Antifungal activity of actinomycetes from cuban soils

Abstract

This study reports on the capacity of actinomycete strains isolated from Cuban soils to produce antifungal agents. The antimicrobial activities were determined by susceptibility disk assay methods. We isolated 563 different actinomycetes and 286 produced compounds with antifungal activity. Our screening method indicated the presence of many possible polyene macrolide antibiotics and the important antifungal activity in the soils rich in minerals.

In vitroandin vivoantagonism of actinomycetes isolated from Moroccan rhizospherical soils againstSclerotium rolfsii: a causal agent of root rot on sugar beet (Beta vulgarisL.)

“…This percentage was higher than those reported by many authors studying the activity of soil actinomycetes (Saadoun et al. 1998; Iznaga et al. 2004).…”

Evidences of biological control capacities of Streptomyces spp. against Sclerotium rolfsii responsible for damping-off disease in sugar beet (Beta vulgaris L.)

“…Recently, these Gram-positive filamentous bacteria have attracted more attention among researchers because of their ability to produce antifungal compounds (Kennedy 1999;Xiao et al 2002;Barakate et al 2002;Iznaga et al 2004;El-Tarabily and Sivasithamparam 2006). The role of actinomycetes in the biological control of soil-born plant pathogens has been demonstrated against different pathogens, such as Fusarium spp.…”

“…Actinomycetes are among the most widely distributed group of microorganisms in nature. They are found abundantly in all soils, in both virgin and cultivated soils, in fertile and unfertile soils, and in various regions through the world (Goodfellow and Simpson 1987;Lee and Hwang 2002;Iznaga et al 2004;El-Tarabily and Sivasithamparam 2006).…”

Actinomicetos antagónicos contra hongos fitopatógenos de importancia agrícola

“…presenta actividad antagonista contra Fusarium sp., F. solani, F. oxysporum, F. graminearum, Aspergillus parasiticus y Colletotrichum gloeosporioides. Al respecto Iznaga et al (2003), reportaron cepas de actinomicetos aisladas de suelo, que producencomponentes con actividad antifúngica, resultados similares al de este estudio. Whipps (2001) encontró que el medio de crecimiento artificial empleado genera efectos significativos en la morfología y en el desarrollo de los patógenos; asimismo, en la producción de antibióticos volátiles y no volátiles por los agentes antagonistasen respuesta a los agentes patógenos.…”