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Detection of QTLs in a Mediterranean climate associated with fire blight necrosis length in Pyrus communis using a high‐resolution genetic linkage map
Author(s) -
Gabay Gilad,
Dahan Yardena,
Cohen Oded,
Barshan Idan,
Itzhaki Yacov,
Flaishman Moshe A.
Publication year - 2021
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/pbr.12903
Subject(s) - fire blight , biology , quantitative trait locus , cultivar , pear , population , erwinia , blight , horticulture , botany , agronomy , genetics , gene , demography , sociology
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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