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. 1994 Jan;60(1):78–85. doi: 10.1128/aem.60.1.78-85.1994

Cloning of Genes Involved in the Synthesis of Pyrrolnitrin from Pseudomonas fluorescens and Role of Pyrrolnitrin Synthesis in Biological Control of Plant Disease

D S Hill 1, J I Stein 1, N R Torkewitz 1, A M Morse 1, C R Howell 2, J P Pachlatko 3, J O Becker 3,†, J M Ligon 1,*
PMCID: PMC201272  PMID: 16349167

Abstract

A soil isolate of Pseudomonas fluorescens (BL915) was shown to be an effective antagonist of Rhizoctonia solani-induced damping-off of cotton. Investigation of the biological basis of this antagonism revealed that the strain produces pyrrolnitrin, a secondary metabolite known to inhibit R. solani and other fungi. Mutants of strain BL915 that did not produce pyrrolnitrin and did not suppress damping-off of cotton by R. solani were generated by exposure to N-methyl-N′ -nitro-N-nitrosoguanidine. A gene region that was capable of restoring pyrrolnitrin production to the non-pyrrolnitrin-producing mutants and of conferring this ability upon two other P. fluorescens strains not otherwise known to produce this compound or to be capable of suppressing damping-off caused by R. solani was isolated from strain BL915. The non-pyrrolnitrin-producing strains (mutants of BL915 and the other two P. fluorescens strains) which synthesized pyrrolnitrin after the introduction of the gene region from strain BL915 were also shown to be equal to strain BL915 in their ability to suppress R. solani-induced damping-off of cotton. These results indicate that we have isolated from P. fluorescens BL915 a gene(s) that has a role in the synthesis of pyrrolnitrin and that the production of this compound has a role in the ability of this strain to control damping-off of cotton by R. solani.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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