Volume 30 Number 1 Article 5 Pages: 9-9
Year 1976 Month 1
Title: Inheritance of Fire Blight Susceptibility in Pear (Pyrus communis L.)
Author: J.M. Thompson
Citation
Abstract:
We found the wide-spread distribution in high-quality dessert pears of a gene, Se, that causes sensitivity (usually mortal susceptibility) to fire blight, Se behaves as a dominant in the back cross tests we have made, but may not be fully dominant.
We have tested no parents that proved to have an SeSe genotype, but postulate this homozygous genotype in such sensitive cultivars as 'Aurora', 'Forelle', and 'De Voe'.
Among sensitive cultivars used as parents in our crosses, 'Beurre d'Anjou', 'Clyde', 'Doyenne du Comice', 'Max-Red Bartlett', 'NJ 490871089', 'NJ 5001480917', NJ 5008710504', 'Pioneer', and 'Seckel' are sensitive to fire blight phenotypically, heterozygous at the Se mocus, and capable of transmitting some resistance to their non-sensitive offspring.
Also from our tests, the cultivars 'Bartlett', 'Beurre Bosc', 'Conference', Gorham', 'Marie Louise', 'NJ 501971-234', and 'Turkey #7' are also sensitive to fire blight and heterozygous at the Se locus, but capable of transmitting only limited resistance to their non-sensitive offspring.
The cultivars 'Charles Escaig', 'Ewart', 'Parberton', Pulteney', 'US 446', 'US 447', and 'US 938' are susceptible but not sensitive.
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