Abstract
Laboratory experiments were conducted to study the efficacy of bacterial isolates and strains on Phelipanche ramosa haustorium initiation at the Bio-pesticides and Bio-fertilizers Department, Environment, Natural Resources and Desertification Research Institute (ENDRI), NCR, Khartoum, Sudan. Fifteen soil borne bacteria isolates (9 organic nitrogen users and 6 mineral nitrogen users) and 3 bacterial strains (Bacillus circulans, B. megatherium var. phosphaticum and Azospirillum brasiliense) were tested. All tested bacterial isolates and strains caused a significant (P≤ 0.5) reduction in haustorium initiation as compared to control in response to DMBQ (2, 6 dimethoxybenzequinone). Organic nitrogen using bacterial isolates ISO5M and ISO22M reduced haustoria by 32 to 54% as compared to the corresponding control. While the mineral nitrogen using bacterial isolate ISO1S and Bacillus circulans strain reduced haustorium by 37 to 45% compared to medium control. The most efficient isolates were identified as Serratia odorifera (ISO22M) with probability 95% and Rhizobium radiobacter (ISO5M) with probability 99%.
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