Exogenous Paclobutrazol Reinforces the Antioxidant and Antimicrobial Properties of Lavender (Lavandula officinalis L.) Oil throughModulating Its Composition of Oxygenated Terpenes
Salwa M. El-sayed;
Abstract
Plant growth regulators can affect the primary and secondary metabolites of various
plant species. However, the effect of paclobutrazol (PBZ) on the composition of lavender oil, especially
related to the terpenoid pathway, is still unclear in literatures. In this study, the effect of
PBZ as a foliar spray (0.200, 400 and 600 ppm) on the vegetative growth, phytochemical content,
and both antioxidant and antimicrobial properties of lavender oil were investigated. The results
indicated that all examined PBZ treatments led to a significant (p 0.05) decrease in growth parameters
compared to the untreated plants. Meanwhile, the yield of essential oil was significantly
decreased by the treatment of PBZ at 200 ppm compared to the control. In contrast, applied-PBZ
significantly enhanced the chlorophyll content and displayed a marked change in the composition of
the essential oil. This change included an obvious and significant increase in 3-carene, eucalyptol,
–terpinene, -pinocarvone, caryophyllene, -vetivenene, -santalol, ledol, geranyl isovalerate,
farnesol, caryophyllene oxide, and phytol percentage. Generally, the highest significant values were
achieved by the treatment of 400 ppm compared to the other treatments. Furthermore, this treatment
showed the highest free radical scavenging activity against DPPH (1,1-diphenyl-2-picrylhydrazyl) by
13% over the control. Additionally, to determine the antimicrobial activities of the extracted oil, each
treatment was examined against two strains of Gram positive bacteria (S. aureus and B. cereus), two
strains of Gram negative bacteria (S. enteritidis and E. coli), and two fungal species (C. albicans and A.
niger) represent the yeast modal and filamentous fungus, respectively. The findings demonstrated
that all examined species were more sensitive to the oil that was extracted from lavender plants,
treated with 400 ppm PBZ, compared to the other concentrations.
plant species. However, the effect of paclobutrazol (PBZ) on the composition of lavender oil, especially
related to the terpenoid pathway, is still unclear in literatures. In this study, the effect of
PBZ as a foliar spray (0.200, 400 and 600 ppm) on the vegetative growth, phytochemical content,
and both antioxidant and antimicrobial properties of lavender oil were investigated. The results
indicated that all examined PBZ treatments led to a significant (p 0.05) decrease in growth parameters
compared to the untreated plants. Meanwhile, the yield of essential oil was significantly
decreased by the treatment of PBZ at 200 ppm compared to the control. In contrast, applied-PBZ
significantly enhanced the chlorophyll content and displayed a marked change in the composition of
the essential oil. This change included an obvious and significant increase in 3-carene, eucalyptol,
–terpinene, -pinocarvone, caryophyllene, -vetivenene, -santalol, ledol, geranyl isovalerate,
farnesol, caryophyllene oxide, and phytol percentage. Generally, the highest significant values were
achieved by the treatment of 400 ppm compared to the other treatments. Furthermore, this treatment
showed the highest free radical scavenging activity against DPPH (1,1-diphenyl-2-picrylhydrazyl) by
13% over the control. Additionally, to determine the antimicrobial activities of the extracted oil, each
treatment was examined against two strains of Gram positive bacteria (S. aureus and B. cereus), two
strains of Gram negative bacteria (S. enteritidis and E. coli), and two fungal species (C. albicans and A.
niger) represent the yeast modal and filamentous fungus, respectively. The findings demonstrated
that all examined species were more sensitive to the oil that was extracted from lavender plants,
treated with 400 ppm PBZ, compared to the other concentrations.
Other data
Title | Exogenous Paclobutrazol Reinforces the Antioxidant and Antimicrobial Properties of Lavender (Lavandula officinalis L.) Oil throughModulating Its Composition of Oxygenated Terpenes | Authors | Salwa M. El-sayed | Keywords | chemical composition;Lavandula officinalis L.;Gas chromatography-mass spectrometry (GC-MS);monoterpene and sesquiterpene | Issue Date | 19-Jun-2022 | Publisher | MDPI | Journal | MDPI | Volume | 11 | Issue | 1607 | Start page | 1 | End page | 17 | DOI | https://doi.org/10.3390/ plants11121607 |
Attached Files
File | Description | Size | Format | |
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plants.pdf | 3.44 MB | Unknown | View/Open |
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