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Physiology and Biochemistry

Effect of Adenosine 3,5-cyclic Monophosphate on Induction of Sclerotia in Rhizoctonia solani. T. Hashiba, Hokuriku National Agricultural Experiment Station, Joetsu, Niigata-Ken, Japan; T. Ishikawa, Institute of Applied Microbiology, University of Tokyo, Bunkyo-Ku, Tokyo. Phytopathology 68:1723-1727. Accepted for publication 6 July 1978. Copyright 1978 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-68-1723.

Adenosine 3,5-cyclic monophosphate (cyclic AMP) and dibutyryl cyclic AMP induced formation of sclerotia in the isolate U-17 of Rhizoctonia solani which is normally unable to form sclerotia. Six isolates, including P-17, formed no sclerotia even when supplied with cyclic AMP, and five isolates (including isolate 0-0) formed sclerotia spontaneously without cyclic AMP. Endogenous cyclic AMP level was higher in isolate 0-0 than in isolate U-17. High activity of phosphodiesterase, which degrades cyclic AMP, was detected in mycelia of isolates U-17 and P-17. Isolate U-17 incorporated a significant amount of cyclic AMP, but isolates 0-0 and P-17 incorporated only small amounts. The possible participation of cyclic AMP in the induction of sclerotia is discussed.

Additional keywords: anastomosis group 1, rice sheath blight fungus.