Dr. Peter Cotty
Research Plant Pathologist
Agricultural Research Service
USDA
Division of Plant Pathology and Microbiology
Adjunct Professor

Marley Building, Room 341B
Phone: (502) 626-5049
Email: pjcotty@email.arizona.edu
 

Visit these web-sites to learn more about Dr. Cotty and his research

 
   
Background and Interests
 
Research: Aflatoxin contamination of crops is a severe problem in many parts of the world. Over the next five years we hope to develop improved methods for limiting aflatoxin contamination. Our research is directed at developing solutions to aflatoxin problems through both practical field based studies and fundamental investigations into the physiology, genetics, and biology of aflatoxin producing fungi. Field based studies emphasize industry collaborations in Arizona, Texas, and California. A key aspect of the lab's work is development of novel biocontrol strategies through close collaborations with the Arizona Cotton Research and Protection Council including development of commercial scale processes for producing biocontrol material at a grower-run facility in Phoenix. Fundamental aspects include regulation of aflatoxin biosynthesis and it's interaction with morphogenesis, divergence of aflatoxin producing fungi, hydrolase production by aflatoxin producers, identification of adaptive fungal characters, characterization of host-fungal interactions that dictate extent of contamination, epidemiology of aflatoxin contamination, and population biology of aflatoxin producers. For over a decade the laboratory has been involved in characterizing the diversity of aflatoxin producers, clarifying the etiology of contamination, describing geographical and physiological divergence among strains. This work continues and interests in both vegetative incompatibility and intra-specific competition within Aspergillus flavus remain an emphasis.

 
Selected Publications
 

Jacks T.J., Cotty P.J., Hinojosa O.. Aug 1991. Potential of animal myeloperoxidase to protect plants from pathogens. Biochem Biophys Res Commun, 178:1202-1204

Brown, R.L., Cotty, P.J., Cleveland, T.E.. Aug 1991. Reduction in Aflatoxin Content of Maize by Atoxigenic Strains of Aspergillus flavus. Journal of Food Protection, 54:623-626

Daigle, D.J. and Cotty, P.J.. Apr 1991. The influence of cysteine, cysteine analogs, and other amino acids on spore germination of Alternaria species. Can. J. Bot., 69:2353-2356

Halloin, J.M., Lee, L.S., and Cotty, P.J.. Feb 1991. Pre-ripening damage to cottonseed by Aspergillus flavus in not influenced by seed coat permeability. J. American Oil Chemists Soc., 68:522-523

Bayman, P., and Cotty, P.J.. Feb 1991. Improved media for selecting nitrate-nonutilizing mutants in Aspergillus flavus. Mycologia, 83:311-316

Daigle, D.J. and Cotty, P.J.. Feb 1991. Factors that influence germination and mycoherbicidal activity of Alternaria cassiae. Weed Technology, 5:82-86

Cotty, P.J.. Jan 1991. Effect of Harvest Date on Aflatoxin Contamination of Cottonseed. Plant Disease, 75:312-314

Cleveland, T.E. and Cotty, P.J.. Jan 1991. Invasiveness of Aspergillus flavus Isolates in Wounded Cotton Bolls is Associated with Production of a Specific Fungal Polygalacturonase. Phytopathology, 81:155-158

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