Substantial UV-B-mediated induction of essential oils in sweet basil (Ocimum basilicum L.)

Johnson, Christopher; Kirby, J. M.; Naxakis, George; Pearson, Simon

doi:10.1016/s0031-9422(98)00767-5

Cited by 142 publications

(77 citation statements)

References 18 publications

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“…Likewise, an opposite trend was observed in relative abundances of GARD B and pebrellin, a potential precursor of GARD B lacking only the 6-O-methyl group, which was attributed to changes in the expression of a F6OMT (Voirin and Bayet, 1992). This observation is in line with previous studies on terpene composition in basil (Johnson et al, 1999), peppermint (Brun et al, 1991), and thyme (Thymus vulgare; Yamaura et al, 1992) but contrasts with recent findings (Fischer et al, 2011) that the relative concentrations of several essential oil components in basil are strongly predetermined by the leaf position and vary little throughout leaf development.…”

Section: Line-specific Profiles Of External Flavones Are Conserved Thsupporting

confidence: 90%

A Set of Regioselective O-Methyltransferases Gives Rise to the Complex Pattern of Methoxylated Flavones in Sweet Basil

2012

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Polymethoxylated flavonoids occur in a number of plant families, including the Lamiaceae. To date, the metabolic pathways giving rise to the diversity of these compounds have not been studied. Analysis of our expressed sequence tag database for four sweet basil (Ocimum basilicum) lines afforded identification of candidate flavonoid O-methyltransferase genes. Recombinant proteins displayed distinct substrate preferences and product specificities that can account for all detected 7-/6-/49-methylated, 8-unsubstituted flavones. Their biochemical specialization revealed only certain metabolic routes to be highly favorable and therefore likely in vivo. Flavonoid O-methyltransferases catalyzing 49-and 6-O-methylations shared high identity (approximately 90%), indicating that subtle sequence changes led to functional differentiation. Structure homology modeling suggested the involvement of several amino acid residues in defining the proteins' stringent regioselectivities. The roles of these individual residues were confirmed by site-directed mutagenesis, revealing two discrete mechanisms as a basis for the switch between 6-and 49-O-methylation of two different substrates. These findings delineate major pathways in a large segment of the flavone metabolic network and provide a foundation for its further elucidation.

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Section: Line-specific Profiles Of External Flavones Are Conserved Thsupporting

confidence: 90%

A Set of Regioselective O-Methyltransferases Gives Rise to the Complex Pattern of Methoxylated Flavones in Sweet Basil

2012

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“…UV-B or combined UV-A and UV-B light with white light was more effective than white light alone in increasing l-menthol and limonene concentrations in M. arvensis [55] as well as the content of essential oils in Chinese liquorice, such as glycyrrhizic acid, liquiritin, liquiritigenin, and isoliquiritigenin [56]. Two weeks of supplemental UV-B light for 2.5 h each day enriched the levels of phenylpropanoid and terpenoid concentrations in sweet basil, which were three times higher than the plants under sunlight [52]. Therefore, supplemental red, blue, and UV light treatments could be used as effective processes to enhance plant phytochemical biosynthesis and provide great commercial advantages.…”

Section: Essential Oilsmentioning

confidence: 91%

“…Sakalauskaite et al [49] reported that both 1 h and 2 h supplemental UV-B light per day for seven days increased plant height, leaf area, FW, and DW of sweet basil, and 2 h UV-B treatment had a greater effect than 1 h UV-B treatment. In contrast, a long exposure time at a low intensity or a short exposure time at a high intensity of supplemental UV-B light both decreased net photosynthetic rate of Chinese liquorice (Glycyrrhiza uralensis) [50], and reduced the leaf area and leaf DW of sweet basil and perilla [51,52]. Therefore, the effects of light intensity and exposure times of UV light on plant production needs further investigation.…”

Section: Photosynthetically Less-efficient Lights: Far-red Green Anmentioning

confidence: 99%

Effects of Light Quality on Growth and Phytonutrient Accumulation of Herbs under Controlled Environments

Dou

Niu²,

et al. 2017

Horticulturae

142

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Abstract:In recent years, consumption of herb products has increased in daily diets, contributing to the prevention of cardiovascular diseases, chronic diseases, and certain types of cancer owing to high concentrations of phytonutrients such as essential oils and phenolic compounds. To meet the increasing demand for high quality herbs, controlled environment agriculture is an alternative and a supplement to field production. Light is one of the most important environmental factors influencing herb quality including phytonutrient content, in addition to effects on growth and development. The recent development and adoption of light-emitting diodes provides opportunities for targeted regulation of growth and phytonutrient accumulation by herbs to optimize productivity and quality under controlled environments. For most herb species, red light supplemented with blue light significantly increased plant yield. However, plant yield decreased when the blue light proportion (BP) reached a threshold, which varied among species. Research has also shown that red, blue, and ultraviolet (UV) light enhanced the concentration of essential oils and phenolic compounds in various herbs and improved antioxidant capacities of herbs compared with white light or sunlight, yet these improvement effects varied among species, compounds, and light treatments. In addition to red and blue light, other light spectra within the photosynthetically active region-such as cyan, green, yellow, orange, and far-red light-are absorbed by photosynthetic pigments and utilized in leaves. However, only a few selected ranges of light spectra have been investigated, and the effects of light quality (spectrum distribution of light sources) on herb production are not fully understood. This paper reviews how light quality affected the growth and phytonutrient accumulation of both culinary and medicinal herbs under controlled environments, and discusses future research opportunities to produce high quantity and quality herbs.

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“…In particular, the induction and release of such compounds depends on the interaction of biotic factors, such as hormones (de Bruxelles & Roberts, 2001;Thaler et al, 2002;Farmer et al, 2003;Rojo et al, 2003;Ament et al, 2004;van Poecke & Dicke, 2004), herbivore-derived elicitors (Alborn et al, 1997;Halitschke et al, 2001;Schmelz et al, 2001;Arimura et al, 2005) and associated microorganisms (Cardoza et al, 2002), and on abiotic factors, such as mechanical wounding (Schmelz et al, 2001;Mithöfer et al, 2005), O3 and CO2 concentration (Vuorinen et al, 2004a, b), UV radiation (Johnson et al, 1999;Winter & Rostás, 2008), heavy metals (Mithöfer et al, 2004), temperature (Gouinguené & Turlings, 2002) and light (Takabayashi et al, 1994;Gouinguené & Turlings, 2002).…”

Section: Introductionmentioning

confidence: 99%

Changes in the volatile profile of Brassica oleracea due to feeding and oviposition by Murgantia histrionica (Heteroptera: Pentatomidae)

Conti¹,

Zadra²,

Salerno³

et al. 2008

Eur. J. Entomol.

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Abstract. The mixture of volatile compounds emitted by Brassica oleracea var. sabauda changed significantly in response to feeding and/or oviposition by Murgantia histrionica (Heteroptera: Pentatomidae). Volatiles were collected from (1) healthy plants and those with (2) feeding punctures, (3) a combination of feeding punctures and oviposition, (4) feeding punctures and one hatched egg mass and (5) plants bearing only an egg mass. In the case of plants with feeding punctures or feeding punctures plus an egg mass, the volatiles were also collected at different time intervals after plants were subjected to these two treatments (0-24 h, 24-48 h and 48-72 h). Gas chromatographic and gas chromatograph-mass spectrometric analysis showed that the percent emission of several compounds changed significantly from plants subjected to the feeding and oviposition or just oviposition. Percentage of terpenes generally decreased after feeding and oviposition, although the percentage emission of (E)--caryophyllene from these plants and those with just feeding punctures significantly increased. Plants with just an egg mass emitted linalool de novo but not (E)--ocimene. The emission of jasmonates, mainly methyl jasmonate, increased from plants with feeding punctures plus an egg mass compared to those with only an egg mass. Higher percentages of the volatile glucosinolate derivatives (VGSs), mainly 4-methoxy-3-indolylacetonitrile, were emitted by plants with feeding punctures and an egg mass. The percentage emission of most of these compounds increased during the first 24 h after the treatment and then decreased over the next 24 h, except for methyl jasmonate, which remained high also 48-72 h later. The possible ecological roles of such volatiles in plant interactions with the second and third trophic levels are discussed.

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Substantial UV-B-mediated induction of essential oils in sweet basil (Ocimum basilicum L.)

Cited by 142 publications

References 18 publications

A Set of Regioselective O-Methyltransferases Gives Rise to the Complex Pattern of Methoxylated Flavones in Sweet Basil

A Set of Regioselective O-Methyltransferases Gives Rise to the Complex Pattern of Methoxylated Flavones in Sweet Basil

Effects of Light Quality on Growth and Phytonutrient Accumulation of Herbs under Controlled Environments

Changes in the volatile profile of Brassica oleracea due to feeding and oviposition by Murgantia histrionica (Heteroptera: Pentatomidae)

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