Effect of Paraquat-resistant Bacteria on the lifespan of the tomato plant and some growth characters of maize plant

عباسی, زهرا and سرچشمه پور, مهدی and خالقی, موج Effect of Paraquat-resistant Bacteria on the lifespan of the tomato plant and some growth characters of maize plant. In: 2nd International and 6th National Iranian Congress on Organic vs. Conventional Agriculture, August 2019, Ardabil, Iran.

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Abstract

Intensive application of pesticides pose severe threats to human health or the environment, and this awareness has led to environmentalists shifted attention to the effects of the pesticides on non-target organisms. This study was aimed at isolation and screening of soil bacteria that are resistant to the high concentration of paraquat, at last experiment, the effect of paraquat-resistant Bacteria on the lifespan of the tomato plants and some growth characters of maize plants was investigated in the substrate that treated by pesticides. To obtain paraquat-resistant Bacteria, soil samples were collected from farms of Jiroft city with a history of pesticides use. The samples were transferred to the laboratory. After one month incubation of soil with 1% concentration of paraquat, paraquat-resistant bacteria were isolated and purified, after that, the paraquat-resistant strain of bacteria was selected for greenhouse experiment. Tomato plants were planted in substrate contained 0, 500 and 1000 ppm of paraquat and maize plants were planted in substrate contained 0 and 500 ppm of paraquat. Half the pots were inoculated with bacteria and another half represented controls with no bacteria inoculation. An analysis of variance showed the interaction between pesticide and bacterial inoculation on the lifespan of tomato plants was significant in 1%level. Furthermore, the interaction between pesticide and bacterial inoculation on height, shoot fresh weight and shoot dry weight was significant at 1% level. Therefore, Paraquat-resistant strain of bacteria may have been effective in decomposing the pesticide and as a sequence have a positive effect on the lifespan and vegetative properties of the plants.

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