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Time- and dose-dependent extracellular alkalinization of potato suspension cells in the presence of potato pathogens. The pH was recorded in 5, 25, 45, and 60 min after addition of spores of Spongospora subterranea (A), Phytophthora infestans (B), Verticillium dahliae (C), and Colletotrichum coccodes (D). Histograms show mean ± SE of three replicates in three independent experiments.
