Chemical constituents, antioxidant and potential allelopathic effect of the essential oil from the aerial parts of Cullen plicata

Using synthetic chemicals in industry and agriculture has led to several environmental problems. Thus, plant products derived from volatile oils (VOs) could be a potential green source for bioherbicides. Little is known about the VOs of Lactuca serriola. Hence, the present study aimed to characterize the VOs chemical composition from the aerial parts of L. serriola, assessment of antioxidant activity, and evaluate allelopathic potential against the noxious weed Bidens pilosa. The VOs were extracted by hydrodistillation and analyzed by GC/MS. The VOs from the Egyptian ecospecies of L. serriola were found to comprise 34 compounds mainly oxygenated sesquiterpenes and diterpenes. The major compounds were isoshyobunone (64.22 %), isocembrol (17.35 %), and alloaromadendrene oxide‐1 (7.32 %). So, L. serriola can be considered as a good source for isoshyobunone, considering that it has a much higher concentration than any other plants. Also, this plant has a high content of the oxygenated diterpene compound, isocembrol, which is rarely found in the VOs of most plants. The VOs expressed strong antioxidant activity. Also, for the first time, our results showed a strong allelopathic activity of VOs from L. serriola on germination and seedling growth of the noxious weed, B. pilosa. We suppose that the activity of the VOs from L. serriola could be attributed to these previously mentioned major compounds, as they represent about 89 % of the total identified oil constituents. Nevertheless, to evaluate these compounds as new allelochemicals, further study is needed to test the allelopathic activity of authenticated standard of these compounds either singular or in combination on several weeds as well as evaluate the safety, and improve the efficacy and stability at the field scale.

Section: Allelopathic Activity Of the Vosmentioning

confidence: 99%

Section: Allelopathic Activity Of the Vosmentioning

confidence: 99%

Preponderance of Oxygenated Sesquiterpenes and Diterpenes in the Volatile Oil Constituents of Lactuca serriola L. Revealed Antioxidant and Allelopathic Activity

Abd‐ElGawad

Elshamy

Gendy

et al. 2019

“…[16,23,24] Nerolidol was reported as the main constituent of the EO of several plants, in which it was found in a concentration of 33.5 % in the leaves of Baccharis dracunculifolia DC., [25] 17.9 % in the aerial parts of Cullen plicata (DELILE) C.H. STIRT., [8] and 6.6 % in the needles of Juniperus rigida SIEBOLD & ZUCC. [26] Some studies reported nerolidol as a major constituent of the EO from other Cleome species such as C. chrysantha DECNE.…”

Section: Essential Oil Compositionmentioning

confidence: 99%

“…The sensitivity of root toward the allelopathic effect could be attributed to the permeability of the root membrane as well as the direct touch with the allelochemicals. [8,36] The root is the first organ absorbing allelochemicals from the environment which directly inhibit cell division in the apical meristems of root tip. [37] Moreover, allelochemicals have been reported to possess a significant effect on both physiological and biochemical behavior of plants including respiration, photosynthesis, cell division, cell differentiation, plant-water relation, enzyme activity, nucleic acid, signal transduction, as well as gene expression.…”

Section: Allelopathic Activity Of the Eomentioning

confidence: 99%

“…[6 -8] Moreover, EOs possess various biological activities including anticancer, antioxidant, antimicrobial activities, and allelopathy. [7][8][9][10] Aromatic medicinal plants represent a large part of the natural flora of Egyptian deserts, where they are considered as an important natural resource used in various fields such as the cosmetic and pharmaceutical industries. [11] The genus Cleome (L.) DC.…”

Section: Introductionmentioning

confidence: 99%

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Essential Oil Composition, Antioxidant and Allelopathic Activities of Cleome droserifolia (Forssk.) Delile

El-Gawad

El‐Amier

Bonanomi

2018

People rely on the synthetic chemical pesticides in most of the agricultural practices, which have a serious problem on human health and ecosystem. Essential oil (EO), derived from wild plants, offers a new opportunity to explore eco‐friendly green biocides. This study aimed to characterize the chemical constituents of EO from Egyptian ecospecies of Cleome droserifolia (Forssk.) Delile and evaluate its antioxidant and allelopathic potential. The EO was extracted from aerial parts by hydrodistillation and analyzed by GC/MS. To assess the allelopathic potential, EO concentrations from 50 to 200 μL L−1 were tested on Trifolium repens and three weeds. Antioxidant activity was determined using DPPH. Hydrodistillation yielded 0.64 % of dark yellow oil, which comprises 35 compounds, in which sesquiterpene was a major class and represented by 61.97 % of the total essential oil. Moreover, the dominant sesquiterpenes are cis‐nerolidol, α‐cadinol, δ‐cadinene, and γ‐muurolene. The speed of germination index, shoot and root length of clover and weeds were reduced in a concentration‐dependent manner. The IC50 values of C. droserifolia EO on germination of T. repens, Cuscuta trifolii, Melilotus indicus, and Chenopodium murale were 181.6, 183.5, 159.0, and 157.5 μL L−1, respectively. From the obtained data, we concluded that C. droserifolia EO could provide a hope to produce environment‐friendly bioherbicide as well as a natural resource of antioxidants.

Allelopathic Activity and Chemical Composition of Rhynchosia minima (L.) DC. Essential Oil from Egypt

El-Gawad

El‐Amier

Bonanomi

2017

Self Cite

Aromatic plants attract the attention of many researchers worldwide due to their worthy applications in agriculture, human prosperity, and the environment. Essential oil (EO) could be exploited as effective alternatives to synthetic compounds as it has several biological activities including allelopathy. The EO from the aerial parts of Rhynchosia minima was extracted by hydrodistillation and investigated by gas chromatography/mass spectrometry (GC/MS). Different concentrations (50, 100, 150 and 200 lL L À1 ) of the EO were prepared for investigation of their allelopathic potential on two weeds; Dactyloctenium aegyptium and Rumex dentatus. Twenty-eight compounds, mainly sesquiterpenes (69.13%) were determined. The major compounds are a-eudesmol, 2-allyl-5-tertbutylhydroquinone, caryophyllene oxide, trans-caryophyllene, and s-cadinol. The EO from the R. minima showed a significant inhibition of D. aegyptium and R. dentatus germination, while the seedling growth was stimulated. Therefore, it is not recommended to treat these noxious weeds with the EO of R. minima before the germination. In contrast, the apparent stimulatory effect on the seedling growth offers further studies to use the EO of R. minima to enhance the fitness of different economic crops. However, characterization of green bio-herbicides such as EO (allelochemicals) from wild plants raises a new opportunity for the incorporation of new technology of bio-control against the noxious weeds.