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United States Department of Agriculture

Agricultural Research Service


Location: Appalachian Fruit Research Laboratory: Innovative Fruit Production, Improvement and Protection

Title: Identification and mapping of genes differentially expressed during interaction of resistant and susceptible apple cultivars (Malus x domestica) with Erwinia amylovora

item Malnoy, Mickael - ASMA RES CENTRE, ITALY
item Norelli, John (jay)
item Bassett, Carole
item Farrell, JR., Robert - PENN STATE UNIVERSITY
item Baldo, Angela
item Borejsza-Wysocka, Ewa - CORNELL UNIVERSITY
item Carlisle, Charmaine - HORTRESEARCH, NEW ZEALAND
item Gardiner, Susan - HORTRESEARCH, NEW ZEALAND
item Celton, Jean-Marc - HORTRESEARCH, NEW ZEALAND
item Aldwinckle, Herb - CORNELL UNIVERSITY

Submitted to: Plant and Animal Genome Conference
Publication Type: Abstract Only
Publication Acceptance Date: November 1, 2007
Publication Date: January 12, 2008
Repository URL:
Citation: Malnoy, M., Norelli, J.L., Bassett, C.L., Farrell, Jr., R.E., Baldo, A.M., Borejsza-Wysocka, E., Carlisle, C.M., Gardiner, S.E., Celton, J., Aldwinckle, H.S. 2008. Identification and mapping of genes differentially expressed during interaction of resistant and susceptible apple cultivars (Malus x domestica) with Erwinia amylovora. Plant and Animal Genome Conference. p. 454.

Technical Abstract: The necrogenic enterobacterium, Erwinia amylovora (Ea) is the causal agent of the fire blight (FB) disease of many Rosaceae species, including apple and pear. During the infection process, the bacteria induce an oxidative stress response with kinetics similar to those induced in an incompatible bacteria-plant interaction. In order to understand the mechanisms that distinguish resistant and susceptible responses in FB resistant and susceptible apple genotypes after inoculation with Ea, differentially expressed genes were identified by cDNA-AFLP analysis. cDNA was isolated from M.26 (susceptible) and Geneva 41 (G.41, resistant) apple tissues collected 2 and 48h after challenge with a virulent Ea strain or mock (buffer) inoculated. In the AFLP experiments, M.26 and G.41 showed different patterns of expression, including genes specifically induced, not induced, or repressed by Ea. In total, 198 EST's differentially expressed between M.26 and G.41 were identified using 42 pairs of AFLP primers. cDNA-AFLP analysis of global EST expression in a resistant and a susceptible apple genotype identified several major classes of genes. Sequencing data for the ESTs showed that host genes linked to resistance, including proteins involved in perception, signaling, defense and apoptosis, were modulated by Ea. Thirty genes were identified by a bioinformatics study to be specifically involved in the interaction Malus / E. amylovora and not in any other reported biotic or abiotic reaction. Mapping of these ESTs is in progress. This project is supported by a National Research Initiative Competitive Grant 2005-35300-15462 from the USDA Cooperative State Research, Education, and Extension Service.

Last Modified: 10/1/2014
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