An antifungal antibiotic produced by a strain of Streptomyces aureofaciens. At least one company has incorporated the gene for this antibiotic (which acts against wheat take-all disease) into a Pseudomonasfluorescens, to be used to confer resistance to wheat take-all disease. This is done by allowing the bacteria to colonize the wheat’s roots. In this way the plant obtains the benefits of the antibiotic because the bacteria become a part of the plant.