Response of some Quince (Cydonia oblonga Mill.) Genotypes from Guilan and Khorasan Provinces to Fire Blight Disease

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Abstract

This research was conducted to evaluate the susceptibility of some recently selected quince genotypes to the fire blight disease on hawthorn rootstock. Seven quince genotypes from Guilan and nine genotypes from Khorasan Razavi provinces together with the quince cultivar Isfahan as control were evaluated using four bacterial isolates encoded as 2, 36, K1 and Z1. The bacterial isolates initially were selected by biochemical, physiological, and virulence tests, as well as nested fragment amplification on pEA29 plasmid by Aj external and PEANT internal primers. Generally, all selected quince genotypes showed more disease resistance compared to the "Isfahan" cultivar. Genotypes M4 with 47.3% and ASM1 with 13.1% final disease progress showed the highest and lowest symptoms, respectively. Based on the results, 3 quince genotypes were classified as moderately susceptible, 11 genotypes were moderately resistant and 2 genotypes were resistant and none of the genotypes were susceptible. According to the results of necrosis progress rate, the beginning period of disease establishment did not have correlation with final resistance of genotypes

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Seed and Plant Journal
Volume 28, Issue 1
April 2012
Pages 67-84

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