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Article

Herbicidal Effects and Cellular Targets of Aqueous Extracts from Young Eucalyptus globulus Labill. Leaves

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GreenUPorto-Sustainable Agrifood Production Research Centre, Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal
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REQUIMTE, LAQV, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal
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REQUIMTE, LAQV, ICBAS, Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, Rua Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal
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Author to whom correspondence should be addressed.
Academic Editors: Fabrizio Araniti, Adela M. Sánchez Moreiras and Mercedes Verdeguer
Plants 2021, 10(6), 1159; https://doi.org/10.3390/plants10061159
Received: 28 April 2021 / Revised: 29 May 2021 / Accepted: 2 June 2021 / Published: 7 June 2021
(This article belongs to the Special Issue Mode of Action of Plant Natural Products)
Eucalyptus globulus Labill. is a widespread exotic species that contributes to the formation of fire-prone environments, a great concern under climate change conditions. Therefore, sustainable practices to help locals managing eucalyptus stands are needed. In this perspective, harnessing eucalyptus’ specialized metabolism as a source of allelochemicals can be a promising approach for weed control. Thus, the main goals of this work were to evaluate the herbicidal potential of post-fire regenerated E. globulus leaves against Portulaca oleracea L. and to unravel the physiological mechanisms behind this phytotoxic action. For this, aqueous extracts of fresh (FLE; 617 g FW L−1) or oven-dried leaves (DLE; 250 g DW L−1) were foliar-sprayed at different dilutions in purslane seedlings. After five weeks, results revealed that DLE at the highest dose detained the greatest herbicidal activity, affecting purslane growth and cellular viability. Moreover, biochemical data pointed towards an overproduction of reactive oxygen species, causing harsh oxidative damage in roots, where the upregulation of important cellular players, like sugars, amino acids, and proline, was not able to reestablish redox homeostasis. Overall, this study proved that dried leaves from young E. globulus had potent herbicidal properties against P. oleracea and can represent a feasible strategy for weed management. View Full-Text
Keywords: sustainable agriculture; allelopathy; bioherbicide; phytotoxic effects; weed management sustainable agriculture; allelopathy; bioherbicide; phytotoxic effects; weed management
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MDPI and ACS Style

Pinto, M.; Soares, C.; Martins, M.; Sousa, B.; Valente, I.; Pereira, R.; Fidalgo, F. Herbicidal Effects and Cellular Targets of Aqueous Extracts from Young Eucalyptus globulus Labill. Leaves. Plants 2021, 10, 1159. https://doi.org/10.3390/plants10061159

AMA Style

Pinto M, Soares C, Martins M, Sousa B, Valente I, Pereira R, Fidalgo F. Herbicidal Effects and Cellular Targets of Aqueous Extracts from Young Eucalyptus globulus Labill. Leaves. Plants. 2021; 10(6):1159. https://doi.org/10.3390/plants10061159

Chicago/Turabian Style

Pinto, Mafalda, Cristiano Soares, Maria Martins, Bruno Sousa, Inês Valente, Ruth Pereira, and Fernanda Fidalgo. 2021. "Herbicidal Effects and Cellular Targets of Aqueous Extracts from Young Eucalyptus globulus Labill. Leaves" Plants 10, no. 6: 1159. https://doi.org/10.3390/plants10061159

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