The Experts below are selected from a list of 31017 Experts worldwide ranked by ideXlab platform
Bao Xiang - One of the best experts on this subject based on the ideXlab platform.
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photosynthesis and biochemical responses to elevated o3 in Plantago major and sonchus oleraceus growing in a lowland habitat of northern china
Journal of Environmental Sciences-china, 2017Co-Authors: Benying Su, Xiujie Zhang, Hua Su, Yonggeng Li, Meihua Zhou, Hong Xu, Bao XiangAbstract:Abstract A field experiment was carried out to compare the responses to ozone (O 3 ) in two common Herbaceous Plant species, Plantago major L. and Sonchus oleraceus L., by building open-top growth chambers in situ to simulate O 3 stress (+ O 3 , 85 ± 5 ppb, 9 hr/day for 30 days) in a lowland habitat in Inner Mongolia, Northern China. Responses to O 3 of gas exchange, chlorophyll a fluorescence, leaf pigment content, antioxidant capability, soluble protein content, membrane lipid peroxidation and dark respiration ( R d ) were analyzed. Results showed that elevated O 3 exposure significantly reduced the light-saturated net photosynthesis ( P Nsat ), stomatal conductance ( g s ) and transpiration rate ( E ) in both species. Although non-significant interactive effect between species and O 3 on P Nsat was analyzed, the reduction in P Nsat in S. oleraceus might be due primarily to the higher fraction of close PSII reaction centers and impaired activities of Plant mesophyll cells as evidences by decreased maximum efficiency of PSII photochemistry after dark adapted state ( F v / F m ) and unchanged intercellular CO 2 concentration ( C i ). Besides, biochemical analysis showed that S. oleraceus had lower antioxidant ability compared to P. major . As a result, S. oleraceus was damaged to the larger extent in terms of lipid peroxidation and visible O 3 injury, indicating that S. oleraceus was more sensitive to O 3 than P. major . Our results indicated that wild Herbaceous Plant species growing in a lowland habitat in sandy grassland were sensitive to O 3 stress and S. oleraceus can be considered as one of the bio-indicators for high O 3 concentration in semi-arid grassland of northern China.
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photosynthesis and biochemical responses to elevated o 3 in Plantago major and sonchus oleraceus growing in a lowland habitat of northern china
Journal of Environmental Sciences-china, 2017Co-Authors: Meihua Zhou, Xiujie Zhang, Bao XiangAbstract:Abstract A field experiment was carried out to compare the responses to ozone (O 3 ) in two common Herbaceous Plant species, Plantago major L. and Sonchus oleraceus L., by building open-top growth chambers in situ to simulate O 3 stress (+ O 3 , 85 ± 5 ppb, 9 hr/day for 30 days) in a lowland habitat in Inner Mongolia, Northern China. Responses to O 3 of gas exchange, chlorophyll a fluorescence, leaf pigment content, antioxidant capability, soluble protein content, membrane lipid peroxidation and dark respiration ( R d ) were analyzed. Results showed that elevated O 3 exposure significantly reduced the light-saturated net photosynthesis ( P Nsat ), stomatal conductance ( g s ) and transpiration rate ( E ) in both species. Although non-significant interactive effect between species and O 3 on P Nsat was analyzed, the reduction in P Nsat in S. oleraceus might be due primarily to the higher fraction of close PSII reaction centers and impaired activities of Plant mesophyll cells as evidences by decreased maximum efficiency of PSII photochemistry after dark adapted state ( F v / F m ) and unchanged intercellular CO 2 concentration ( C i ). Besides, biochemical analysis showed that S. oleraceus had lower antioxidant ability compared to P. major . As a result, S. oleraceus was damaged to the larger extent in terms of lipid peroxidation and visible O 3 injury, indicating that S. oleraceus was more sensitive to O 3 than P. major . Our results indicated that wild Herbaceous Plant species growing in a lowland habitat in sandy grassland were sensitive to O 3 stress and S. oleraceus can be considered as one of the bio-indicators for high O 3 concentration in semi-arid grassland of northern China.
Meihua Zhou - One of the best experts on this subject based on the ideXlab platform.
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photosynthesis and biochemical responses to elevated o3 in Plantago major and sonchus oleraceus growing in a lowland habitat of northern china
Journal of Environmental Sciences-china, 2017Co-Authors: Benying Su, Xiujie Zhang, Hua Su, Yonggeng Li, Meihua Zhou, Hong Xu, Bao XiangAbstract:Abstract A field experiment was carried out to compare the responses to ozone (O 3 ) in two common Herbaceous Plant species, Plantago major L. and Sonchus oleraceus L., by building open-top growth chambers in situ to simulate O 3 stress (+ O 3 , 85 ± 5 ppb, 9 hr/day for 30 days) in a lowland habitat in Inner Mongolia, Northern China. Responses to O 3 of gas exchange, chlorophyll a fluorescence, leaf pigment content, antioxidant capability, soluble protein content, membrane lipid peroxidation and dark respiration ( R d ) were analyzed. Results showed that elevated O 3 exposure significantly reduced the light-saturated net photosynthesis ( P Nsat ), stomatal conductance ( g s ) and transpiration rate ( E ) in both species. Although non-significant interactive effect between species and O 3 on P Nsat was analyzed, the reduction in P Nsat in S. oleraceus might be due primarily to the higher fraction of close PSII reaction centers and impaired activities of Plant mesophyll cells as evidences by decreased maximum efficiency of PSII photochemistry after dark adapted state ( F v / F m ) and unchanged intercellular CO 2 concentration ( C i ). Besides, biochemical analysis showed that S. oleraceus had lower antioxidant ability compared to P. major . As a result, S. oleraceus was damaged to the larger extent in terms of lipid peroxidation and visible O 3 injury, indicating that S. oleraceus was more sensitive to O 3 than P. major . Our results indicated that wild Herbaceous Plant species growing in a lowland habitat in sandy grassland were sensitive to O 3 stress and S. oleraceus can be considered as one of the bio-indicators for high O 3 concentration in semi-arid grassland of northern China.
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photosynthesis and biochemical responses to elevated o 3 in Plantago major and sonchus oleraceus growing in a lowland habitat of northern china
Journal of Environmental Sciences-china, 2017Co-Authors: Meihua Zhou, Xiujie Zhang, Bao XiangAbstract:Abstract A field experiment was carried out to compare the responses to ozone (O 3 ) in two common Herbaceous Plant species, Plantago major L. and Sonchus oleraceus L., by building open-top growth chambers in situ to simulate O 3 stress (+ O 3 , 85 ± 5 ppb, 9 hr/day for 30 days) in a lowland habitat in Inner Mongolia, Northern China. Responses to O 3 of gas exchange, chlorophyll a fluorescence, leaf pigment content, antioxidant capability, soluble protein content, membrane lipid peroxidation and dark respiration ( R d ) were analyzed. Results showed that elevated O 3 exposure significantly reduced the light-saturated net photosynthesis ( P Nsat ), stomatal conductance ( g s ) and transpiration rate ( E ) in both species. Although non-significant interactive effect between species and O 3 on P Nsat was analyzed, the reduction in P Nsat in S. oleraceus might be due primarily to the higher fraction of close PSII reaction centers and impaired activities of Plant mesophyll cells as evidences by decreased maximum efficiency of PSII photochemistry after dark adapted state ( F v / F m ) and unchanged intercellular CO 2 concentration ( C i ). Besides, biochemical analysis showed that S. oleraceus had lower antioxidant ability compared to P. major . As a result, S. oleraceus was damaged to the larger extent in terms of lipid peroxidation and visible O 3 injury, indicating that S. oleraceus was more sensitive to O 3 than P. major . Our results indicated that wild Herbaceous Plant species growing in a lowland habitat in sandy grassland were sensitive to O 3 stress and S. oleraceus can be considered as one of the bio-indicators for high O 3 concentration in semi-arid grassland of northern China.
Xiujie Zhang - One of the best experts on this subject based on the ideXlab platform.
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photosynthesis and biochemical responses to elevated o3 in Plantago major and sonchus oleraceus growing in a lowland habitat of northern china
Journal of Environmental Sciences-china, 2017Co-Authors: Benying Su, Xiujie Zhang, Hua Su, Yonggeng Li, Meihua Zhou, Hong Xu, Bao XiangAbstract:Abstract A field experiment was carried out to compare the responses to ozone (O 3 ) in two common Herbaceous Plant species, Plantago major L. and Sonchus oleraceus L., by building open-top growth chambers in situ to simulate O 3 stress (+ O 3 , 85 ± 5 ppb, 9 hr/day for 30 days) in a lowland habitat in Inner Mongolia, Northern China. Responses to O 3 of gas exchange, chlorophyll a fluorescence, leaf pigment content, antioxidant capability, soluble protein content, membrane lipid peroxidation and dark respiration ( R d ) were analyzed. Results showed that elevated O 3 exposure significantly reduced the light-saturated net photosynthesis ( P Nsat ), stomatal conductance ( g s ) and transpiration rate ( E ) in both species. Although non-significant interactive effect between species and O 3 on P Nsat was analyzed, the reduction in P Nsat in S. oleraceus might be due primarily to the higher fraction of close PSII reaction centers and impaired activities of Plant mesophyll cells as evidences by decreased maximum efficiency of PSII photochemistry after dark adapted state ( F v / F m ) and unchanged intercellular CO 2 concentration ( C i ). Besides, biochemical analysis showed that S. oleraceus had lower antioxidant ability compared to P. major . As a result, S. oleraceus was damaged to the larger extent in terms of lipid peroxidation and visible O 3 injury, indicating that S. oleraceus was more sensitive to O 3 than P. major . Our results indicated that wild Herbaceous Plant species growing in a lowland habitat in sandy grassland were sensitive to O 3 stress and S. oleraceus can be considered as one of the bio-indicators for high O 3 concentration in semi-arid grassland of northern China.
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photosynthesis and biochemical responses to elevated o 3 in Plantago major and sonchus oleraceus growing in a lowland habitat of northern china
Journal of Environmental Sciences-china, 2017Co-Authors: Meihua Zhou, Xiujie Zhang, Bao XiangAbstract:Abstract A field experiment was carried out to compare the responses to ozone (O 3 ) in two common Herbaceous Plant species, Plantago major L. and Sonchus oleraceus L., by building open-top growth chambers in situ to simulate O 3 stress (+ O 3 , 85 ± 5 ppb, 9 hr/day for 30 days) in a lowland habitat in Inner Mongolia, Northern China. Responses to O 3 of gas exchange, chlorophyll a fluorescence, leaf pigment content, antioxidant capability, soluble protein content, membrane lipid peroxidation and dark respiration ( R d ) were analyzed. Results showed that elevated O 3 exposure significantly reduced the light-saturated net photosynthesis ( P Nsat ), stomatal conductance ( g s ) and transpiration rate ( E ) in both species. Although non-significant interactive effect between species and O 3 on P Nsat was analyzed, the reduction in P Nsat in S. oleraceus might be due primarily to the higher fraction of close PSII reaction centers and impaired activities of Plant mesophyll cells as evidences by decreased maximum efficiency of PSII photochemistry after dark adapted state ( F v / F m ) and unchanged intercellular CO 2 concentration ( C i ). Besides, biochemical analysis showed that S. oleraceus had lower antioxidant ability compared to P. major . As a result, S. oleraceus was damaged to the larger extent in terms of lipid peroxidation and visible O 3 injury, indicating that S. oleraceus was more sensitive to O 3 than P. major . Our results indicated that wild Herbaceous Plant species growing in a lowland habitat in sandy grassland were sensitive to O 3 stress and S. oleraceus can be considered as one of the bio-indicators for high O 3 concentration in semi-arid grassland of northern China.
Pietro Monaco - One of the best experts on this subject based on the ideXlab platform.
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petrorhagiosides a d new γ pyrone derivatives from petrorhagia saxifraga link
Helvetica Chimica Acta, 2013Co-Authors: Brigida Dabrosca, Severina Pacifico, Monica Scognamiglio, Nikolaos Tsafantakis, Pietro Monaco, Emanuela Pagliari, Antonio FiorentinoAbstract:Four novel γ-pyrone (=4H-pyran-4-one) metabolites, petrorhagiosides A–D, along with four known analogs, have been isolated from the MeOH extract of Petrorhagia saxifraga, a perennial Herbaceous Plant typical of Mediterranean vegetation. The structures of the new compounds were established on the basis of extensive spectroscopic analyses including 1D- an 2D-NMR (1H,1H-DQ-COSY, TOCSY, HSQC, CIGAR-HMBC, and HSQC-TOCSY) experiments.
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potential allelopathic interference of melilotus neapolitana metabolites on three coexisting species of mediterranean Herbaceous Plant community
Journal of Plant Interactions, 2008Co-Authors: Assunta Esposito, Brigida Dabrosca, Antonio Fiorentino, Angelina Izzo, Giuseppe Cefarelli, Annunziata Golino, Pietro MonacoAbstract:Abstract This study is focused on the allelopathic interference of Melilotus neapolitana, an annual stenomediterranean species frequently occurring in the Herbaceous Plant community of the Mediterranean macchia, on three coexisting species of the Mediterranean Herbaceous Plant community. The ethereal and methanol extracts of the Plant led to the isolation of 11 allelochemicals: coumarin, cis- and trans-melilotoside, the dihydromelilotoside, seven flavone glycosides, as well as the inactive β-sitosterol, a C13-norterpene glucoside and a polyphenol. All the structures have been elucidated on the basis of their spectroscopic features. The organic extracts and all the pure compounds have been assayed for their allelopathic activity on three coexisting species, Petrorhagia velutina, Dactylis hispanica, and Phleum subulatum. The cluster analysis has shown a clear structure-activity relationship, by evidencing four main groups of compounds with a specific effect patterns. Coumarin, the most abundant compound bot...
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carexanes from carex distachya desf revised stereochemistry and characterization of four novel polyhydroxylated prenylstilbenes
Tetrahedron, 2008Co-Authors: Antonio Fiorentino, Severina Pacifico, Brigida Dabrosca, Angelina Izzo, Piera Uzzo, Rosa Iacovino, Agostino Russo, Benedetto Di Blasio, Pietro MonacoAbstract:Abstract Carexanes are unusual secondary metabolites isolated from the Herbaceous Plant Carex distachya . Four new carexanes have been isolated and characterized from the methanolic leaf extract of the Plant. All of the structures have been elucidated on the basis of spectroscopic data. The stereochemistry of all the carexane metabolites isolated from the Plant, as well as their 1 H and 13 C NMR spectroscopic assignment, has been revised on the basis of X-ray analysis of carexane D, chemical correlations, and NOESY/ROESY experiments. All the data suggested a cis junction between B and C rings.
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natural dibenzoxazepinones from leaves of carex distachya structural elucidation and radical scavenging activity
ChemInform, 2007Co-Authors: Antonio Fiorentino, Severina Pacifico, Brigida Dabrosca, Giuseppe Cefarelli, Piera Uzzo, Pietro MonacoAbstract:Two new dibenzoxazepinones have been isolated from the leaves of Carex distachya, an Herbaceous Plant growing in the Mediterranean area. The structures have been elucidated on the basis of their spectroscopic properties. Bidimensional NMR (DQ-COSY, TOCSY, NOESY, ROESY, HSQC, and HMBC) furnished important data useful for the characterization of the molecules. The compounds have been assayed, for the antioxidant activity, by measuring its capacity to scavenge the DPPH, the superoxide anion, and nitric oxide radicals.
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structural elucidation and bioactivity of novel secondary metabolites from carex distachya
Tetrahedron, 2006Co-Authors: Antonio Fiorentino, Severina Pacifico, Brigida Dabrosca, Angelina Izzo, Pietro MonacoAbstract:Abstract Four new carexanes and a new seco-derivative metabolite have been isolated and characterized from the Herbaceous Plant Carex distachya Desf. All of the structures have been elucidated on the basis of spectroscopic data. These compounds derive from the cyclization of prenylate stylbenoid precursors. The seco-carexane is formed by a further oxidative cleavage of the C-7–C-8 bond. The absolute configurations have been determined by Mosher's method using appropriate chemical correlations. All of the carexanes A–H have been tested for their phytotoxicity against Lactuca sativa. The bioassays showed an inhibitory effect on seed germination for all compounds described in this report.
Benying Su - One of the best experts on this subject based on the ideXlab platform.
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photosynthesis and biochemical responses to elevated o3 in Plantago major and sonchus oleraceus growing in a lowland habitat of northern china
Journal of Environmental Sciences-china, 2017Co-Authors: Benying Su, Xiujie Zhang, Hua Su, Yonggeng Li, Meihua Zhou, Hong Xu, Bao XiangAbstract:Abstract A field experiment was carried out to compare the responses to ozone (O 3 ) in two common Herbaceous Plant species, Plantago major L. and Sonchus oleraceus L., by building open-top growth chambers in situ to simulate O 3 stress (+ O 3 , 85 ± 5 ppb, 9 hr/day for 30 days) in a lowland habitat in Inner Mongolia, Northern China. Responses to O 3 of gas exchange, chlorophyll a fluorescence, leaf pigment content, antioxidant capability, soluble protein content, membrane lipid peroxidation and dark respiration ( R d ) were analyzed. Results showed that elevated O 3 exposure significantly reduced the light-saturated net photosynthesis ( P Nsat ), stomatal conductance ( g s ) and transpiration rate ( E ) in both species. Although non-significant interactive effect between species and O 3 on P Nsat was analyzed, the reduction in P Nsat in S. oleraceus might be due primarily to the higher fraction of close PSII reaction centers and impaired activities of Plant mesophyll cells as evidences by decreased maximum efficiency of PSII photochemistry after dark adapted state ( F v / F m ) and unchanged intercellular CO 2 concentration ( C i ). Besides, biochemical analysis showed that S. oleraceus had lower antioxidant ability compared to P. major . As a result, S. oleraceus was damaged to the larger extent in terms of lipid peroxidation and visible O 3 injury, indicating that S. oleraceus was more sensitive to O 3 than P. major . Our results indicated that wild Herbaceous Plant species growing in a lowland habitat in sandy grassland were sensitive to O 3 stress and S. oleraceus can be considered as one of the bio-indicators for high O 3 concentration in semi-arid grassland of northern China.