Abstract
The effect of Pseudomonas fluorescens on soft-rot formation in melon seedlings infected with a virulent strain of E.carotovora subsp. carotovora was evaluated. Pseudomonas fluorescens strain 346683 exhibited in vitro antibiosis towards E.carotovora subsp. carotovora strain 119a.Pretreatment of the cotyledons with viable cells of P.fluorescens has been shown to reduce the infection up to 50% and was able to reduce the deleterious effect of E.carotovora subsp. carotovora on fresh and dry weight of melon seedlings.Also, pretreatment with P.fluorescens caused significant increases in total carbohydrates and total nitrogen.Levels of protein had increased in protected seedlings. These results suggest beneficial effects of pretreatment with P.fluorescens in addition to the control of soft rot disease.
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