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Light‐Dependent Accumulation of Tryptamine in the Rice Sekiguchi Lesion Mutant Infected with Magnaporthe grisea
Author(s) -
Arase S.,
Ueno M.,
Toko M.,
Honda Y.,
Itoh K.,
Ozoe Y.
Publication year - 2001
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.2001.tb03871.x
Subject(s) - magnaporthe grisea , tryptamine , mutant , appressorium , biology , magnaporthe , spore , hypha , microbiology and biotechnology , lesion , indole test , oryza sativa , biochemistry , gene , psychology , psychiatry
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 μ g/ml) but also the infection hypha formation in onion cells at low concentrations (150‐300 μ g/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.