Selection of Streptomyces spp. Isolates with Antifungal Activity against Rice Blast Fungus, Pyricularia grisea

Abstract

    Biological control of plant diseases including fungal pathogens has been considered as viable alternative to chemical control. A total of 395 isolates of Streptomyces were evaluated as antagonist agents to Pyricularia grisea. Of these, 50 isolates of Streptomyces showed high antagonistic ability to four races of P. grisea. Six Streptomyces isolates were identified as Streptomyces cavourensis S27, Streptomyces xiamenensis S257, Streptomyces viriabilis S28, Streptomyces iakyrus S233, Streptomyces scopuliridis S136, and Streptomyces fulvissimus S30, that were highly antagonistic to P. grisea. These isolates grew well on medium at high temperature (30^oC) and fairly high salt concentration and produced high level of IAA.