Antagonistic effect of soil bacteria against fusarium wilt of pepper in vitro
2011
Đorđević, M., Institute for Vegetable Crops, Smederevska Palanka (Serbia) | Ugrinović, M., Institute for Vegetable Crops, Smederevska Palanka (Serbia) | Sević, M., Institute for Vegetable Crops, Smederevska Palanka (Serbia) | Đorđević, R., Institute for Vegetable Crops, Smederevska Palanka (Serbia) | Mijatović, M., Institute for Vegetable Crops, Smederevska Palanka (Serbia)
The aim of this work was to isolate bacteria from the rhizosphere of tomato and pepper plants infected with Fusarium oxysporum and from soils where the fusarium wilt pathogen was noticed earlier, as well as to explore the possibility for control of Fusarium oxysporum, the causal agent of pepper wilt, using their antagonistic traits, in vitro. A total of 25 visually different bacteria were isolated from soil and 1 was isolated from melon leaf and included in the research as it showed a strong antagonistic effect against the isolated fungus. Eleven out of 26 isolates had a more or less antagonistic effect on this pathogen. Isolate Ab23 showed the strongest inhibition rate with PIRG value (percentage of inhibition of radial growth) of 70.98%. Isolates Ab7 (61.24%), Ab17 (57.73%) and Ab1 (56.56%) also produced a satisfactory effect. Interestingly, isolate Ab9 even though not being from the soil showed a very high value of inhibition of radial growth of pathogen mycelia (59.74%). Inhibition rate of isolates Ab18, Ab21, Ab10, Ab22, Ab5, and Ab20 was 37.67% - 28.99%. Given the above, there are bacteria in the rhizosphere of diseased plants of tomato and pepper or in the soil where fusarium wilt of tomato and pepper has been previously reported that have an antagonistic effect against the causal agent of pepper wilt, Fusarium oxyporum, and that can be successfully used in control of this pathogen, in vitro. Even the isolate of non-soilborne bacteria can show antagonism against soil pathogen, in vitro.
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