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Microbe Plant Interactions

Pathotoxin Effects in Sorghum Are Also Produced by Mercuric Chloride Treatment ¹

Department of Botany and Plant Pathology, Purdue University, West Lafayette, Indiana 47907

Pathogenic isolates of Periconia circinata produce a host-specific toxin (PC-toxin) and cause a root and crown rot in susceptible genotypes of sorghum. Treatment with PC-toxin leads to selective development of disease symptoms and an increase in synthesis of a group of acidic, low molecular weight proteins only in susceptible genotypes. Treatment of sorghum seedlings or excised root tips with HgCl₂ resulted in responses indistinguishable from those produced by treatment with PC-toxin, but the effects were not genotype specific.

³ Present address: Department of Microbiology, North Carolina State University, Raleigh, NC 27695.

¹ Joint contribution from the Department of Botany and Plant Pathology, Purdue University Agricultural Experiment Station and the United States Department of Agriculture Agricultural Research Service. Journal Paper No. 11,093 from the Purdue University Agricultural Experiment Station. Mention of a trademark or proprietary product does not constitute a guarantee or warranty of the product by either the United States Department of Agriculture or Purdue University and does not imply its approval to the exclusion of other products that may also be suitable.