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T.w. Ashenden - One of the best experts on this subject based on the ideXlab platform.
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the effect of long term ozone fumigation on the growth physiology and frost sensitivity of Calluna vulgaris
New Phytologist, 1996Co-Authors: J. P. Foot, Simon J.m. Caporn, John A. Lee, T.w. AshendenAbstract:summary Calluna vulgaris (1) Hull, plants were fumigated in open-top chambers with ambient charcoal-filtered air, or 70 nl 1−1 (70 ppb) ozone, for 8 h a day, five days a week. Ozone treatment during the winter increased the frost sensitivity of plants as measured by electrolyte leakage following a controlled frosting regime. Root growth was decreased and the allometric root-.shoot ratio (k) was reduced by the ozone treatment, reflecting a decrease in the partitioning of carbon to the roots. There was no significant effect of ozone on instantaneous net photosynthesis. There was a significant increase in anthocyanin content in ozone-fumigated plants, but no effect on chlorophyll content. In contrast with the effects of wintertime exposure, plants treated during summer showed no significant responses. These results suggest that Calluna vulgaris can be adversely affected by prolonged ozone episodes in the field, particularly if these are followed by or coincide with frosting temperatures.
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The effect of long‐term ozone fumigation on the growth, physiology and frost sensitivity of Calluna vulgaris
New Phytologist, 1996Co-Authors: J. P. Foot, Simon J.m. Caporn, John A. Lee, T.w. AshendenAbstract:summary Calluna vulgaris (1) Hull, plants were fumigated in open-top chambers with ambient charcoal-filtered air, or 70 nl 1−1 (70 ppb) ozone, for 8 h a day, five days a week. Ozone treatment during the winter increased the frost sensitivity of plants as measured by electrolyte leakage following a controlled frosting regime. Root growth was decreased and the allometric root-.shoot ratio (k) was reduced by the ozone treatment, reflecting a decrease in the partitioning of carbon to the roots. There was no significant effect of ozone on instantaneous net photosynthesis. There was a significant increase in anthocyanin content in ozone-fumigated plants, but no effect on chlorophyll content. In contrast with the effects of wintertime exposure, plants treated during summer showed no significant responses. These results suggest that Calluna vulgaris can be adversely affected by prolonged ozone episodes in the field, particularly if these are followed by or coincide with frosting temperatures.
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The effect of long-term ozone fumigation in the field on the growth, physiology and frost sensitivity of Calluna vulgaris [abstract]
1996Co-Authors: J. P. Foot, Simon J.m. Caporn, John A. Lee, T.w. AshendenAbstract:Calluna vulgaris (L) Hull. were fumigated in open-top chambers with ambient charcoal filtered air, or 70nl 1•1 (70 ppb)ozone, for 8h per day. 5 days a week. Ozone treatment during the winter increased the frost sensitivity of plants as measured by electrolyte leakage following a controlled frosting regime. Root grow1h was decreased and the allometric root/shoot ratio(k) was reduced by the ozone treatment. There was no significant effect or ozone upon net photosynthesis. There was a significant increase in anthocyanin content in ozone fumigated plants, but no effect on chlorophyll content.
Christiane Delage - One of the best experts on this subject based on the ideXlab platform.
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3 desoxycallunin and 2 acetylcallunin two minor 2 3 dihydroflavonoid glucosides from Calluna vulgaris
Phytochemistry, 1995Co-Authors: Daovy P. Allais, Alain Simon, Albert J. Chulia, Mourad Kaouadji, Christiane DelageAbstract:Abstract The ethyl acetate soluble fraction obtained from the acetone extract of fresh Calluna vulgaris heather flowers afforded a mixture of two minor 2,3-dihydroflavonoid glucosides. Separations were achieved by column chromatography on polyamide as well as by reversed phase MPLC and HPLC. Structural elucidations were performed by UV, 1 H and 13 C NMR. The two novel compounds which are related to the major constituent, callunin were identified as 3-desoxycallunin and 2″-acetylcallunin. This is the first report of a flavanone 8-glucoside and the second report of a dihydroflavonol 8-glucoside in the plant kingdom.
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3-Desoxycallunin and 2″-acetylcallunin, two minor 2,3-dihydroflavonoid glucosides from Calluna vulgaris
Phytochemistry, 1995Co-Authors: Daovy P. Allais, Alain Simon, Albert J. Chulia, Mourad Kaouadji, Christiane DelageAbstract:Abstract The ethyl acetate soluble fraction obtained from the acetone extract of fresh Calluna vulgaris heather flowers afforded a mixture of two minor 2,3-dihydroflavonoid glucosides. Separations were achieved by column chromatography on polyamide as well as by reversed phase MPLC and HPLC. Structural elucidations were performed by UV, 1 H and 13 C NMR. The two novel compounds which are related to the major constituent, callunin were identified as 3-desoxycallunin and 2″-acetylcallunin. This is the first report of a flavanone 8-glucoside and the second report of a dihydroflavonol 8-glucoside in the plant kingdom.
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Quercetin 3-[triacetylarabinosyl(1-->6)galactoside] and chromones from Calluna vulgaris.
Phytochemistry, 1994Co-Authors: Alain Simon, Albert J. Chulia, Mourad Kaouadji, Christiane DelageAbstract:The new quercetin 3-[2,3,4-triacetyl-alpha-L-arabinopyranosyl (1-->6)-beta-D-galactoside] has been isolated along with 5,7-dihydroxychromone and 5,7-dihydroxychromone 7-beta-D-glucoside from fresh flowers of Calluna vulgaris. Structural elucidation of these natural products was achieved mainly by 1H and 13C NMR.
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Two flavonol 3-[triacetylarabinosyl(1→6)glucosides] from Calluna vulgaris☆
Phytochemistry, 1993Co-Authors: Alain Simon, Daovy P. Allais, Albert J. Chulia, Mourad Kaouadji, Christiane DelageAbstract:Abstract Two new acylated glycosides, kaempferol 3-[2‴,3‴,4‴-triacetylarabinosyl(1→6)glucoside] and querectin 3-[2‴,3‴,5‴-triacetylarabinosyl(1→6)glucoside], have been isolated from fresh flowers of Calluna vulgaris . Structural elucidation of the natural products was achieved mainly by 1 H and 13 C NMR.
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A Calluna vulgaris extract 5-lipoxygenase inhibitor shows potent antiproliferative effects on human leukemia HL-60 cells.
Eicosanoids, 1992Co-Authors: A. Najid, Alain Simon, Christiane Delage, Albert-josé Chulia, M. RigaudAbstract:A water-Calluna vulgaris extract (water-CVE) was found to be a relatively specific arachidonate 5-lipoxygenase inhibitor and showed potent anti-proliferative effects on human leukemic HL60 cells. Water-CVE completely inhibited potato 5-lipoxygenase activity at 250 micrograms/ml, partially inhibited soybean 15-lipoxygenase at pH 7.4 and had no effect either on this 15-lipoxygenase at its optimal activity pH (pH 9) or on Lupinus albus 5-, 8-, 15-lipoxygenase. In culture, the proliferation and DNA synthesis of HL60 cells were decreased by water-CVE in a dose-dependent manner with an IC50 of 200 micrograms/ml at day 4. This effect of water-CVE is related to the starting density of HL60 cells. These results suggest that arachidonate 5-lipoxygenase metabolites and/or leukotrienes could play an essential role in cellular functions of leukemic cells and may explain the success of the use of Calluna vulgaris as tea and baths in folk medicine.
Simon J.m. Caporn - One of the best experts on this subject based on the ideXlab platform.
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Estimating Foliar Nitrogen Concentration of Heather (Calluna vulgaris) from Field and Laboratory Spectra
Water Air and Soil Pollution, 2008Co-Authors: Chariton Kalaitzidis, Simon J.m. Caporn, Mark CutlerAbstract:Regional botanical surveys supported by field experiments suggest that atmospheric nitrogen deposition threatens the balance between species and causes loss of biodiversity within plant communities. Methods are required to monitor the nitrogen status of vegetation at a landscape scale and therefore the potential for ecological change. Remote sensing has the potential to monitor a number of plant biophysical and chemical variables, but its application to monitor the nitrogen status of native vegetation remains limited and untested. Using field spectroscopy, canopy reflectance measurements were taken from two heathland field sites and heather (Calluna vulgaris) plants grown in a greenhouse. The nitrogen concentration was determined through destructive sampling and chemical analysis. Stepwise multiple regression analysis was used to identify the wavebands most associated with nitrogen concentration and despite high variation in the selected wavebands between the three datasets, most of these wavebands were associated with nitrogen and protein absorption features within the spectral region 1,990–2,170 nm. Results highlight the potential of remote sensing as a bio-monitoring technique to estimate foliar nitrogen status in native plants.
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metabolic fingerprinting for bio indication of nitrogen responses in Calluna vulgaris heath communities
Metabolomics, 2005Co-Authors: Eleanor A Gidman, Simon J.m. Caporn, Bridget A. Emmett, Royston Goodacre, Deirdre B Wilson, Jacqueline A Carroll, N Cresswell, Dylan GwynnjonesAbstract:Increased atmospheric deposition of nitrogen (N) over the last 50 years is known to have led to deleterious effects on the health of Calluna vulgaris heathland, with increased proliferation of grasses and loss of species diversity. However, currently it is difficult to attribute damage specifically to N deposition rather than other drivers of change such as inappropriate management. Metabolic fingerprinting using FT-IR offers a rapid, cost-effective and “holistic” means for quantifying foliar biochemistry responses specifically to N deposition. To test the potential of this approach we used a long term lowland heath N addition study in Chesire, England. FT-IR spectra of treated C. vulgaris shoot material showed that responses were detectable above 20 kg N ha−1 year−1. Differentiation was also evident in C. vulgaris metabolic fingerprints due to additional watering. We have shown that FT-IR is able to identify biochemical variations in C. vulgaris related to increases in received N and water. This technique therefore provides a sensitive measure of biochemical change in response to N addition, and allows development towards predictive modelling of N deposition at the landscape level.
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the effect of long term ozone fumigation on the growth physiology and frost sensitivity of Calluna vulgaris
New Phytologist, 1996Co-Authors: J. P. Foot, Simon J.m. Caporn, John A. Lee, T.w. AshendenAbstract:summary Calluna vulgaris (1) Hull, plants were fumigated in open-top chambers with ambient charcoal-filtered air, or 70 nl 1−1 (70 ppb) ozone, for 8 h a day, five days a week. Ozone treatment during the winter increased the frost sensitivity of plants as measured by electrolyte leakage following a controlled frosting regime. Root growth was decreased and the allometric root-.shoot ratio (k) was reduced by the ozone treatment, reflecting a decrease in the partitioning of carbon to the roots. There was no significant effect of ozone on instantaneous net photosynthesis. There was a significant increase in anthocyanin content in ozone-fumigated plants, but no effect on chlorophyll content. In contrast with the effects of wintertime exposure, plants treated during summer showed no significant responses. These results suggest that Calluna vulgaris can be adversely affected by prolonged ozone episodes in the field, particularly if these are followed by or coincide with frosting temperatures.
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The effect of long‐term ozone fumigation on the growth, physiology and frost sensitivity of Calluna vulgaris
New Phytologist, 1996Co-Authors: J. P. Foot, Simon J.m. Caporn, John A. Lee, T.w. AshendenAbstract:summary Calluna vulgaris (1) Hull, plants were fumigated in open-top chambers with ambient charcoal-filtered air, or 70 nl 1−1 (70 ppb) ozone, for 8 h a day, five days a week. Ozone treatment during the winter increased the frost sensitivity of plants as measured by electrolyte leakage following a controlled frosting regime. Root growth was decreased and the allometric root-.shoot ratio (k) was reduced by the ozone treatment, reflecting a decrease in the partitioning of carbon to the roots. There was no significant effect of ozone on instantaneous net photosynthesis. There was a significant increase in anthocyanin content in ozone-fumigated plants, but no effect on chlorophyll content. In contrast with the effects of wintertime exposure, plants treated during summer showed no significant responses. These results suggest that Calluna vulgaris can be adversely affected by prolonged ozone episodes in the field, particularly if these are followed by or coincide with frosting temperatures.
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The effect of long-term ozone fumigation in the field on the growth, physiology and frost sensitivity of Calluna vulgaris [abstract]
1996Co-Authors: J. P. Foot, Simon J.m. Caporn, John A. Lee, T.w. AshendenAbstract:Calluna vulgaris (L) Hull. were fumigated in open-top chambers with ambient charcoal filtered air, or 70nl 1•1 (70 ppb)ozone, for 8h per day. 5 days a week. Ozone treatment during the winter increased the frost sensitivity of plants as measured by electrolyte leakage following a controlled frosting regime. Root grow1h was decreased and the allometric root/shoot ratio(k) was reduced by the ozone treatment. There was no significant effect or ozone upon net photosynthesis. There was a significant increase in anthocyanin content in ozone fumigated plants, but no effect on chlorophyll content.
J. P. Foot - One of the best experts on this subject based on the ideXlab platform.
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the effect of long term ozone fumigation on the growth physiology and frost sensitivity of Calluna vulgaris
New Phytologist, 1996Co-Authors: J. P. Foot, Simon J.m. Caporn, John A. Lee, T.w. AshendenAbstract:summary Calluna vulgaris (1) Hull, plants were fumigated in open-top chambers with ambient charcoal-filtered air, or 70 nl 1−1 (70 ppb) ozone, for 8 h a day, five days a week. Ozone treatment during the winter increased the frost sensitivity of plants as measured by electrolyte leakage following a controlled frosting regime. Root growth was decreased and the allometric root-.shoot ratio (k) was reduced by the ozone treatment, reflecting a decrease in the partitioning of carbon to the roots. There was no significant effect of ozone on instantaneous net photosynthesis. There was a significant increase in anthocyanin content in ozone-fumigated plants, but no effect on chlorophyll content. In contrast with the effects of wintertime exposure, plants treated during summer showed no significant responses. These results suggest that Calluna vulgaris can be adversely affected by prolonged ozone episodes in the field, particularly if these are followed by or coincide with frosting temperatures.
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The effect of long‐term ozone fumigation on the growth, physiology and frost sensitivity of Calluna vulgaris
New Phytologist, 1996Co-Authors: J. P. Foot, Simon J.m. Caporn, John A. Lee, T.w. AshendenAbstract:summary Calluna vulgaris (1) Hull, plants were fumigated in open-top chambers with ambient charcoal-filtered air, or 70 nl 1−1 (70 ppb) ozone, for 8 h a day, five days a week. Ozone treatment during the winter increased the frost sensitivity of plants as measured by electrolyte leakage following a controlled frosting regime. Root growth was decreased and the allometric root-.shoot ratio (k) was reduced by the ozone treatment, reflecting a decrease in the partitioning of carbon to the roots. There was no significant effect of ozone on instantaneous net photosynthesis. There was a significant increase in anthocyanin content in ozone-fumigated plants, but no effect on chlorophyll content. In contrast with the effects of wintertime exposure, plants treated during summer showed no significant responses. These results suggest that Calluna vulgaris can be adversely affected by prolonged ozone episodes in the field, particularly if these are followed by or coincide with frosting temperatures.
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The effect of long-term ozone fumigation in the field on the growth, physiology and frost sensitivity of Calluna vulgaris [abstract]
1996Co-Authors: J. P. Foot, Simon J.m. Caporn, John A. Lee, T.w. AshendenAbstract:Calluna vulgaris (L) Hull. were fumigated in open-top chambers with ambient charcoal filtered air, or 70nl 1•1 (70 ppb)ozone, for 8h per day. 5 days a week. Ozone treatment during the winter increased the frost sensitivity of plants as measured by electrolyte leakage following a controlled frosting regime. Root grow1h was decreased and the allometric root/shoot ratio(k) was reduced by the ozone treatment. There was no significant effect or ozone upon net photosynthesis. There was a significant increase in anthocyanin content in ozone fumigated plants, but no effect on chlorophyll content.
Alain Simon - One of the best experts on this subject based on the ideXlab platform.
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3 desoxycallunin and 2 acetylcallunin two minor 2 3 dihydroflavonoid glucosides from Calluna vulgaris
Phytochemistry, 1995Co-Authors: Daovy P. Allais, Alain Simon, Albert J. Chulia, Mourad Kaouadji, Christiane DelageAbstract:Abstract The ethyl acetate soluble fraction obtained from the acetone extract of fresh Calluna vulgaris heather flowers afforded a mixture of two minor 2,3-dihydroflavonoid glucosides. Separations were achieved by column chromatography on polyamide as well as by reversed phase MPLC and HPLC. Structural elucidations were performed by UV, 1 H and 13 C NMR. The two novel compounds which are related to the major constituent, callunin were identified as 3-desoxycallunin and 2″-acetylcallunin. This is the first report of a flavanone 8-glucoside and the second report of a dihydroflavonol 8-glucoside in the plant kingdom.
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3-Desoxycallunin and 2″-acetylcallunin, two minor 2,3-dihydroflavonoid glucosides from Calluna vulgaris
Phytochemistry, 1995Co-Authors: Daovy P. Allais, Alain Simon, Albert J. Chulia, Mourad Kaouadji, Christiane DelageAbstract:Abstract The ethyl acetate soluble fraction obtained from the acetone extract of fresh Calluna vulgaris heather flowers afforded a mixture of two minor 2,3-dihydroflavonoid glucosides. Separations were achieved by column chromatography on polyamide as well as by reversed phase MPLC and HPLC. Structural elucidations were performed by UV, 1 H and 13 C NMR. The two novel compounds which are related to the major constituent, callunin were identified as 3-desoxycallunin and 2″-acetylcallunin. This is the first report of a flavanone 8-glucoside and the second report of a dihydroflavonol 8-glucoside in the plant kingdom.
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Quercetin 3-[triacetylarabinosyl(1-->6)galactoside] and chromones from Calluna vulgaris.
Phytochemistry, 1994Co-Authors: Alain Simon, Albert J. Chulia, Mourad Kaouadji, Christiane DelageAbstract:The new quercetin 3-[2,3,4-triacetyl-alpha-L-arabinopyranosyl (1-->6)-beta-D-galactoside] has been isolated along with 5,7-dihydroxychromone and 5,7-dihydroxychromone 7-beta-D-glucoside from fresh flowers of Calluna vulgaris. Structural elucidation of these natural products was achieved mainly by 1H and 13C NMR.
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Two flavonol 3-[triacetylarabinosyl(1→6)glucosides] from Calluna vulgaris☆
Phytochemistry, 1993Co-Authors: Alain Simon, Daovy P. Allais, Albert J. Chulia, Mourad Kaouadji, Christiane DelageAbstract:Abstract Two new acylated glycosides, kaempferol 3-[2‴,3‴,4‴-triacetylarabinosyl(1→6)glucoside] and querectin 3-[2‴,3‴,5‴-triacetylarabinosyl(1→6)glucoside], have been isolated from fresh flowers of Calluna vulgaris . Structural elucidation of the natural products was achieved mainly by 1 H and 13 C NMR.
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A Calluna vulgaris extract 5-lipoxygenase inhibitor shows potent antiproliferative effects on human leukemia HL-60 cells.
Eicosanoids, 1992Co-Authors: A. Najid, Alain Simon, Christiane Delage, Albert-josé Chulia, M. RigaudAbstract:A water-Calluna vulgaris extract (water-CVE) was found to be a relatively specific arachidonate 5-lipoxygenase inhibitor and showed potent anti-proliferative effects on human leukemic HL60 cells. Water-CVE completely inhibited potato 5-lipoxygenase activity at 250 micrograms/ml, partially inhibited soybean 15-lipoxygenase at pH 7.4 and had no effect either on this 15-lipoxygenase at its optimal activity pH (pH 9) or on Lupinus albus 5-, 8-, 15-lipoxygenase. In culture, the proliferation and DNA synthesis of HL60 cells were decreased by water-CVE in a dose-dependent manner with an IC50 of 200 micrograms/ml at day 4. This effect of water-CVE is related to the starting density of HL60 cells. These results suggest that arachidonate 5-lipoxygenase metabolites and/or leukotrienes could play an essential role in cellular functions of leukemic cells and may explain the success of the use of Calluna vulgaris as tea and baths in folk medicine.
