Corresponding author: Ekaterina Kozuharova ( ina_kozuharova@yahoo.co.uk ) Academic editor: Plamen Peikov
© 2020 Ekaterina Kozuharova, Niko Benbassat, Strahil Berkov, Iliana Ionkova.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Kozuharova E, Benbassat N, Berkov S, Ionkova I (2020) Ailanthus altissima and Amorpha fruticosa – invasive arboreal alien plants as cheap sources of valuable essential oils. Pharmacia 67(2): 71-81. https://doi.org/10.3897/pharmacia.67.e48319
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The high tolerance of various habitat conditions and potent propagation ability of Ailanthus altissima (Mill.) Swingle (Simaroubaceae) and Amorpha fruticosa L. (Fabaceae) promote their aggressive invasive behaviour. Additionally, they not only over-compete the local vegetation but suppress the seed development. In the newly invaded habitats they might not have suitable herbivores to control their populations. The aim of this review is to evaluate the potential of A. altissima and A. fruticosa, as cheap sources of valuable essential oils. The essential oils yield and compostion of both plant species vary significantly depending on plant parts, origin and time of collection. The main constituents of A. altissima essential oil are α-curcumene, α-gurjunene, γ-cadinene, α-humulene β-caryophyllene caryophyllene oxide, germacrene D etc. The main constituents of A. fruticosa are δ-cadinene, γ-cadinene, β-caryophyllene γ-muurolene +, ar-curcumene, myrcene etc. These essential oils have been reported to possess different activities such as antimicrobial, insect repellent, insecticidal and herbicidal activity. Due to the fact that these are aggressive invasive species, they can provide abundant and cheap resources. Additionally, future industrial exploitation of the biomass of these invasive plants for essential oils’ extraction might contribute to biodiversity conservation by relieving their destructive impact on the natural habitats.
essential oils, pharmacological activity, invasive plants, Ailanthus altissima Amorpha fruticosa
Ailanthus altissima
(Mill.) Swingle, (Simaroubaceae) and Amorpha fruticosa L. (Fabaceae), are alien plant species which have high tolerance of various habitat conditions and elevated propagation ability. They demonstrate aggressive invasive behaviour. They not only overcompete the local plants but also suppress their seed germination and seedling development. In the newly invaded habitats they practically do not have suitable herbivores to control their populations (
In their native range of distribution these plants have been recognized as useful for remedial purpouses. In many parts of Asia including China the bark and the leaves of A. altissima have been used tradittionally against leucorrhoea, diarrhea; to treat cold, dysentery, endoparasites and gastric diseases (
The aim of this mini review is to evaluate the potential of Ailanthus altissima and Amorpha fruticosa, as cheap sources of valuable essential oils.
Material for essential oil of Ailanthus altissima is collected in September in Horacia, (
The plant material of Amorpha fruticosa used for essential oil extraction is as follows: fresh or air-dried crushed fruits harvested at four stages of maturity (formation of fruits, unripe fruits, ripe fruits and ripe fruits after slight frost (
Ailanthus altissima
(family Simaroubaceae, Tree of heaven) is a deciduous tree with a smooth, grey bark, alternate, odd-pinnate compound leaves with 11–25 lanceolate leaflets, numerous small flowers, clustered in panicles and seeds centred in a papery sheath (samara). It is native to Asia and globally invasive plant cultivated as ornamental and went out of control (
The essential oil of Ailanthus altissima varies considerably (Table
Chemical composition (%) of Ailanthus altissima essential oil – a compilation of [1] -
Components | Quantyty of terpenes in the essential oil | |||||||
---|---|---|---|---|---|---|---|---|
Source of information | [1] | [2] | [3] | |||||
leaf Y mg/kg | leaf O mg/kg | leaf % | root % | stem % | leaf % | flower % | samara% | |
hexadecanal | 0.17–0.40 | 22.60 | 4.50 | 0.30 | ||||
(E)-2-hexenal | 8.21 | 0.36 | 1.80 | |||||
(Z)-3-hexen-l-yl acetate | 21.89 | 2.29 | ||||||
(Z)-3-hexen-l-ol | 40.63 | 12.18 | ||||||
(Z)-3-hexen-l-yl butanoate | 22.52 | – | ||||||
(Z)-3-hexen-l-yl hexanoate | 4.42 | < 0.05 | ||||||
hexadecanoic (palmitic) acid | 13.05 | < 0.05 | 0.29–0.85 | |||||
tetradecanol | 0.1–10.65 | |||||||
heneicosane | 0.2–10.65 | |||||||
docosane | 0.96–11.7 | |||||||
tricosane | 0.61–8.63 | |||||||
calarene | 5.26 | 4.70 | ||||||
(Z)-caryophyllene | 10.90 | |||||||
β-caryophyllene | 19.37 | 24.60 | 0.81–2.14 | 1.20 | 18.90 | 0.80 | 2.90 | |
α-curcumene | 4.00–6.86 | |||||||
α-gurjunene | 3.36–3.89 | |||||||
α-humulene | 3.34 | 7.48 | 1.04–4.47 | 6.50 | 0.60 | 1.20 | ||
γ-cadinene | 20.00 | 25.33 | 0.20–0.39 | 2.40 | 0.70 | 0.80 | ||
δ-cadinene | 3.79 | 3.26 | 1.15–1.63 | 2.80 | 3.10 | |||
γ-cadinol | 3.20 | 2.80 | 5.20 | 5.70 | ||||
α-cadinol | 1.70 | 4.10 | 6.20 | 8.30 | 0.90 | |||
α-Terpinen-7-al | 3.06–3.81 | |||||||
caryophyllene oxide | 0.19 | 0.80 | 8.30 | 22.70 | 42.50 | 2.60 | ||
germacrene D | 0.24–0.26 | 15.50 | 10.30 | 2.00 | ||||
hexahydrofarnesyl acetone | 0.40 | 0.70 | 15.40 | 5.00 | 58.40 | |||
linalool | 5.26 | 0.60 | 0.69–0.76 | 0.50 | 1.00 | 8.40 | 2.10 | |
β-cyclocitral | 3.58 | 2.53 | 0.36–2.00 | |||||
α-terpineol | 2.11 | tr | 0.11–0.36 | 1.90 | ||||
geraniol | 1.05 | 0.36 | 0.41–1.67 | |||||
cis-jasmone | 2.53 | 2.41 | ||||||
neophytadiene | 7.58 | 2.65 |
The high content of γ-cadinene (Fig.
The presence of α-humulene (Fig.
It is shown experimentally that the essential oil of Ailanthus altissima negatively affects the seed germination and early stage development of the seedlings of the target species. The effect is dose dependant as well as it is greater in the light than in the dark. Also the phytotoc effect depends on the origin of the essential oil, as the oil extracted from flowers is most phytotoxic (
The essential oil of Ailanthus altissima bark has a fumigant activity – it can be used to kill insects that damage stored foods or seeds. The tests show potent fumigant activity against Oryzaephilus surinamensis (Linnaeus) (Coleoptera: Silvanidae), Sitophilus oryzae (Linnaeus) (Coleoptera: Curculionidae) with 99.3 and 81.9% mortality within 24 h respectively and although fumigant activity is weak against Tribolium castaneum (Herbst) (Coleoptera: Tenebrionidae), and Liposcelis paeta Pearman (Psocoptera: Liposcelididae) adults it notably repells T. castaneum adults and L. paeta nymphae (
Amorpha fruticosa
L. (family Fabaceae, indigo bush) is a shrub with a stem of 1–3 m, extensive root system, with odd-pinnate compound leaves with stipules. Leaflets 9–35 ovate or elliptical, entire. The purple flowers are clustered in racemes. The fruit is an indehiscent pod of 8–9 mm coverd with glands and containing 1 or 2 seeds. The plant is native to North America, and it is widely distributed in the US, southern Canada and northern Mexico (
The essential oil of Amorpha fruticosa fruits varies qualitatively and quantitatively (Table
Chemical composition (%) of Amorpha fruticosa essential oil – a compilation of [1]–
Components | Quantyty of terpenes in the essential oil | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Source of information | [1] | [2] | [3] | [4] | [5] | [6] | ||||||
Flower oil | ||||||||||||
α-eudesmol | 15.80 | |||||||||||
β-eudesmol | 7.80 | |||||||||||
δ-cadinene | 6.20 | |||||||||||
(E)-nerolidol | 6.10 | |||||||||||
Leaf oil | ||||||||||||
α-eudesmol | 13.90 | |||||||||||
(E)-β-ocimene | 11.90 | |||||||||||
α-pinene | 11.80 | |||||||||||
Fruit oil | Formation to ripe fruit | Bulgaria ripe fruit | Poland ripe fruit | Unripe to dried ripe fruit | 6 to 40 months storage | Loc. S1 Nov. 2011 | Loc. S2 Oct. 2011 | Loc. S3 Oct. 2014 | MHD-LLD EOf | MHD-LLD EOs | MHD | HD |
Yield | 0.32–0.72 | 0.60 | 1.40 | 0.45–1.36 | 0.83–0.76 | 1.30 | 1.50 | 1.80 | ||||
α-pinene | 1.20–4.10 | 4.90 | 19.55 | 25.80–19.60 | 5.70–4.50 | 3.82 | 10.86 | 0.91 | 5.55 | 4.75 | 5.07 | |
myrcene | 0.80–1.60 | 1.59 | 17.90 | 13.30–18.70 | 0.50–0.40 | 4.62 | 1.38 | 0.66 | ||||
α-copaene | 4.84 | 2.25 | 1.70–2.30 | 4.20–4.00 | 7.65 | 1.70 | 8.11 | 6.80 | ||||
bicyclosesquiphellandrene | 8.98 | 7.44 | 8.09 | |||||||||
γ-cadinene | 7.90–10.70 | 9.53 | 3.41 | 2.10–2.80 | 6.70–6.70 | 5.34 | 3.19 | 7.21 | 6.97 | 9.84 | 7.99 | 6.65 |
δ-cadinene | 14.40–17.30 | 14.93 | 6.89 | 5.10–6.90 | 11.40–12.50 | 5.72 | 5.82 | 7.77 | 12.10 | 3.32 | 12.22 | 15.01 |
β- caryophyllene | 11.5–5.20 | 5.20 | 4.08 | 2.30–4.10 | 6.00–5.400 | 4.79 | 3.20 | 2.66 | ||||
caryophyllene | 9.62 | 8.74 | 10.67 | |||||||||
γ-muurolene + | 13.20–18.10 | 13.10 | 4.50 | 4.30–5.30 | 16.70–10.60 | 7.17 | 7.30 | 9.85 | 10.61 | 9.61 | 13.88 | 11.52 |
ar-curcumene | 12.20–18.10 | 12.10 | 7.00 | 4.80–6.00 | 0.00–8.60 | |||||||
α-zingiberene | 2.40–6.90 | 5.76 | 1.73 | 1.20–1.70 | 7.63 | 5.79 | 6.88 | |||||
α-eudesmol | 2.30–0.90 | 1.17 | 2.40 | 3.60–2.40 | 4.30–4.00 | 7.89 | 5.65 | 6.51 | ||||
γ-eudesmol | 0.6-<1.00 | <1.00 | 0.58 | 0.70–0.60 | 2.40–2.20 | 2.11 | 15.12 | 2.28 | 2.02 | |||
isolongifolene | 7.51 | |||||||||||
isolongifolol | 0.51 | 8.34 | 0.63 | 0.50 | ||||||||
Monoterpene hydrocarbons | 3.00–8.00 | 8.00 | 46.00 | 46.00 | 12.73 | 21.1 | 5.72 | |||||
Oxygenated monoterpenes | <1.00 | 1.00 | 1.00 | 0.00 | 0.96 | 6.57 | 1.22 | |||||
Sesquiterpene hydrocarbons | 86.00–94.00 | 84.00 | 46.00 | 46.00 | 47.35 | 41.38 | 57.08 | |||||
Oxygenated sesquiterpenes | 2.00–9.00 | 4.00 | 7.00 | 8.00 | 18.58 | 11.21 | 13.41 |
The high content of α-pinene, γ-muurolene, myrcene, γ-cadinene and δ-cadinene (Fig.
The essential oil of Amorpha fruticosa is not tested yet for its phytotoxicity effect. However it is known that α-pinene, caryophyllene, muurolene and cadinene possess phytotoxic activity (
The essential oil of Amorpha fruticosa is poorly tested for its fumgant and repellent activity with few experimental research but the results are promising (
Some plant essential oils repel insects. They even have contact and fumigant insecticidal actions against specific pests (
The Ailanthus altissima essential oil has phytotoxic and potent fumigant activity demonstrated by a number of research papers. It is prospective as a bio-pesticide because natural products are biodegradable and possibly less harmful to the humans’ health. The fumigant and herbicide effects of Amorpha fruticosa essential oil is poorly studied experimentally. However there are some indications for such activity based on the main constituents of the essenial oil and it may appear a prospective bio-pesticide. The experimentally testesd antimicrobial activity of the essential oils of both plant species is evaluated as moderate.
Applcation of essential oils from these arboreal invasive plants agains pests and weeds can help to reduce the use the of synthetic pesticides which are known with their negative effects on the wild bees and honeybees (
This work has been carried out in the framework of the Grant Д-79/23.04.2019, Project 8276/20.11.2019 to Council of Medicinal Science at Medical University of Sofia. Our thanks to the graduate student Kristina Stoycheva for the assistance in the working process.