Response of some Apple Genotypes from Local Apple Collection of Iran to Erwinia amylovora

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Abstract

Relative resistance of 58 local apple genotypes to Erwinia amylovora (Burrill.) Winslow et al., the causal agent of fire blight was studied. Bacterial strains were collected from pome fruit orchards of Orumieh, Karaj, Mashhad, Shahrud, Qazvin and Sanandaj cities and identified using phenotypical and molecular tests. A mixture of seven strains were used as inoculum. Evaluation was performed using shoot tip inoculation method nuder glasshouse condition on one-year old seedlings grafted onto M26 rootstocks and blight severity was scored six weeks after inoculation. Based on the results, 5% of genotypes were rated as resistant, 17% moderately resistant, 18% moderately susceptible, 28% susceptible and 32% highly susceptible. Based on these results, it is concluded that local apple germplasm is relatively susceptible to fire blight.  

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Seed and Plant Journal
Volume 27, Issue 1
May 2011
Pages 23-36

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