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Lookup NU author(s): Professor Michael Goodfellow
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Streptomyces sp. strain g10 exhibited strong antagonism towards Fusarium oxysporum f.sp. cubense (Foc) races 1, 2 and 4 in plate assays by producing extracellular antifungal metabolites. Treating the planting hole and roots of 4-week-old tissue-culture-derived 'Novaria' banana plantlets with strain g10 suspension (108 cfu/ml), significantly (P<0.05) reduced wilt severity when the plantlets were inoculated with 104 spores/ml Foc race 4. The final disease severity index for leaf symptom (LSI) and rhizome discoloration (RDI) was reduced about 47 and 53%, respectively, in strain g10-treated plantlets compared to untreated plantlets. Reduction in disease incidence was not significant (P<0.05) when plantlets were inoculated with a higher concentration (106 spores/ml) of Foc race 4. Rhizosphere population of strain g10 showed significant (P=0.05) increase of more than 2-fold at the end of the 3rd week compared to the 2nd week after soil amendment with the antagonist. Although the level dropped, the rhizosphere population at the end of the 6th week was still nearly 2-fold higher than the level detected after 2 weeks. In contrast, the root-free population declined significantly (P=0.05), nearly 4-fold after 6 weeks when compared to the level detected after 2 weeks. Neither growth-inhibiting nor growth-stimulating effects were observed in plantlets grown in strain g10-amended soil. © Society for Industrial Microbiology 2005.
Author(s): Getha K, Vikineswary S, Wong WH, Seki T, Ward A, Goodfellow M
Publication type: Article
Publication status: Published
Journal: Journal of Industrial Microbiology and Biotechnology
Print publication date: 01/01/2005
ISSN (print): 1367-5435
ISSN (electronic): 1476-5535
PubMed id: 15650871
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