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Metabolomic study of volatile compounds emitted by lavender grown under open-field conditions: a potential approach to investigate the yellow decline disease

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Abstract

Introduction

Fine lavender and lavandin are perfume and medicinal plants originate from the South of France and are widely cultivated for their essential oils. Recently, cultivated plants suffered from a severe decline in France, due to the propagation of the yellow decline disease. This disease is caused by the stolbur phytoplasma, a bacterium transmitted by a sap-sucking insect, the planthopper.

Objectives

In order to understand the complex relationships between host plant, pest, pathogen and environment responsible for the yellow decline of lavender, we use a metabolomic approach to highlight changes in chemical emissions from asymptomatic (“healthy”) and symptomatic (“infected”) plants.

Methods

Volatile compounds produced by fine lavender and lavandin were collected in the field using a dynamic headspace extraction approach. Afterwards, compounds trapped on Tenax adsorbent were thermodesorbed and analysed using an automated thermal desorption-gas chromatography–mass spectrometry (ATD-GC–MS). Multivariate statistical analyses was performed using principal component analysis and partial least square discriminant analyses.

Results

The untargeted screening of volatiles allowed the separation of asymptomatic and symptomatic plants according to their emissions. The approach was sufficiently accurate so as to separate the emissions according to the different stages of infection. Twelve compounds were found to be deregulated metabolites of yellow disease infection, common to fine lavender (variety 7713) and lavandin (variety abrial).

Conclusion

The metabolomic approach allowed for the effective identification of chemical variations between infected and healthy plants in a complex field environment.

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modified from CRIEPPAM) (Color figure online)

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Acknowledgements

The authors acknowledge all the partners involved in the EUCLIDE project (No. 154827) co-funded by SPLP Funds (https://www.sauvegarde-lavandes-provence.org/fr/) and SUD PACA region (France). Eric Chaisse is also thanked for his support, expertise and comments on the project.

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Contributions

ES performed the experiments and analysed the data. ES, FN, XF and TM wrote the article. FN, TC, XF and TM supervised the research work. All authors read and approved the article.

Corresponding author

Correspondence to Thomas Michel.

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The authors have no conflict of interest to declare.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Stierlin, É., Nicolè, F., Costes, T. et al. Metabolomic study of volatile compounds emitted by lavender grown under open-field conditions: a potential approach to investigate the yellow decline disease. Metabolomics 16, 31 (2020). https://doi.org/10.1007/s11306-020-01654-6

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  • DOI: https://doi.org/10.1007/s11306-020-01654-6

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