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

Eucalyptus globulus Labill. is a widespread exotic species that contributes to the formation of fire-prone environments, great concern under climate change conditions. Therefore, sustainable practices help locals managing eucalyptus stands are needed. In this perspective, harnessing eucalyptus’ specialized metabolism as source allelochemicals can be promising approach for weed control. Thus, main goals work were evaluate herbicidal potential post-fire regenerated E. leaves against Portulaca oleracea L. and unravel physiological mechanisms behind phytotoxic action. For this, aqueous extracts fresh (FLE; 617 g FW L?1) or oven-dried (DLE; 250 DW foliar-sprayed at different dilutions in purslane seedlings. After five weeks, results revealed DLE highest dose detained greatest activity, affecting growth cellular viability. Moreover, biochemical data pointed towards an overproduction reactive oxygen species, causing harsh oxidative damage roots, where upregulation important players, like sugars, amino acids, proline, was not able reestablish redox homeostasis. Overall, study proved dried from young had potent properties P. represent feasible strategy management.