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Research Journal of Botany
Year: 2007  |  Volume: 2  |  Issue: 4  |  Page No.: 165 - 175

Granular Mycoherbicides Formulation of Fusarium oxysporum for Orobanche Biocontrol Mitigate Oxidative Stress and Growth Reduction in Host Species

M.M. Nemat Alla, Y.M. Shabana, M.S. Serag, N.M. Hassan and M.M. El-Hawary    

Abstract: An attempt was performed to achieve four granular formulations from two isolates of Fusarium oxysporum (Foxy I and Foxy II) for biocontrol of Orobanche ramosa and Orobanche crenata in tomato and faba bean; two formulations from microconidia (PM I and PM II) and two from chlamydospores (PC I and PC II). Doses of all formulations (0.5, 0.75, 1.0 and 1.25 g kg-1 soil) differentially reduced number of emerged shoots, shoot height and shoot dry weight of both Orobanche species with a remarkable increase in disease incidence on the parasitic plant, the highest dose giving the most severe symptoms. On the other hand, Orobanche-infected tomato and faba bean plants showed significant reductions in shoot height and root length as well as in shoot and root dry weights concomitant with significant increases in H2O2 content and superoxide dismutase (SOD) activity and significant decreases in ascorbic acid (AsA) content and activities of catalase (CAT), guaiacol peroxidase (GPX) and glutathione-S-transferase (GST). However, application of the highest dose of Pesta fungi overcame, to a great extent, the changes in host growthand oxidative stress parameters so that levels were similar to those of normally grown plants, the preparation PC II had the most pronounced effect. These findings showed that considerable control of the two species of Orobanche could be obtained by the formulations of the biocontrol agents, particularly at the highest dose (1.25 g kg-1 soil).

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