Allelopathic activity of Eucalyptus globulus leaf aqueous extract on Hordeum vulgare growth and cytogenetic behaviour

Morsi, Maissa M.; Abdelmigid, Hala M.

doi:10.21475/ajcs.2016.10.11.pne122

Cited by 15 publications

(20 citation statements)

References 15 publications

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“…aqueous extracts or leachates have been demonstrated on the germination and radicle growth of some crops such as sorghum ( Sorghum vulgare ) [ 9 ], Brassica sp. [ 10 ], eggplant ( Solanum melongena ) [ 11 ], barley ( Hordeum vulgare ) [ 12 ] or fingermillet ( Eleusine coracana ) [ 13 ], as well as on weed species: purple nutsedge ( Cyperus rotundus ) and bermudagrass ( Cynodon dactylon ) [ 14 ], or redroot pigweed ( Amaranthus retroflexus ) and barnyardgrass ( Echinochloa crus-galli ) [ 15 ]. Our previous results in greenhouse conditions demonstrated the bioherbicide potential of eucalyptus leaves incorporated into the soil as a green manure, pointing out different modes of action for target species and attributing the phytotoxic effects probably to the release of water-soluble compounds into the soil solution [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Unravelling the bioherbicide potential of Eucalyptus globulus Labill: Biochemistry and effects of its aqueous extract

et al. 2018

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In the worldwide search for new strategies in sustainable weed management, the use of plant species able to produce and release phytotoxic compounds into the environment could be an effective alternative to synthetic herbicides. Eucalyptus globulus Labill. is known to be a source of biologically active compounds responsible for its phytotoxic and allelopathic properties. Our previous results demonstrated the bioherbicide potential of eucalyptus leaves incorporated into the soil as a green manure, probably through the release of phytotoxins into the soil solution. Thus, the aims of this study were to understand the phytotoxicity of the eucalyptus leaves aqueous extract applied in pre- and post-emergence, and to identify and quantify its potentially phytotoxic water-soluble compounds. The effects were tested on the germination and early growth of the model target species Lactuca sativa and Agrostis stolonifera, and on physiological parameters of L. sativa adult plants after watering or spraying application. Dose-response curves and ED50 and ED80 values for eucalyptus aqueous extracts revealed pre-emergence inhibitory effects on both target species, effects being comparable to the herbicide metolachlor. While spraying treatment reduced the aerial and root biomass and increased the dry weight/fresh weight ratio of lettuce adult plants, watering application reduced protein contents and chlorophyll concentrations with respect to control, reflecting different modes of action depending on the site of phytotoxin entry. Via HPLC analyses, a total of 8 phenolic compounds (chlorogenic, two ρ-coumaric derivatives, ellagic, hyperoside, rutin, quercitrin, and kaempferol 3-O-glucoside) and other 5 low weight organic acids (citric, malic, shikimic, succinic and fumaric acids) were obtained from aqueous extract, the latter being identified for the first time in E. globulus. Despite some phytotoxic effects were found on lettuce adult plants, the use of eucalyptus aqueous extract would be discarded in post-emergence, whereas it was promising as a pre-emergence bioherbicide.

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Section: Introductionmentioning

confidence: 99%

Unravelling the bioherbicide potential of Eucalyptus globulus Labill: Biochemistry and effects of its aqueous extract

et al. 2018

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“…The herbicidal potential of E. globulus leaf extracts has been explored by some authors (Ataollahi et al, 2014;Babu and Kandasamy, 1997;Dejam et al, 2014;Morsi and Abdelmigid, 2016;Padhy et al, 2000;Puig et al, 2018). However, most of these studies focused on the preemergent activity of E. globulus extracts, evaluating their effects only on seed germination and seedling growth.…”

Section: Discussionmentioning

confidence: 99%

“…so far evaluated the biocidal potential of E. globulus extracts in a pre-emergence context, concluding that they are capable of effectively impairing seed germination and seedling growth of Solanum nigrum L. (Ataollahi et al, 2014), Solanum melongena L. (Dejam et al, 2014), and Hordeum vulgare L. (Morsi and Abdelmigid, 2016), leaving much to clarify about the postemergent biocidal properties of E. globulus aqueous extracts.…”

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confidence: 99%

Aqueous Extracts Prepared with Young <em>E. globulus L</em>eaves as a Biocide - A Novel Post-Fire Management Strategy of Eucalyptus Stands

Pinto¹,

Soares²,

Martins³

et al. 2021

Preprint

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Along with climate change, the native forest replacement by exotic species, such as Eucalyptus globulus, is contributing to a highly fire-prone environment. Since E. globulus detains several post-fire regeneration strategies, sustainable practices are needed to manage eucalyptus stands. Thus, eucalyptus allelopathic potential can be used for weed control. Therefore, this study aimed at assessing the herbicidal potential of post-fire regenerated E. globulus leaves in Portulaca oleracea, and unraveling the main physiological processes disturbed by biocide application. For this, an aqueous extract prepared with fresh leaves (FLE; 617 gfresh weightL-1) and other with oven-dried leaves (DLE; 250 gdry weightL-1) were prepared and foliar-sprayed twice-a-week at different dilutions in 7-days-old purslane plants. As positive control, glyphosate was used. After five weeks, results revealed that DLE at the highest dose detained the greatest herbicidal activity against P. oleracea. To understand how DLE impacted weed physiology, several biochemical and redox-related parameters were evaluated in purslane plants treated with DLE highest dose. Results suggested an overproduction of hydrogen peroxide, causing severe oxidative damage in roots. Overall, this study showed that young E. globulus dried leaves had powerful herbicidal properties against P. oleracea and can represent a feasible approach for weed management, while reducing fire hazard.

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“…The cytotoxic and genotoxic effects were much less evaluated. Under the influence of leaf extracts of E. globulus the Hordeum vulgare L. plants demonstrated significant mitotic abnormalities such as disturbed metaphases and anaphases and chromatin bridge [55]. In another survey, the comet assay and semi-quantitative RT-PCR methods were used to assess the genotoxic impact of the E. globulus leaves on soybean genome [56].…”

Section: Allelopathic Tree Speciesmentioning

confidence: 99%

…Fell Upas Sits, the Hydra-Tree of Death †, or the Phytotoxicity of Trees

2019

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The use of natural products that can serve as natural herbicides and insecticides is a promising direction because of their greater safety for humans and environment. Secondary metabolites of plants that are toxic to plants and insects—allelochemicals—can be used as such products. Woody plants can produce allelochemicals, but they are studied much less than herbaceous species. Meanwhile, there is a problem of interaction of woody species with neighboring plants in the process of introduction or invasion, co-cultivation with agricultural crops (agroforestry) or in plantation forestry (multiclonal or multispecies plantations). This review describes woody plants with the greatest allelopathic potential, allelochemicals derived from them, and the prospects for their use as biopesticides. In addition, the achievement of and the prospects for the use of biotechnology methods in relation to the allelopathy of woody plants are presented and discussed.

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Allelopathic activity of Eucalyptus globulus leaf aqueous extract on Hordeum vulgare growth and cytogenetic behaviour

Cited by 15 publications

References 15 publications

Unravelling the bioherbicide potential of Eucalyptus globulus Labill: Biochemistry and effects of its aqueous extract

Unravelling the bioherbicide potential of Eucalyptus globulus Labill: Biochemistry and effects of its aqueous extract

Aqueous Extracts Prepared with Young <em>E. globulus L</em>eaves as a Biocide - A Novel Post-Fire Management Strategy of Eucalyptus Stands

…Fell Upas Sits, the Hydra-Tree of Death †, or the Phytotoxicity of Trees

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