Journal
JOURNAL OF PHYTOPATHOLOGY
Volume 149, Issue 7-8, Pages 409-413Publisher
WILEY
DOI: 10.1046/j.1439-0434.2001.00646.x
Keywords
Magnaporthe grisea; antifungal activity; rice Sekiguchi lesion mutant; tryptamine
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An antifungal compound with an infection-inhibiting activity was isolated from a rice Sekiguchi lesion (sl) mutant and identified as the indole alkaloid tryptamine. Tryptamine inhibited not only spore germination and appressorium formation of Magnaporthe grisea at high concentrations (> 600 mug/ml) but also the infection hypha formation in onion cells at low concentrations (150-300 mug/ml). Tryptamine is a normal compound of the rice sl-mutant but accumulates further in rice with a mutant-type response (Sekiguchi lesion formation) to inoculation with M. grisea spores. A mutant type of response is involved in light-enhanced resistance. The accumulation of tryptamine was not induced, however, in rice with a wild-type response (blast lesion formation). This study strongly suggests that tryptamine plays an important role as a possible factor in light-enhanced resistance in the rice sl-mutants.
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