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Effects of bacterial isolates and strains on Phelipanche ramosa (L.) Pomel haustorium initiation

M.M. Hassan, A.G. Osman, A.M.E. Rugheim, A.I. Ali, M.E. Abdelgani A.G.T. Babiker

Environment, Natural Resources and Desertification Research Institute, National Centre for Research, Sudan

Faculty of Agriculture, Omdurman Islamic University, Sudan

M.Sc. Student, Sudan Academy of Sciences (SAS), Sudan

College of Agricultural Studies, Sudan University of Science and Technology, Sudan

Key words: Bacteria, broomrape, DMBQ, haustoria, suppression.


orobanche_alba_thyme_broomrape_flowering_plant_30-05-06Laboratory 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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