ISHS Acta Horticulturae 596: VIII International Symposium on Pear
REACTIVITY OF EUROPEAN PEAR (PYRUS COMMUNIS) PROGENIES TO FIRE BLIGHT (ERWINIA AMYLOVORA) |
| Authors: | L. Dondini, S. Tartarini, S. Sansavini, S. Malaguti, C. Bazzi |
| Keywords: | polygenic resistance, breeding, segregation, susceptibility index |
| Abstract:
Two genetically different polygenic sources of fire blight resistance in European pear (‘Harrow Sweet’ and US 309) were crossed with the susceptible cultivars Passe Crassane and Abbé Fétel, respectively, to obtain two segregating progenies. These progenies were screened for fire blight resistance in greenhouse by experimental inoculation with a local strain of Erwinia amylovora. All four parental lines and ‘Old Home’, a highly resistant control, were also tested. ‘Passe Crassane’ and ‘Abbé Fétel’ confirmed their high susceptibility to the disease while ‘Harrow Sweet’ and US 309 their good, albeit not complete, degree of resistance; ‘Old Home’ showed no disease symptoms. The continuous distribution of resistance/susceptibility was observed in both progenies, thereby confirming the polygenic nature of these two sources of resistance. | |
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