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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730
EISSN: 1021-9730
Vol. 28, No. 2, 2020, pp. 141-149
Bioline Code: cs20011
Full paper language: English
Document type: Research Article
Document available free of charge

African Crop Science Journal, Vol. 28, No. 2, 2020, pp. 141-149

 en In vitro suppression of pathogenic fungi by Streptomyces check for this species in other resources spp.
Goredema, N.; Ndowora, T.; Shoko, R. & Ngadze, E.

Abstract

The use of living organisms or natural enemies of pathogens to control their populations is called biological disease control. It involves harnessing and introduction of exotic species of microorganism in a natural form, with the intention of controlling pathogens that may exist naturally in the same ecosystem. Prospects for biological control of Aspergillus flavus check for this species in other resources , Fusarium oxysporum check for this species in other resources and Penicillium italicum check for this species in other resources were investigated using Streptomyces spp. isolated from Chinhoyi University of Technology Farm soils in Mashonaland West, Zimbabwe. Twenty seven Streptomyces spp were obtained from the soil, and screened for antimicrobial activity and antagonism in in vitro pathogen inhibition assays, replicated thrice. Although majority of the isolates tested elicited no effect on test pathogens, 22% of the Streptomyces isolates were able to effectively suppress A. flavus, F. oxysporum and P. italicum by at least 55%. There was a significant interaction between Streptomyces isolates and pathogen (A. flavus, F. oxysporum and P. italicum) (P<0.05) on fungal radial growth at days 7, 10 and 14 after pathogen-Streptomyces incubation. Antimicrobial potential against individual and multiple test pathogens was observed, with CUT-Streptomyces 4, CUT-Streptomyces 10, CUT-Streptomyces 11, CUT-Streptomyces 20 and CUT-Streptomyces 23 showing the greatest antimicrobial activity. CUT-Streptomyces isolates have the potential to suppress A. flavus, F. oxysporum and P. italicum in vitro.

Keywords
Aspergillus flavus; Fusarium oxysporum; Penicillium italicum

 
 fr
Goredema, N.; Ndowora, T.; Shoko, R. & Ngadze, E.

Résumé

L’utilisation d’organismes vivants ou d’ennemis naturels d’agents pathogènes pour contrôler leurs populations est appelée contrôle biologique des maladies. Il s’agit d’exploiter et d’introduire des espèces exotiques de microorganismes sous une forme naturelle, dans le but de contrôler les agents pathogènes pouvant exister naturellement dans le même écosystème. Les perspectives de lutte biologique contre Aspergillus flavus check for this species in other resources , Fusarium oxysporum check for this species in other resources et Penicillium italicum check for this species in other resources ont été étudiées à l’aide de Streptomyces check for this species in other resources spp. isolées des sols agricoles de l’Université de Technologie de Chinhoyi à Mashonaland West, Zimbabwe. Vingt-sept Streptomyces spp ont été obtenus du sol et criblés pour l’activité antimicrobienne et l’antagonisme dans des tests d’inhibition des agents pathogènes in vitro, répliqués trois fois. Bien que la majorité des isolats testés ne provoquent aucun effet sur les agents pathogènes testés, 22% des isolats de Streptomyces sont capables de supprimer efficacement au moins 55% des A. flavus, F. oxysporum et P. italicum. Il y avait une interaction significative entre les isolats de Streptomyces et l’agent pathogène (A. flavus, F. oxysporum et P. italicum) (P< 0.05) lors de la croissance radiale des champignons aux 7ème, 10ème et 14ème jours après l’incubation de l’agent pathogène-Streptomyces. Un potentiel antimicrobien contre des agents pathogènes individuels et multiples a été observé. CUT-Streptomyces 4, CUT-Streptomyces 10, CUT-Streptomyces 11, CUT-Streptomyces 20 et CUT-Streptomyces 23 ont montré l’activité antimicrobienne la plus élevée. Les isolats de CUT-Streptomyces ont le potentiel de supprimer A. flavus, F. oxysporum et P. italicum in vitro.

Mots Clés
Aspergillus flavus; Fusarium oxysporum; Penicillium italicum

 
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