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1-Octen-3-ol is formed from its primeveroside after mechanical wounding of soybean leaves

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Hydrolysis of 1-octen-3-yl β-primeveroside implemented by a system with high structure-specificity is accountable for the rapid formation of 1-octen-3-ol from soybean leaves after mechanical wounding.

Abstract

1-Octen-3-ol is a volatile compound ubiquitous in fungi; however, a subset of plant species also has the ability to form 1-octen-3-ol. Owing to its volatile nature, it has been anticipated that 1-octen-3-ol is associated with the effort of the emitter to control the behavior of the surrounding organisms; however, its ecological significance and the enzymes involved in its biosynthesis have not been fully elucidated, particularly in plants. We previously found that soybean (Glycine max) seeds contain 1-octen-3-yl β-primeveroside (pri). To elucidate the physiological significance and the biosynthesis of 1-octen-3-ol in plants, changes in the amount of 1-octen-3-yl pri during development of soybean plants was examined. A high 1-octen-3-yl pri level was found in young developing green organs, such as young leaves and sepals. Treatment of soybean leaves with methyl jasmonates resulted in a significant increase in the amount of 1-octen-3-yl pri; suggesting its involvement in defense responses. Although 1-octen-3-ol was below the detection limit in intact soybean leaves, mechanical damage to the leaves caused rapid hydrolysis of almost all 1-octen-3-yl pri to liberate volatile 1-octen-3-ol. Under the same conditions, the other glycosides, including isoflavone glycoside and linalool diglycoside, were hardly hydrolyzed. Therefore, the enzyme system to liberate aglycone from glycosides in soybean leaves should have strict substrate specificity. 1-Octen-3-yl pri might function as a storage form of volatile 1-octen-3-ol for immediate response against stresses accompanying tissue wounding.

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Acknowledgements

We would like to thank Editage (www.editage.com) for English language editing.

Funding

This work was partly supported by the financial support from Japan Society for the Promotion of science (JSPS) KAKENHI [16H02887 and 19H02887] to K.M.

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Experiment were designed by JMN and KM, and mostly conducted by JMN. LC-MS/MS analysis of glycosides of monoterpene alcohols was performed by FK and TO. The manuscript was written by JMN, TK, and KM. All authors read and approved the final manuscript.

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Correspondence to Kenji Matsui.

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Supplementary file1 (DOCX 19 kb)

11103_2021_1226_MOESM2_ESM.pptx

Supplementary file2 Supplemental Fig. S1. Effect of exposure of intact soybean leaves with linalool vapor on the chromatograms of linalyl diglycoside. A. Chromatogram of unexposed leaves. B. Chromatogram of linalool-exposed leaves. Only the peak at a retention time of 16.0 (corresponding to peak a in Fig. 3) increased after exposure (PPTX 112 kb)

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Ntoruru, J.M., Ohnishi, T., Katsumata, F. et al. 1-Octen-3-ol is formed from its primeveroside after mechanical wounding of soybean leaves. Plant Mol Biol 109, 551–561 (2022). https://doi.org/10.1007/s11103-021-01226-9

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  • DOI: https://doi.org/10.1007/s11103-021-01226-9

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