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Indole‐related Compounds Induce the Resistance to Rice Blast Fungus, Magnaporthe grisea in Barley
Author(s) -
Ueno M.,
Kihara J.,
Honda Y.,
Arase S.
Publication year - 2004
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.1439-0434.2004.00903.x
Subject(s) - magnaporthe grisea , tryptamine , biology , magnaporthe , tryptophan , inoculation , indole test , appressorium , fungicide , phenylalanine ammonia lyase , spore , microbiology and biotechnology , fungus , oryza sativa , botany , peroxidase , biochemistry , horticulture , enzyme , amino acid , gene
When barley leaves pretreated with indole‐3‐acetic acid (IAA), tryptamine and tryptophan solutions at 50 μ g/ml, which did not show antifungal activity, were inoculated with Magnaporthe grisea spores 24 h after chemical pretreatments, both blast lesion and infection‐hypha formations were significantly inhibited. Such resistance to M. grisea in barley was induced from 12 h after the pretreatment. In barley leaves pretreated with IAA, tryptamine and tryptophan at 50 μ g/ml, phenylalanine ammonia‐lyase (PAL), peroxidase and chitinase activities were already significantly enhanced before M. grisea inoculation, when compared with that in distilled water (DW)‐treated leaves as a control. In chemical‐pretreated leaves, furthermore, H 2 O 2 generation was observed by M. grisea inoculation before lesion formation, but not in DW‐pretreated leaves as a control even by M. grisea inoculation. These results suggested that indole‐related compounds IAA, tryptamine and tryptophan can protect barley from M. grisea as functioning as the plant activator. Studies on indole‐related compounds may contribute to develop new plant activators for disease control.