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Plant and Cell Physiology, 1990, Vol. 31, No. 8 1117-1122
© 1990

Article

The Occurrence of Lipid Hydroperoxide-Decomposing Activities in Rice and the Relationship of Such Activities to the Formation of Antifungal Substances

Hiroyuki Ohta1,3, Kan Shida1, You-Liang Peng2, Iwao Furusawa2, Jiko Shishiyama2, Shigeo Aibara1 and Yuhei Morita1

1Research Institute for Food Science, Kyoto University Uji Kyoto, 611 Japan
2Laboratory of Plant Pathology, Faculty of Agriculture Kyoto University, Kyoto, 606 Japan

3 Address for correspondence: National Institute for Basic Biology, Myodaiji, Okazaki, 444 Japan

Two fractions that decomposed lipid hydroperoxide (lipid hydroperoxide-decomposing activities), were isolated from rice seeds by ion-exchange chromatography on DEAE-Toyopearl. Thin-layer chromatography showed that both fractions generated two products (I and II) when 9-linoleate hydroperoxide (9-LOOH) was used as a substrate. Structural analysis by gas chromatography/mass spectrometry showed that products I and II were 9-hydroxyoctadecadienoic acid and 9,12,13-trihydroxyoctadec-lO-enoic acid, respectively, which have been isolated from rice leaves as antifungal substances that are active against rice blast fungus. The antifungal activity of 9-LOOH was examined against the blast fungus and compared with that of product I. Both compounds strongly inhibited conidial germination, growth of germ tubes and formation of appressoria at 50ppm. Product I was more active in this assay than 9-LOOH.

(Received October 18, 1989; Accepted September 4, 1990)
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