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Journal of Plant Pathology

Droby, S., Institute of Postharvest and Food Science, Agricultural Research Organization (ARO), Volcani Center, Bet Dagan, Israel
Hershkovitz, V., Institute of Postharvest and Food Science, Agricultural Research Organization (ARO), Volcani Center, Bet Dagan, Israel
Sela, N., Institute of Postharvest and Food Science, Agricultural Research Organization (ARO), Volcani Center, Bet Dagan, Israel
Raphael, G., Institute of Postharvest and Food Science, Agricultural Research Organization (ARO), Volcani Center, Bet Dagan, Israel
Kessler, C., Institute of Postharvest and Food Science, Agricultural Research Organization (ARO), Volcani Center, Bet Dagan, Israel
Feygenberg, O., Institute of Postharvest and Food Science, Agricultural Research Organization (ARO), Volcani Center, Bet Dagan, Israel
Wisniewski, M., United States Department, Agriculture (USDA-ARS) WV, United States



 

Although the biocontrol activity of antagonistic yeasts has been demonstrated on a variety of commodities, the mode of action of these microbial biocontrol agents has not been fully elucidated. Antagonistic yeasts of postharvest pathogens have been reported to induce several biochemical defense responses in host tissues of surface-wounded fruit. The interaction of yeast cells with fruit tissue resulted in major responses of the fruit that included enhanced production of ROS, phytoalexins, fungal cell wall degrading enzymes and the formation of structural barriers such as deposition of papillae and lignin in host cell walls. We have also shown that interaction of yeast cells with fruit tissue alters the volatile profile by down-regulation or up-regulation of certain compounds. To gain a better understanding of the molecular changes taking place in fruit tissue following the application of the yeast Metschnikowia fructicola, microarray analysis was performed on grapefruit surface wounds. The data indicated that 1007 putative unigenes showed significant expression changes following wounding and yeast application compared to wounded controls. Microarray results of select genes were validated by RT-qPCR. The data indicated that yeast application induced expression of Rbo, MAPK and MAPKK, G-proteins, CHI, PAL, CHS, 4CL. In contrast, three genes POD, SOD and CAT were down- regulated in grapefruit peel tissue treated with the yeast cells. Suppression was correlated with significantly higher levels of hydrogen peroxide, superoxide anion and hydroxyl radical production in yeast-treated surface wounds. This study provides the first global picture of gene expression changes in grapefruit in response to yeast antagonists.
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Biochemical and transcriptomic analysis of host responses to yeast biocontrol agents of postharvest pathogens
1012

Droby, S., Institute of Postharvest and Food Science, Agricultural Research Organization (ARO), Volcani Center, Bet Dagan, Israel
Hershkovitz, V., Institute of Postharvest and Food Science, Agricultural Research Organization (ARO), Volcani Center, Bet Dagan, Israel
Sela, N., Institute of Postharvest and Food Science, Agricultural Research Organization (ARO), Volcani Center, Bet Dagan, Israel
Raphael, G., Institute of Postharvest and Food Science, Agricultural Research Organization (ARO), Volcani Center, Bet Dagan, Israel
Kessler, C., Institute of Postharvest and Food Science, Agricultural Research Organization (ARO), Volcani Center, Bet Dagan, Israel
Feygenberg, O., Institute of Postharvest and Food Science, Agricultural Research Organization (ARO), Volcani Center, Bet Dagan, Israel
Wisniewski, M., United States Department, Agriculture (USDA-ARS) WV, United States



 

Biochemical and transcriptomic analysis of host responses to yeast biocontrol agents of postharvest pathogens
Although the biocontrol activity of antagonistic yeasts has been demonstrated on a variety of commodities, the mode of action of these microbial biocontrol agents has not been fully elucidated. Antagonistic yeasts of postharvest pathogens have been reported to induce several biochemical defense responses in host tissues of surface-wounded fruit. The interaction of yeast cells with fruit tissue resulted in major responses of the fruit that included enhanced production of ROS, phytoalexins, fungal cell wall degrading enzymes and the formation of structural barriers such as deposition of papillae and lignin in host cell walls. We have also shown that interaction of yeast cells with fruit tissue alters the volatile profile by down-regulation or up-regulation of certain compounds. To gain a better understanding of the molecular changes taking place in fruit tissue following the application of the yeast Metschnikowia fructicola, microarray analysis was performed on grapefruit surface wounds. The data indicated that 1007 putative unigenes showed significant expression changes following wounding and yeast application compared to wounded controls. Microarray results of select genes were validated by RT-qPCR. The data indicated that yeast application induced expression of Rbo, MAPK and MAPKK, G-proteins, CHI, PAL, CHS, 4CL. In contrast, three genes POD, SOD and CAT were down- regulated in grapefruit peel tissue treated with the yeast cells. Suppression was correlated with significantly higher levels of hydrogen peroxide, superoxide anion and hydroxyl radical production in yeast-treated surface wounds. This study provides the first global picture of gene expression changes in grapefruit in response to yeast antagonists.
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