ISSN:
1610-739X
Keywords:
Key words : endophytic actinomycetes, antimicrobial activity, Streptomyces sp., rhododendron.
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
To survey endophytic actinomycetes as potential biocontrol agents against fungal diseases of rhododendron, young plants of rhododendron were surface-sterilized for use as an isolation source. Nine, six and two isolates, with distinguishing characteristics based on the macroscopic appearance of colonies, were obtained from roots, stems and leaves, respectively, suggesting that various species of actinomycetes grow in the respective organs of this plant as symbionts or parasites. On an agar medium, only isolate R-5 commonly formed a clear growth-inhibition zone against two major fungal pathogens of rhododendron, Phytophthora cinnamomi and Pestalotiopsis sydowiana, indicating that this isolate can produce antifungal material(s). Acetone extracts of a liquid culture of R-5 had a broad antimicrobial spectrum against Gram-positive bacteria, yeast and filamentous fungi. Isolate R-5 was identified as a Streptomyces sp. based on morphological, physiological and chemotaxonomical characteristics. The present results indicate that isolate R-5 is a suitable candidate for the biocontrol of diseases of rhododendron.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/PL00012978
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