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Isolation and characterization of endophytic Streptomyces strains from surface‐sterilized tomato ( Lycopersicon esculentum ) roots

Isolation and characterization of endophytic Streptomyces strains from surface‐sterilized tomato... Aims: To isolate endophytic Streptomyces strains from tomato and examine their antimicrobial activity. Methods: Endophytic Streptomyces strains were isolated using surface‐sterilization methods and identified by morphological characteristics. Antimicrobial activities were measured by the agar plate sensitivity method. Antifungal activity in vivo was measured by seedling mortality in infested soils. Results: Twenty‐one per cent of endophytic streptomycete isolates produced antibacterial metabolites and 41% produced antifungal metabolites in S medium. Sixty‐five per cent of the most frequently isolated strains inhibited the growth of Rhizoctonia solani by the antibiosis assay but only 32% produced metabolites active against R. solani in S medium. Growth promotion and enhanced disease resistance of seedlings inoculated with Streptomyces sp. strain S30 were observed in tomato but not in cucumber seedlings. Conclusions: Endophytic Streptomyces spp. strains were successfully isolated using stringent methods and strain S30 promoted growth and enhanced resistance to R. solani in tomato seedlings. Significance and Impact of the Study: Endophytic streptomycetes showing antifungal activity in vitro and in vivo may indicate the potential for their use as biocontrol agents particularly of R. solani disease of tomato seedlings. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Letters in Applied Microbiology Wiley

Isolation and characterization of endophytic Streptomyces strains from surface‐sterilized tomato ( Lycopersicon esculentum ) roots

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References (21)

Publisher
Wiley
Copyright
Copyright © 2004 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0266-8254
eISSN
1472-765X
DOI
10.1111/j.1472-765X.2004.01606.x
pmid
15482433
Publisher site
See Article on Publisher Site

Abstract

Aims: To isolate endophytic Streptomyces strains from tomato and examine their antimicrobial activity. Methods: Endophytic Streptomyces strains were isolated using surface‐sterilization methods and identified by morphological characteristics. Antimicrobial activities were measured by the agar plate sensitivity method. Antifungal activity in vivo was measured by seedling mortality in infested soils. Results: Twenty‐one per cent of endophytic streptomycete isolates produced antibacterial metabolites and 41% produced antifungal metabolites in S medium. Sixty‐five per cent of the most frequently isolated strains inhibited the growth of Rhizoctonia solani by the antibiosis assay but only 32% produced metabolites active against R. solani in S medium. Growth promotion and enhanced disease resistance of seedlings inoculated with Streptomyces sp. strain S30 were observed in tomato but not in cucumber seedlings. Conclusions: Endophytic Streptomyces spp. strains were successfully isolated using stringent methods and strain S30 promoted growth and enhanced resistance to R. solani in tomato seedlings. Significance and Impact of the Study: Endophytic streptomycetes showing antifungal activity in vitro and in vivo may indicate the potential for their use as biocontrol agents particularly of R. solani disease of tomato seedlings.

Journal

Letters in Applied MicrobiologyWiley

Published: Nov 1, 2004

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