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Taler, D., Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 52900, Israel
Galperin, M., Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 52900, Israel
Benjamin, I., Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 52900, Israel
Cohen, Y., Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 52900, Israel
Kenigsbuch, D., Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 52900, Israel, Department of Postharvest Science, Volcani Center, P.O. Box 6, Beit Dagan, Israel
Downy mildew caused by the oomycete pathogen Pseudoperonospora cubensis is a devastating foliar disease of cucurbits worldwide. We previously demonstrated that the wild melon line PI 124111F (PI) is highly resistant to all pathotypes of P. cubensis. That resistance was controlled genetically by two partially dominant, complementary loci. Here, we show that unlike other plant disease resistance genes, which confer an ability to resist infection by pathogens expressing corresponding avirulence genes, the resistance of PI to P. cubensis is controlled by enhanced expression of the enzymatic resistance (eR) genes At1 and At2. These constitutively expressed genes encode the photorespiratory peroxisomal enzyme proteins glyoxylate aminotransferases. The low expression of At1 and At2 in susceptible melon lines is regulated mainly at the transcriptional level. This regulation is independent of infection with the pathogen. Transgenic melon plants overexpressing either of these eR genes displayed enhanced activity of glyoxylate aminotransferases and remarkable resistance against P. cubensis. The cloned eR genes provide a new resource for developing downy mildew-resistant melon varieties.
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Plant eR Genes That Encode Photorespiratory Enzymes Confer Resistance against Disease
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Taler, D., Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 52900, Israel
Galperin, M., Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 52900, Israel
Benjamin, I., Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 52900, Israel
Cohen, Y., Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 52900, Israel
Kenigsbuch, D., Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 52900, Israel, Department of Postharvest Science, Volcani Center, P.O. Box 6, Beit Dagan, Israel
Plant eR Genes That Encode Photorespiratory Enzymes Confer Resistance against Disease
Downy mildew caused by the oomycete pathogen Pseudoperonospora cubensis is a devastating foliar disease of cucurbits worldwide. We previously demonstrated that the wild melon line PI 124111F (PI) is highly resistant to all pathotypes of P. cubensis. That resistance was controlled genetically by two partially dominant, complementary loci. Here, we show that unlike other plant disease resistance genes, which confer an ability to resist infection by pathogens expressing corresponding avirulence genes, the resistance of PI to P. cubensis is controlled by enhanced expression of the enzymatic resistance (eR) genes At1 and At2. These constitutively expressed genes encode the photorespiratory peroxisomal enzyme proteins glyoxylate aminotransferases. The low expression of At1 and At2 in susceptible melon lines is regulated mainly at the transcriptional level. This regulation is independent of infection with the pathogen. Transgenic melon plants overexpressing either of these eR genes displayed enhanced activity of glyoxylate aminotransferases and remarkable resistance against P. cubensis. The cloned eR genes provide a new resource for developing downy mildew-resistant melon varieties.
Scientific Publication
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