tailieunhanh - Study on the different modes of action of potential Trichoderma spp. from banana rhizosphere against Fusarium oxysporum f.sp. cubense

An attempt was made to study the different modes of action of the promising Trichoderma spp. from banana rhizosphere collected from different regions of Assam, Mizoram, Meghalaya and Nagaland. The results from the present investigation revealed that all the potential Trichoderma spp. produced IAA, NH3, siderophore and HCN, though at different levels however, the promising Trichoderma spp. were not able to solubilize phosphate on solid medium containing insoluble inorganic phosphorus source. Considering the possibility of an improved potentiality of combined application, a study was also undertaken to check the effect of combined application of the Trichoderma spp. against Fusarium oxysporum . cubense (Foc), the causal organism of Fusarium wilt of banana. The per cent inhibition over control was calculated after 48, 72 and 96 hours after inoculation. The result revealed that the efficacy of all the treatments differed significantly with that of control at all the intervals. The per cent inhibition of radial growth of Foc in vitro was observed highest by the combination of the three Trichoderma spp. viz. T. reesei (RMF-25), T. reesei (RMF-13) and T. harzianum (RMF- 28) with per cent followed by the combination of T. reesei (RMF-25), and T. harzianum (RMF-28) with per cent and combination of T. reesei (RMF-13) and T. harzianum (RMF-28) with per cent inhibition of the test pathogen after 96 hours of incubation. | Study on the different modes of action of potential Trichoderma spp. from banana rhizosphere against Fusarium oxysporum . cubense