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  • Induced accumulation of tyramine, serotonin, and related amines in response to Bipolaris sorokiniana infection in barley.

Induced accumulation of tyramine, serotonin, and related amines in response to Bipolaris sorokiniana infection in barley.

Bioscience, biotechnology, and biochemistry (2017-05-10)
Atsushi Ishihara, Rie Kumeda, Noriko Hayashi, Yukari Yagi, Nanase Sakaguchi, Yu Kokubo, Naoki Ube, Shin-Ichi Tebayashi, Kotomi Ueno
ABSTRACT

The inducible metabolites were analyzed in barley leaves inoculated with Bipolaris sorokiniana, the causal agent of spot blotch of barley. HPLC analysis revealed that B. sorokiniana-infected leaves accumulated 4 hydrophilic compounds. They were purified by ODS column chromatography and preparative HPLC. Spectroscopic analyses revealed that they were tyramine (1), 3-(2-aminoethyl)-3-hydroxyindolin-2-one (2), serotonin (3), and 5,5'-dihydroxy-2,4'-bitryptamine (4). Among these, 2 and 4 have not been reported as natural products. They showed antifungal activity in an assay of inhibition of B. sorokiniana conidia germination, suggesting that they play a role in the chemical defense of barley as phytoalexins. The accumulation of 1-4 was examined also in the leaves of rice and foxtail millet. Rice leaves accumulated 2, 3, and 4, whereas foxtail millet leaves accumulated 3 and 4 in response to pathogen attack, suggesting the generality of accumulation of 3 and 4 in the Poaceae species.

MATERIALS
Product Number
Brand
Product Description

Supelco
Serotonin, analytical standard