K. R. Patel, J. A. Wyman, K. A. Patel and B. J. Burden
Department of Microbiology and Immunology, School of Medicine, University of Louisville, Kentucky, 40292
Department of Entomology, University of Wisconsin, Madison, Wisconsin, 53706
Gujarat State Fertilizers Company, P.O. Fertilizernager—391 750, Dist. Vadodara, Gujarat, India
Department of Biological Sciences, Louisiana State University—Shreveport, Shreveport, Louisiana, 71115
Received 18 July 1994;
accepted 8 September 1995. ;
Available online 19 April 2002.
Abstract
A mutant ofBacillus thuringiensisvar.kurstakiproducing a dark-brown pigment was generated following UV irradiation of the culture. This pigment was characterized as melanin, based on preliminary diagnostic tests, UV, and FTIR spectral analysis. The mutant was more resistant to UV light than the parent strain and had greater insecticidal activity toward diamondback moths,Plutella xylostella
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