cross between sunflower parental lines PAC2 and RHA266. Experiments were conducted in completely randomized design with 3-6 replications under controlled conditions. The reaction of genotypes to basal stem rot disease was evaluated by measuring the percentage of necrosis area three days after inoculation. Combined analysis of experiments showed significant interactions between sunflower genotypes and S. sclerotiorum isolates suggesting that partial resistance to S. sclerotiorum should be isolate-specific in sunflower. QTLs were mapped using an updated high-density SSR and SNP linkage map. The map consisted of 210 SSRs and 11 gene-derived markers placed in 17 linkage groups (LGs). The total map length was 1,653.1 cM with a mean density of 1 marker per 7.44 cM. A total of 14 QTLs were detected for partial resistance to two isolates. The phenotypic variance explained by QTLs (R2) ranged from 0.10 to 9.85. The sign of additive gene effects showed that favorable alleles for partial resistance to isolates came from both parents. Six QTLs were common between two isolates on LGs 1, 8 and 17, whereas the others were specific for each isolate. Co-localized QTLs on LG 1 were linked to the glutathione S-transferase gene (GST). The co-localized QTLs for partial resistance to basal stem rot isolates could be good candidates for marker assisted selection (MAS).

Keywords

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Journal of Agricultural Science and Technology
Volume 17, Issue 1
January and February 2015
Pages 213-226