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Article Addendum

Induction of serotonin accumulation by feeding of rice striped stem borer in rice leaves

Atsushi Ishihara, Yumi Hashimoto, Hisashi Miyagawa and Kyo Wakasa

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Tryptophan (Trp)-related secondary metabolism has been implicated in the defense against pathogen infection and insect feeding in various gramineous species. Recently, we also reported that rice plant accumulated serotonin and tryptamine as well as their amide compounds coupled with phenolic acids in response to the infection by fungal pathogen. These compounds were likely to play an important role in the formation of physical barrier to the invading pathogens. To extend our study to elucidate the defensive role of Trp-derived secondary metabolism in gramineous plants, we examined in this study whether it is activated in response to herbivore attack as well. Third leaves of rice plant were fed on by third instar larvae of rice striped stem borer for 24 h or 48 h. The analysis of four Trp-derived metabolites including tryptamine, serotonin feruloyltryptamine (FerTry) and p-coumaroylserotonin (CouSer) by liquid chromatography coupled with tandem mass spectrometry revealed that their contents clearly increased in response to the larvae feeding. The respective amounts of tryptamine, serotonin, FerTry and CouSer in the larvae-fed leaves were 12-, 3.5-, 33-, and 140-fold larger than those in control leaves 48 h after the start of feeding.

Addendum to: Ishihara A, Hashimoto Y, Tanaka C, Dubouzet JG, Nakao T, Matsuda F, Nishioka T, Miyagawa H, Wakasa K. The tryptophan pathway is involved in the defense responses of rice against pathogenic infection via serotonin production. Plant J 2008; 54:481-95.

Authors

Atsushi Ishihara

Division of Applied Life Sciences; Graduate School of Agriculture; Kyoto University; Kyoto, Japan; CREST; Plant Function and Their Control; Japan Science and Technology Agency; Tokyo, Japan

Yumi Hashimoto

Division of Applied Life Sciences; Graduate School of Agriculture; Kyoto University; Kyoto, Japan; CREST; Plant Function and Their Control; Japan Science and Technology Agency; Tokyo, Japan

Hisashi Miyagawa

Division of Applied Life Sciences; Graduate School of Agriculture; Kyoto University; Kyoto, Japan; CREST; Plant Function and Their Control; Japan Science and Technology Agency; Tokyo, Japan

Kyo Wakasa

CREST; Plant Function and Their Control; Japan Science and Technology Agency; Tokyo, Japan; Department of Agriculture; Tokyo University of Agriculture; Atsugi, Japan

Purchase article for $19

Subscribe to this journal for $79/year