Metabolomics characterizes early metabolic changes and markers of tolerant Eucalyptus ssp. clones against drought stress

A - Papers appearing in refereed journals

Noleto-Dias, C., De T. Picoli E. A., Porzel, A., Wessjohann L. A., Tavares Josean F. and Farag, M. A. 2023. Metabolomics characterizes early metabolic changes and markers of tolerant Eucalyptus ssp. clones against drought stress. Phytochemistry. 212, p. 113715. https://doi.org/10.1016/j.phytochem.2023.113715

AuthorsNoleto-Dias, C., De T. Picoli E. A., Porzel, A., Wessjohann L. A., Tavares Josean F. and Farag, M. A.
Abstract

Eucalyptus: L’H´er. (Myrtaceae) is one of the economically most important and widely cultivated trees for wood crop purposes worldwide. Climatic changes together with the constant need to expand plantations to areas that do not always provide optimal conditions for plant growth highlight the need to assess the impact of abiotic stresses on eucalypt trees. We aimed to unveil the drought effect on the leaf metabolome of commercial clones with differential phenotypic response to this stress. For this, seedlings of 13 clones were grown at well-watered (WW) and water-deficit (WD) conditions and their leaf extracts were subjected to comparative analysis using ultra-high performance liquid chromatography coupled to mass spectrometry (UPLC-MS) and nuclear magnetic resonance spectroscopy (NMR). UPLC-MS and NMR analyses led to the annotation of over 100 molecular features of classes such as cyclitols, phenolics, flavonoids, formylated phloroglucinol compounds (FPCs) and fatty acids. Multivariate data analysis was employed for specimens’ classifications and markers identification from both platforms. The results obtained in this work allowed us to classify clones differing in drought tolerance. Classification models were validated using an extra subset of samples. Tolerant plants exposed to water deficit accumulated arginine, gallic acid derivatives, caffeic acid and tannins at higher levels. In contrast, stressed drought-sensitive clones were characterised by a significant reduction in glucose, inositol and shikimic acid levels. These changes in contrasting drought response eucalypt pave ways for differential outcomes of tolerant and susceptible phenotypes. Under optimal growth conditions, all clones were rich in FPCs. These results can be used for early screening of tolerant clones and to improve our understanding of the role of these biomarkers in Eucalyptus tolerance to drought stress.

KeywordsEucalyptus ; Myrtaceae; UPLC-MS ; NMR Phenolics ; Flavonoids; Formylated phloroglucinols ; Water deficit
Year of Publication2023
JournalPhytochemistry
Journal citation212, p. 113715
Digital Object Identifier (DOI)https://doi.org/10.1016/j.phytochem.2023.113715
Open accessPublished as green open access
Accepted author manuscript
Copyright license
CC BY
Output statusPublished
Publication dates
Online06 May 2023
Publication process dates
Accepted05 May 2023
PublisherElsevier
ISSN0031-9422

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