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- Title
IMPACT OF SOME GENETICALLY IMPROVED RHIZOBACTERIA IN CONTROLLING MELOIDOGYNE INCOGNITA AND TWO WEEDS INFECTING SOLANUM LYCOPERSICUM SEEDLINGS UNDER GREENHOUSE CONDITIONS.
- Authors
Ameen, Hoda Hussein; Soliman, Gaziea Mohamed; El-Wakeel, Mona Adel; Elkelany, Usama Samy; Mohamed, Shereen Abdel Hameed
- Abstract
Biological control is considered as an alternative strategy to chemical tool for controlling either nematodes or weeds. So, two pot experiments were carried out to evaluate the role of two native isolated bacteria Bacillus cereus, Pseudomonas aeruginosa and their three fusant strains namely (fusant7, fusant 20 and fusant 35) as biocontrol agents against root knot nematode Meloidogyne incognita and two weeds Portulaca oleracea and Echinochloa crus-galli infecting Solanum lycopersicum. Revealed results on nematode population, weeds and S. lycopersicum seedlings growth were recorded seven weeks after nematode inoculation. The results exhibited that, all bacterial strains suspension at the rates of (1.25x107 and 2.50x107cuf/ml) significantly suppressed M. incognita parameters, decreased fresh and dry weights of weeds and improved S. lycopersicum growth. In general, undiluted concentration of all bacterial suspensions was more effective than diluted one. Additionally, fusants were more effective than their parents in reducing nematode population and controlling both weeds. Combination of two strains was more effective than the individual application in controlling nematode and P. oleracea weed. But, it was less effective in controlling E. crus-galli weed. P. aeruginosa was more effective than B. cereus in suppress nematode and weeds parameters. The fusant 7 was more effective than all other treatments in suppressing M. incognita J2 in soil, galls and eggmasses/root system by 91.30%, 92.50% and 90.91% reduction, respectively as compared to control. Also, fusant 7 was the highly effective strain in decreasing the fresh and dry-weights of E. crus-galli, by 75.87% and 75.55%, respectively and of P. oleracea, by 84.68% and 86.17% consecutively as compared to unweeded control treatment. This in turn reflected on S. lycopersicum seedlings by improving growth parameters. In conclusion, the genetically improved bacterial strains could be used as biological alternative safe method to chemical pesticides for suppressing root knot nematode reproduction and weed seedlings growth.
- Subjects
RHIZOBACTERIA; SOUTHERN root-knot nematode; WEEDS; SEEDLINGS; PSEUDOMONAS aeruginosa
- Publication
Plant Archives (09725210), 2020, Vol 20, Issue 2, p2153
- ISSN
0972-5210
- Publication type
Article