REVIEW article
Front. Plant Sci.
Sec. Plant Metabolism and Chemodiversity
This article is part of the Research TopicExploring the Role of Plant Phytochemical Diversity in Biodiversity and BeyondView all 3 articles
Chemodiversity, Biosynthetic Regulation, and Functional Roles of Eucalyptus Phenolics: Applications and Prospects
Provisionally accepted
- 1Universidad de Talca Instituto de Ciencias Biologicas, Talca, Chile
- 2Universidad Mayor, Santiago, Chile
- 3University of Talca, Talca, Chile
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Eucalyptus species constitute a rich reservoir of bioactive phenolic compounds. In contrast to the extensively characterized essential oils, the non-volatile phenolic fraction remains fragmented across the literature and insufficiently integrated from biochemical, ecological, and applied perspectives. This review synthesizes current evidence on the structural diversity, tissue distribution, and biosynthetic regulation of Eucalyptus phenolics, and uniquely bridges their ecological functions with their translational relevance in pharmaceutical, agricultural (biopesticides), and environmental applications. Quantitative analyses indicate that lignified organs such as bark and stump wood consistently contain the highest phenolic concentrations, reaching 474.9 mg/g in E. camaldulensis bark, whereas foliar tissues show pronounced intra-and interspecific variation driven by extraction polarity. We identify a critical gap in the field: although over 103 phenolic compounds have been documented, many reports lack methodological standardization, quantitative reproducibility, and chemometric alignment, limiting their comparability and downstream industrial translation. Across organs, several dominant phenolics are recurrently identified, including ellagic acid, epicatechin, gallic acid, quercetin-glucuronide, and sinapic acid. Bark of E. urograndis, E. grandis, and E. camaldulensis is especially enriched in ellagitannins and flavan-3-ols, while leaf extracts of E. globulus accumulate high levels of glucuronidated flavonols. Distinctive metabolites, including rosmarinic acid, occur only in E. marginata. Beyond compositional surveys, this review examines biosynthetic regulation, ecological roles, and emerging technological applications. We highlight that persistent challenges include extraction standardization, metabolic engineering, and the design of biodelivery systems. Overall, this review positions Eucalyptus phenolics as strong candidates for innovation, while providing a clearer roadmap to overcome persistent limitations, particularly in compound-specific bioactivities, transcriptional and metabolic regulatory pathways, and genotype–environment–management interactions.
Keywords: bioavailability, Ellagitannins (ETs), Extraction technologies, metabolic profiling, Phenylpropanoid pathway
Received: 27 Oct 2025; Accepted: 08 Dec 2025.
Copyright: © 2025 Pérez-Martínez, Maldonado and Mora-Poblete. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence:
Carlos Maldonado
Freddy Mora-Poblete
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