Screening of antagonistic activity in different Streptomyces species against Paecilomyces variotii and verification of some of the physiological properties of the antagonists
Journal Title: International Journal of Farming and Allied Sciences - Year 2017, Vol 6, Issue 6
Abstract
Paecilomyces variotii is a filamentous fungus which inhabits in soil, water, and functioning as biodegrading agent. In this study, biological control of Paecilomyces variotii was evaluated by two Streptomyces isolates. Eighty isolates were screened among Kerman soil samples. Among Streptomycese isolates with antifungal activity against Paecilomyces variotii, LA5 and LA27 isolates showed the most antagonistic effect on considered fungus in the study. After antibiogram test against Paecilomyces variotii, antagonistic activity of isolates was evaluated by measuring diameter of inhibition zone. Two isolates were identified as Stereptomyces according to observation of scanning electron microscopy (SEM) and biological characters and about LA27 isolate, genotype properties was provided for identification of this isolate. Phylogenetic studies were conducted based on 16s rRNA sequence. Active strains were evaluated for Minimal Inhibitory Concentration (MIC). Both isolates could produce extracellular enzymes and antifungal activity of Streptomyces on pathogen mycelia was fungicidal type. Moreover, each one of obtained antagonists can examine in future studies for identification and chemical structure of antifungal material. If they can obtain necessary standards of environmental indices, they can be considered as biological control in campaign management with the pathogen.
Authors and Affiliations
Laleh Ansari, Rezvan Vazirzadeh Sirchi, Gholam Hosein Sahidi Bonjar and Seyed Amin Ayatollahi Moosavi
Keywords
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