科研之友
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摘要
Macrophomina phaseolina (Tassi) Goid., the cause of charcoal rot disease, is the major biotic factor that limits cowpea [Vigna unguiculata (L.) Walp.] productivity worldwide. The present study was designed to investigate the antifungal potential of an allelopathic grass Sorghum halepense Pers. for the management of M. phaseolina isolated from charcoal rot infected cowpea plants. In laboratory bioassays, different concentrations (0, 0.5, 1.0,., 3.0 g/ml) of methanolic extracts of shoot, root and inflorescence of the test allelopathic grass were evaluated for their in vitro antifungal activity against M. phaseolina. Extracts of all the three parts of the grass exhibited variable antifungal activity. Shoot extract was found the most effective where all the extract concentrations significantly reduced the fungal biomass by 14 to 61% over control. Similarly, all concentrations of the root extract except 0.5% significantly suppressed the fungal biomass. Inflorescence extract exhibited the least antifungal activity where only 2% and higher concentrations showed the significant effect. There was 9 to 48% and 4 to 39% reduction in fungal biomass due to various concentrations of methanolic root and inflorescence extracts, respectively.
- 出版日期2012-7-26
