International Journal of Virology and Parasitology, Vol. 13 (1), pp. 001-009, January, 2024. © International Scholars Journals
Full Length Research Paper
Exploring the interactions between bacterial biocontrol agents and Xanthomonas axonopodis pv. phaseoli strains: Implications for bean common blight management
Bianca Obes Corrêa1, Vanessa Nogueira Soares2, Mauricio Sangiogo2, José Rogério de Oliveira3 and Andréa Bittencourt Moura2*
1Master in Agroindustrial Production and Management, Anhanguera – Uniderp University, Zip Code 79037-280 Campo Grande, Brazil.
2Phytosanitary Department, Agronomy Faculty, Federal University of Pelotas, P. O. Box 354, 96010-970 Pelotas, Brazil.
3Phytopathology Department, Federal University of Viçosa, 36571-000 Viçosa, Brazil.
Accepted 07 October, 2023
Abstract
The bacterial biocontrol agents (BCAs) treatments were used for seed microbiolization; the bacterial biocontrol agents (BCAs) used selected from previous study on the control of Xanthomonas-axonopodis pv. phaseoli Xap) includes: Bacillus (DFs093, DFs348 and DFs769), Pseudomonas (DFs513, DFs831 and DFs842), Rhodococcus (DFs843 and DFs912), and the combinations C01 (DFs093+DFs769+DFs831), C02 (DFs093+DFs769+DFs842) and C03 (DFs093+DFs769+DFs348). Sixteen (16) Xap strains were collected from several Brazilian regions, and were inoculated in cotyledonary leaves. The symptom development was followed for 10 days. The treatments were compared by the area under the disease progress curve for disease incidence, severity, and index. In general, majority of the BCAs reduced, to some degree, the disease caused by different Xap strains. The combination C01, and the isolate DFs831 resulted in highest mean disease control. The data from this study suggest a relationship between the region of origin of Xap strain and the efficacy of BCA to control the disease caused by it. The use of combinations of these organisms increased the efficacy of the biocontrol of several strains of the same pathogen. A strain-BCA interaction was shown by data collected from this study, which evidence the importance of selecting a BCA or a combination of BCAs with a wider spectrum of action.
Key words: Biological control, co-inoculation, Bacillus, Pseudomonas, Rhodococcus, bean common blight.