Metabolic fingerprinting analysis of oil palm reveals a set of differentially expressed metabolites in fatal yellowing symptomatic and non-symptomatic plants
Oil palm (E. guineensis), the most consumed vegetable oil in the world, is affected by fatal yellowing (FY), a condition that can lead to the plant’s death. Although studies have been performed since the 1980s, including investigations of biotic and abiotic factors, FY’s cause remains unknown and efforts in researches are still necessary.
This work aims to investigate the metabolic expression in plants affected by FY using an untargeted metabolomics approach.
Metabolic fingerprinting analysis of oil palm leaves was performed using ultra high liquid chromatography–electrospray ionization–mass spectrometry (UHPLC–ESI–MS). Chemometric analysis, using principal component analysis (PCA) and partial least square discriminant analysis (PLS-DA), was applied to data analysis. Metabolites identification was performed by high resolution mass spectrometry (HRMS), MS/MS experiments and comparison with databases and literature.
Metabolomics analysis based on MS detected more than 50 metabolites in oil palm leaf samples. PCA and PLS-DS analysis provided group segregation and classification of symptomatic and non-symptomatic FY samples, with a great external validation of the results. Nine differentially expressed metabolites were identified as glycerophosphorylcholine, arginine, asparagine, apigenin 6,8-di-C-hexose, tyramine, chlorophyllide, 1,2-dihexanoyl-sn-glycero-3-phosphoethanolamine, proline and malvidin 3-glucoside-5-(6″-malonylglucoside). Metabolic pathways and biological importance of those metabolites were assigned.
Nine metabolites were detected in a higher concentration in non-symptomatic FY plants. Seven are related to stress factors i.e. plant defense and nutrient absorption, which can be affected by the metabolic depression of these compounds. Two of those metabolites (glycerophosphorylcholine and 1,2-dihexanoyl-sn-glycero-3-phosphoethanolamine) are presented as potential biomarkers, since they have no known direct relation to plant stress.
KeywordsMetabolomics Fatal yellowing Oil palm Chemometrics High resolution mass spectrometry Biomarkers
The authors would like to thank the Brazilian Agricultural Research Corporation (EMBRAPA), the Federal Foundation for the Brazilian Research and Development (FINEP) and Coordination for the Improvement of Higher Education Personnel (CAPES) for the financial support; and Marborges Agroindustry S.A. for the E. guineensis leaves samples. The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The Grant (01.13.0315.02—DendePalm Project) for this study was awarded by the Brazilian Ministry of Science, Technology and Innovation (MCTI) via the Brazilian Innovation Agency (FINEP). The authors confirm that the funder had no influence over the study design, the content of article, or selection of this journal.
PVA designed and JCRN/JAAR performed the experiments. JCRN, ALS and MVC derived the models and analyzed the data. LRV and MTSJ performed the biological interpretations. PVA and JCRN wrote the manuscript in consultation with MVC, ALS, LRV, CMR and MTSJ. All authors read and approved the manuscript.
Compliance with ethical standards
Conflict of interest
All authors declare that they have no conflict of interest.
Research involving human and animal participants
This article does not contain any studies with human and/or animal participants performed by any of the authors.
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