Indole derivatives enhance resistance against the rice blast fungus <Emphasis Type="Italic">Magnaporthe oryzae</Emphasis> |
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| Authors: | Makoto Ueno Yumiko Kumura Kana Ueda Junichi Kihara Sakae Arase |
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| Institution: | (1) Laboratory of Plant Pathology, Faculty of Life and Environmental Science, Shimane University, Matsue 690-8504, Japan |
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| Abstract: | In leaves pretreated with an indole derivative indole-3-acetic acid (IAA) tryptamine, or tryptophan], blast lesion formation
was suppressed compared to those treated with distilled water (DW) as a control. Phenylalanine ammonia-lyase (PAL) activity
and PAL expression were significantly enhanced in the IAA- or tryptophan-pretreated leaves, but not in tryptamine-pretreated leaves.
This induction of resistance was inhibited by pretreatment with a PAL inhibitor, α-aminooxyacetic acid, in IAA- and in tryptophan-treated
leaves, but not in tryptamine-treated leaves. This study strongly shows that the indole derivatives IAA tryptamine and tryptophan
can enhance a disease resistance mechanism that is supported by different metabolic pathways. |
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