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Plant and Cell Physiology, 1974, Vol. 15, No. 6 1093-1098
© 1974

Article

Fungal extracts that induce phytoalexins in sweet potato roots1

W. K. Kim2 and I. Uritani

Laboratory of Biochemistry, Faculty of Agriculture, Nagoya University Chikusa, Nagoya, Aichi 464, Japan

Soluble extracts from mycelia and conidia of two strains of Ceratocyslis fimbriata induced formation of terpenes in sweet potato root tissue. Factors inducing terpene formation are water- or 0.02 M KCl-soluble, heat stable, organic solvent-insoluble, and dialyzable, and have neither cationic nor anionic properties. They caused cellular injury of root tissue, accompanied by production of ethylene.

1This paper constitutes Part 115 of the Phytopathological Chemistry of Sweet Potato with Black Rot and Injury, and Contribution of Research Branch, Agriculture Canada, Winnipeg, Canada. This work was supported in part by a grant from the Ministry of Education, Japan.

2Present address: Research Branch, Research Station, Agriculture Canada, Winnipeg, Manitoba, Canada.

(Received July 27, 1974; )
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