EFFICACY OF THREE OF THE MOST EFFECTIVE FACULTATIVE OLIGOTROPHIC PUTATIVEN2-FIXING BACTERIAL STRAINS IN CONTROLLING DAMPING-OFF DISEASE OF TWO CAUSABLE PATHOGENIC FUNGI IN TOMATO. | ||||
Fayoum Journal of Agricultural Research and Development | ||||
Article 4, Volume 30, Issue 2, July 2016, Page 53-68 PDF (436.66 K) | ||||
Document Type: Research articles. | ||||
DOI: 10.21608/fjard.2016.191747 | ||||
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Authors | ||||
S.A Abd elaziz; K.A. Elbanna; R.M El-Shahawy | ||||
Agricultural of Microbiology Department, Faculty of Agriculture, Fayoum University. | ||||
Abstract | ||||
Complete identification was made for three strains of the facultative putative N2-fixing bacteria using the 16s DNA sequencing studies and by detailed conventional API kit and other possible genetic determination. The efficacy of Bacillus subtilis subsp. spizizenii strain NRRL B-23049T (S4), Naxobacter varians strain CCUG 35299 (S5) and Bacillus megatherium strain IAM 13418. (S6), their potency against two pathogenic fungi causing damping-off and their effect on N-content of tomato plant. Inoculated tomato plants with any of the three bacterial strains, each alone or together, in presence of 1/3 N-recommended dose, significantly increased N- content and yield production. The fungi infested plants (Py. altimum and R. solani) showed pronounced decreases in yield and N-content. Incorporation of the three putative N2- fixers antagonizer strains partially alleviated the adverse effect of any of the infested fungi. The presence of the three antagonizer strains together increased the defense mechanism principles of plants like PO, PPO and phenol content. In case of the presence of the three antagonizers and 1/3 N-dose, survived plants reached 100% while other treatments showed fluctuated estimates between 20 and 96.7% due to the treatment and the plant used. | ||||
Keywords | ||||
Oligotrophs; Oligonitrotrophs; Oligocarbotrophs; Putative N2-Fixers; Biocontrol Agents | ||||
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