ANTIBIOTICS AND ENZYMES PRODUCED BY THE BIOCONTROL AGENT STREPTOMYCES-VIOLACEUSNIGER YCED-9

Citation
Sr. Trejoestrada et al., ANTIBIOTICS AND ENZYMES PRODUCED BY THE BIOCONTROL AGENT STREPTOMYCES-VIOLACEUSNIGER YCED-9, Journal of industrial microbiology & biotechnology, 21(1-2), 1998, pp. 81-90
Citations number
41
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Biothechnology & Applied Migrobiology
Volume
21
Issue
1-2
Year of publication
1998
Pages
81 - 90
Database
ISI
SICI code
Abstract
Streptomyces violaceusniger strain YCED-9 is an antifungal biocontrol agent antagonistic to many different classes of plant pathogenic fungi . We discovered that strain YCED-9 produces three antimicrobial compou nds with antifungal activity. These compounds were purified and identi fied, and included: AFA (Anti-Fusarium Activity), a fungicidal complex of polyene-like compounds similar to guanidylfungin A and active agai nst most fungi except oomycetes; nigericin, a fungistatic polyether; a nd geldanamycin, a benzoquinoid polyketide highly inhibitory of myceli al growth of Pythium and Phytophthora spp, Antimicrobial assays were d eveloped to estimate the production of each antibiotic independently. Medium composition had differential effects on the production of each metabolite. The hydrolytic enzymes chitinase and beta-1,3-glucanase ar e also produced under induction by colloidal chitin and laminarin, res pectively. Fungal cell walls induced the production of both enzymes. A potential for biological control of diseases caused by P. infestans w as also suggested by strain YCED-9's strong in vitro antagonism toward s pathogenic isolates of this fungus.