Chemical Constituents and Antibacterial Activity of Essential Oils of Needles of Pinus Sylvestris (Scots Pine) from South West Nigeria

Botrytis allii and B. cinerea are important seed-transmitted pathogens of onion. The aim of this study was to determine the chemical compositions of fir, pine and thyme essential oils and evaluate their effects on the germination, vigour and health of onion seeds. Gas Chromatography/Mass Spectroscopy was used for the analysis of the oils’ chemical compositions. Seed germination, vigour and health tests were performed on untreated seeds and on seeds treated with volatile compounds of the oils applied at a concentration of 0.2 µL cm−3 for 6, 12, 24, 48 and 72 h or at a concentration of 0.4 µL cm−3 for 3, 6 and 12 h. The main components of fir oil were bornyl acetate (55.5%) and α-pinene (15.6%), pine oil contained mostly α-pinene (35.5%) and β-pinene (18.6%), and thymol (34.2%) and p-cymene (26.2%) prevailed in thyme oil. Almost all treatments significantly reduced seed infestation with Alternaria alternata and Fusarium spp., and some effectively controlled Botrytis spp., however, seed health improvement was usually associated with deterioration of seed germination and vigour. Only treatment with fir oil at a concentration of 0.2 µL cm−3 for 6 h effectively controlled seed-borne pathogens and positively affected seed germination. Considering the beneficial effect of the oils on seed health, further studies are necessary in order to establish the optimal conditions for onion seed treatment.

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“…Oyewole et al [28] reported high activity of pine essential oil against Micrococcus luteus and Klebsiella pneumonia.…”

Section: Introductionmentioning

confidence: 99%

Chemical Composition of Fir, Pine and Thyme Essential Oils and Their Effect on Onion (Allium cepa L.) Seed Quality

2021

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“…The main sesquiterpenes are β-caryophyllene, germacrene D, bicyclogermacrene, δ-cadinene, γ-cadinene, germacrene D-4-ol, cubenol and α-cadinol [4,5]. Research has shown that essential oil exhibits antiparasitic, anti-hyperglycemic, anti-allergenic, anti-viral, anti-spasmodic properties, as well as insecticidal and larvicidal properties [6,7].…”

Section: Introductionmentioning

confidence: 99%

Heavy Metals and Sulphur in Needles of Pinus sylvestris L. and Soil in the Forests of City Agglomeration

Figas

Siwik-Ziomek

Kobierski

2021

Forests

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The content of sulphur and copper (Cu), iron (Fe), manganese (Mn), zinc (Zn) and of assimilation pigments in the needles of Scots pine (Pinus sylvestris L.) in the forests of Bydgoszcz, Poland was determined. The content of those metals and the activity of dehydrogenases (DHA) in the rhizosphere of the trees was assayed. The average total sulphur (TS) content in 2-year-old pine needles was 832.4 mg kg−1 d.w. No significant correlation was found between TS and Cu, Fe, Mn and Zn in needles and the content of assimilation pigments indicating no phytotoxic effect of sulphur dioxide (SO2) and metals on Scots pine. The content of metals in the needles pointed to an inconsiderable degree of human impact. The soils in the surface layer were not contaminated with heavy metals. With the principal component analysis (PCA) two principal components were identified which accounted for 68% of the total change in variation. The variables that determined the principal components were the soil content of organic carbon (TOC), total nitrogen (TN), TS and sulphates (SO42−), the soil content of Mn, Zn, available forms to plants of Cu, Mn, and the content of Cu, Fe in needles.

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Chemical Constituents and Antibacterial Activity of Essential Oils of Needles of Pinus Sylvestris (Scots Pine) from South West Nigeria

Cited by 2 publications

References 24 publications

Chemical Composition of Fir, Pine and Thyme Essential Oils and Their Effect on Onion (Allium cepa L.) Seed Quality

Chemical Composition of Fir, Pine and Thyme Essential Oils and Their Effect on Onion (Allium cepa L.) Seed Quality

Heavy Metals and Sulphur in Needles of Pinus sylvestris L. and Soil in the Forests of City Agglomeration

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