2021, Number 1
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TIP Rev Esp Cienc Quim Biol 2021; 24 (1)
Chemical composition and phytotoxic potential of Eucalyptus globulus essential oil against Lactuca sativa and two herbicide-resistant weeds: Avena fatua and Amaranthus hybridus
Flores-Macías A, Reyes-Zarate GG, Gomes CCA, López-Ordaz R, Campos GJ, Ramos-López MÁ
Language: English
References: 30
Page:
PDF size: 180.66 Kb.
ABSTRACT
Weed control in sustainable agriculture requires new bioherbicidal molecules to replace synthetic herbicides that have damaged the
environment and generated resistance in weeds. This study was conducted to investigate the chemical composition of
Eucalyptus
globulus essential oil and to explore its bioherbicidal potential on the germination and radicle growth inhibition. The phytotoxic effects
of
E. globulus essential oil (1, 10 and 20 µL mL
-1) were tested in comparison to those of the synthetic herbicide Glyphosate (1, 10 and
20 µL mL
-1) in bioassays of germination and radicle growth of Lactuca sativa and the resistant weeds Avena fatua and Amaranthus
hybridus. Gas Chromatography with Flame Ionization Detector and Gas Chromatography-Mass Spectroscopy analysis showed that
major monoterpenes comprised 1,8-Cineole (86.94%), α-pinene (7.71%), d-limonene (2.65%), and p-cymene (1.48%). The seed
germination and radicle length exhibited different degrees of inhibition in response to the concentration of
E. globulus essential oil.
At some concentrations, both the Glyphosate herbicide and the
E. globulus essential oil demonstrated the same phytotoxicity against
the resistant weeds
A. fatua and
A. hybridus. Essential oil bioactivity Lethal Concentration (LC
50) in the majority of cases was lowest
for
A. hybridus, followed by
A. fatua and
L. sativa. Based on the results, it can be concluded that
E. globulus essential oil possesses
phytotoxic potential and could be explored as a bioherbicide for resistant weeds management programs.
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