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Mitogen-activated protein kinase (MAPK)- mediated signaling pathways have been known to have important functions in eukaryotic organisms. The mechanisms by which the filamentous fungus Alternaria alternata senses and responds to environmental signals have begun to be elucidated. Available data indicate that A. alternata utilizes the Fus3, Hog1 and Slt2 MAPK-mediated signaling pathways, either separately or in a cooperative manner, for conidia formation, resistance to oxidative and osmotic stress, and pathogenesis to citrus. This review provides an overview of our current knowledge of MAPK signaling pathways, in conjunction with the two-component histidine kinase and the Skn7 response regulator, in the tangerine pathotype of A. alternata.
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