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2012 | 34 | 2 |
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Pseudosomonas chlororaphis: a salt-tolerant bacterial inoculant for plant growth stimulation under saline soil conditions

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Saline soils constitute a serious production problem for vegetable crops as they are known to suppress plant growth. One of the possible measures to improve crop health in such conditions is to use salt-tolerant bacterial inoculants which can control diseases and promote plant growth. In the present work the ability of Pseudomonas chlororaphis isolate TSAU13 to promote cucumber and tomato plant growth and to improve fruit yield by protecting these plants against soil-borne pathogens in salinated soil were investigated. The bacterial strain stimulated shoot growth (up to 32%), dry matter (up to 43%), and the fruit yield of tomato and cucumber (up to 16%) compared to the uninoculated control plants under saline conditions. The strain was able to survive on the root of 2-month-old plants. 29% of the cucumber and 27% of the tomato plants which had grown in soil to which no Fusarium solani spores had been added were diseased, whereas in the presence of the pathogenic fungus 58% of the cucumber and 52% tomato plants had disease symptoms. P. chlororaphis TSAU13 showed statistically significant disease reduction in comparison to the Fusarium-uninfected and infected control plants. Those results showed that P. chlororaphis TSAU13 has a great biotechnological potential in improvement of vegetable production in commercial greenhouses under saline conditions.
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