Plant Breeding (2021) 140, 703-710

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Gilad Gabay, Yardena Dahan, Oded Cohen, Idan Barshan, Yacov Itzhaki and Moshe A. Flaishman (2021)
Detection of QTLs in a Mediterranean climate associated with fire blight necrosis length in Pyrus communis using a high-resolution genetic linkage map
Plant Breeding 140 (4), 703-710
Abstract: Fire blight caused by the bacterium Erwinia amylovora, is the most critical disease of European pear. Breeding of resistant cultivars is a possible solution for a growing demand for healthier alternative practices for disease control. In this study, we present a pear fire blight genetic study using a large F1 population. Quantitative trait loci (QTLs) were detected using a high-resolution genetic map, allowing detection of QTLs with small intervals. A total of 162 offspring crossbred between 'Harrow Sweet' (HS, low susceptibility cultivar) and 'Spadona' (SPD, high susceptibility cultivar) were studied. We detected a significant genotype effect (p < .0001), which explained 46.4% of the variance of the necrosis length. A major QTL of the main genotype effect (AVG) was detected at 8.8 cM in linkage group (LG) 2 (LOD = 7.7). Additional QTLs were detected in LGs 7, 13 and 15. These markers can greatly contribute to pear breeding programs in a Mediterranean climate and can shed light on potential candidate genes that control fire blight resistance.
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Link to article at publishers website

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Erwinia amylovora Pear (Pyrus) Israel