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Molecules 2018, 23(2), 276; doi:10.3390/molecules23020276

Xylosylated Detoxification of the Rice Flavonoid Phytoalexin Sakuranetin by the Rice Sheath Blight Fungus Rhizoctonia solani

College of Agriculture, Ibaraki University, 3-21-1 Chuo, Ami, Ibaraki 300-0393, Japan
Author to whom correspondence should be addressed.
Received: 13 December 2017 / Revised: 26 January 2018 / Accepted: 26 January 2018 / Published: 29 January 2018
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Sakuranetin (1) is a rice flavanone-type phytoalexin. We have already reported that the metabolites from the detoxification of 1 by Pyricularia oryzae are naringenin (2) and sternbin. In this study, we investigated whether the rice sheath blight fungus Rhizoctonia solani, another major rice pathogen, can detoxify 1. The extract of R. solani suspension culture containing 1 was analyzed by LC-MS to identify the metabolites of 1. Three putative metabolites of 1 were detected in the extract from the R. solani suspension culture 12 h after the addition of 1, and they were identified as 2, sakuranetin-4′-O-β-d-xylopyranoside (3), and naringenin-7-O-β-d-xylopyranoside (4) by NMR, LC-MS/MS, and GC-MS analyses. The accumulation of 2, 3, and 4 reached their maximum levels 9–12 h after the addition of 1, whereas the content of 1 decreased to almost zero within 9 h. The antifungal activities of 3 and 4 against R. solani were negligible, and 2 showed weaker antifungal activity than 1. We concluded that 2, 3, and 4 are metabolites from the detoxification of 1 by R. solani. Xylosylation is a rare and efficient detoxification method for phytoalexins. View Full-Text
Keywords: phytoalexin; flavonoid; rice; Rhizoctonia solani; xylosylation phytoalexin; flavonoid; rice; Rhizoctonia solani; xylosylation

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Katsumata, S.; Toshima, H.; Hasegawa, M. Xylosylated Detoxification of the Rice Flavonoid Phytoalexin Sakuranetin by the Rice Sheath Blight Fungus Rhizoctonia solani. Molecules 2018, 23, 276.

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