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Seed treatment with a 2,4-diacetylphloroglucinol (DAPG)-producing Pseudomonas strain ameliorated abiotic stress disorder in corn caused by growth in a low-pH soil. In two consecutive growing seasons, Wood1R-treated seed gave rise to plants that grew taller (P&lt;or=0.05), had fewer foliar lesions (P&lt;or=0.10), and provided greater yields (P&lt;or=0.1) than the negative controls when grown in soil with a pH&lt;5.0. Under controlled conditions, seed treatment with Wood1R also reduced foliar lesion severity (P&lt;or=0.05 in two of three experiments) but failed to increase shoot or root growth in young seedlings grown in acidic soil. Significant (P&lt;or=0.05) patterns of altered mineral nutrient uptake (i.e., generally increasing P and Mg while reducing Al) were observed to occur as a result of Wood1R seed treatment under both sets of growing conditions. In contrast, suppression of seedling damping-off disease was not indicated in this low-pH soil, because no difference in crop stand was observed for any experiment. Additionally, Wood1R-mediated growth inhibition of seedling pathogens was reduced in vitro at pH&lt;5.0, indicating that secretion of antifungal metabolites may not occur in low-pH soils. This is the first report of an abiotic stress amelioration of acid soil stress-related symptoms by a DAPG-producing pseudomonad.

Seed Treatment with 2,4-Diacetylphloroglucinol-Producing Pseudomonads Improves Crop Health in Low-pH Soils by Altering Patterns of Nutrient Uptake