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Z Jamzad - One of the best experts on this subject based on the ideXlab platform.

  • leaf surface flavonoids in iranian species of Nepeta lamiaceae and some related genera
    Biochemical Systematics and Ecology, 2003
    Co-Authors: Z Jamzad, Monique S J Simmonds, Martin J Ingrouille, Renee J Grayer, Geoffrey C Kite, A Jalili
    Abstract:

    Abstract A HPLC survey of the leaf surface flavonoids of 38 species of Nepeta (Lamiaceae) and four species of the related genera Agastache, Dracocephalum and Lallemantia revealed 14 different flavones, one of which is new (8-hydroxycirsiliol or 5,8,3′,4′-tetrahydroxy-6,7-dimethoxyflavone). In addition, two flavonols (methyl ethers of kaempferol) were found in Dracocephalum kotschyii. The most frequently encountered flavones in Nepeta were cirsimaritin (5,4′-dihydroxy-6,7-dimethoxyflavone); 8-hydroxycirsimaritin (5,8,4′-trihydroxy-6,7-dimethoxyflavone, also called isothymusin) and genkwanin (5,4′-dihydroxy-7-methoxyflavone). Apigenin and the 4′-methyl ethers of cirsimaritin and 8-hydroxycirsimaritin (salvigenin and 8-hydroxysalvigenin, respectively) were also relatively common. The distribution of surface flavones in the four genera provided some valuable data for the phylogenetic relationships at generic level. The presence of surface flavones with a 5-hydroxy-6,7-dimethoxy A-ring (as found in cirsimaritin and salvigenin) and the unusual 5,8-dihydroxy-6,7-dimethoxy A-ring substitution pattern (as found in 8-hydroxycirsimaritin, 8-hydroxysalvigenin and 8-hydroxycirsiliol), can be considered as a characteristic chemotaxonomic feature typical of the genus Nepeta. Cirsimaritin and 8-hydroxycirsimaritin were also detected in the one species examined for Agastache, but the absence of genkwanin and the presence of acacetin in A. barberi and in ten Agastache species studied previously, distinguished Agastache from Nepeta. The presence of methoxylated flavonols and absence of 8-hydroxycirsimaritin and related compounds distinguished species of Dracocephalum and Nepeta, whereas lack of flavonoids with 6- and 8-oxygenation of the A-ring characterised species of the genus Lallemantia.

  • three new species of Nepeta lamiaceae from iran
    Taxon, 2003
    Co-Authors: Z Jamzad, Martin Ingronille, Monique S J Simmonds
    Abstract:

    The Iranian species of Nepela were investigated as part of a phylogenetic study of the genus. The relationships among species revealed the status of some taxa including three new species. The new species are recognized bydifferences in morphology as well as molecular characters. Nepeta balouchestanica, N. mahanensis, and N. hormozganica are described as new and their relationships with closely related taxa discussed.

  • phylogenetic relationships in Nepeta l lamiaceae and related genera based on its sequence data
    Taxon, 2003
    Co-Authors: Z Jamzad, Monique S J Simmonds, Mark W Chase, Martin J Ingrouille, A Jalili
    Abstract:

    The internal transcribed spacers of nuclear ribosomal DNA (nrlTS) from 43 species of Nepeta and representatives of closely related genera (Lallemantia, Dracocephalum and Agastache) and outgroups (Lavandula, Stachys, Newcustelia and Prostanthera) were sequenced. Parsimony analysis indicated that Nepeta is monophyletic and composed of five major monophyletic groups, most of which comprise species belonging to more than one section in previous classifications. These five Glades are composed of: (1) sect. SpartoNepeta; (2) sects. MacroNepeta + Spicatae; (3) sects. Nepeta + Micranthae p-p. + OxyNepeta + Schizocalyx + Macrostegiae; (4) sects. Capituliferae + Denudatae + Micranthae p.p. + MicroNepeta p.p.; and (5) sect. PsiloNepeta. The phylogenetic relationships among species of these groups are congruent with the distribution of some floral characters, including corolla shape, bract texture, color and pollen exine ornamentation.

Rosario M Martins - One of the best experts on this subject based on the ideXlab platform.

Silvia Arantes - One of the best experts on this subject based on the ideXlab platform.

A Jalili - One of the best experts on this subject based on the ideXlab platform.

  • leaf surface flavonoids in iranian species of Nepeta lamiaceae and some related genera
    Biochemical Systematics and Ecology, 2003
    Co-Authors: Z Jamzad, Monique S J Simmonds, Martin J Ingrouille, Renee J Grayer, Geoffrey C Kite, A Jalili
    Abstract:

    Abstract A HPLC survey of the leaf surface flavonoids of 38 species of Nepeta (Lamiaceae) and four species of the related genera Agastache, Dracocephalum and Lallemantia revealed 14 different flavones, one of which is new (8-hydroxycirsiliol or 5,8,3′,4′-tetrahydroxy-6,7-dimethoxyflavone). In addition, two flavonols (methyl ethers of kaempferol) were found in Dracocephalum kotschyii. The most frequently encountered flavones in Nepeta were cirsimaritin (5,4′-dihydroxy-6,7-dimethoxyflavone); 8-hydroxycirsimaritin (5,8,4′-trihydroxy-6,7-dimethoxyflavone, also called isothymusin) and genkwanin (5,4′-dihydroxy-7-methoxyflavone). Apigenin and the 4′-methyl ethers of cirsimaritin and 8-hydroxycirsimaritin (salvigenin and 8-hydroxysalvigenin, respectively) were also relatively common. The distribution of surface flavones in the four genera provided some valuable data for the phylogenetic relationships at generic level. The presence of surface flavones with a 5-hydroxy-6,7-dimethoxy A-ring (as found in cirsimaritin and salvigenin) and the unusual 5,8-dihydroxy-6,7-dimethoxy A-ring substitution pattern (as found in 8-hydroxycirsimaritin, 8-hydroxysalvigenin and 8-hydroxycirsiliol), can be considered as a characteristic chemotaxonomic feature typical of the genus Nepeta. Cirsimaritin and 8-hydroxycirsimaritin were also detected in the one species examined for Agastache, but the absence of genkwanin and the presence of acacetin in A. barberi and in ten Agastache species studied previously, distinguished Agastache from Nepeta. The presence of methoxylated flavonols and absence of 8-hydroxycirsimaritin and related compounds distinguished species of Dracocephalum and Nepeta, whereas lack of flavonoids with 6- and 8-oxygenation of the A-ring characterised species of the genus Lallemantia.

  • phylogenetic relationships in Nepeta l lamiaceae and related genera based on its sequence data
    Taxon, 2003
    Co-Authors: Z Jamzad, Monique S J Simmonds, Mark W Chase, Martin J Ingrouille, A Jalili
    Abstract:

    The internal transcribed spacers of nuclear ribosomal DNA (nrlTS) from 43 species of Nepeta and representatives of closely related genera (Lallemantia, Dracocephalum and Agastache) and outgroups (Lavandula, Stachys, Newcustelia and Prostanthera) were sequenced. Parsimony analysis indicated that Nepeta is monophyletic and composed of five major monophyletic groups, most of which comprise species belonging to more than one section in previous classifications. These five Glades are composed of: (1) sect. SpartoNepeta; (2) sects. MacroNepeta + Spicatae; (3) sects. Nepeta + Micranthae p-p. + OxyNepeta + Schizocalyx + Macrostegiae; (4) sects. Capituliferae + Denudatae + Micranthae p.p. + MicroNepeta p.p.; and (5) sect. PsiloNepeta. The phylogenetic relationships among species of these groups are congruent with the distribution of some floral characters, including corolla shape, bract texture, color and pollen exine ornamentation.

Thomas Efferth - One of the best experts on this subject based on the ideXlab platform.

  • pharmacological and chemical features of Nepeta l genus its importance as a therapeutic agent
    Phytotherapy Research, 2018
    Co-Authors: Ipek Suntar, Seyed Mohammad Nabavi, Davide Barreca, Nicolas Fischer, Thomas Efferth
    Abstract:

    Medicinal plants have always had great value for the human population due to their valuable constituents and potential bioactivities. The objective of this review is to present an updated overview of an important medicinal plant genus Nepeta L., from the family Lamiaceae, revealing its traditional utilization, biological activity, phytoconstituents, and mechanisms of action. For this purpose, a literature survey was carried out by using SciFinder, ScienceDirect, Scopus, PubMed, and Web of Science followed by a revision of the bibliographies of the related articles. We have described and analyzed the role of plants in drug discovery and the importance of Nepeta species. Information on the utilization purposes of Nepeta species in folk medicine has been emphasized, and scientific studies on the biological effects and secondary metabolites are addressed. Nepeta species are characterized by terpenoid-type compounds and phenolic constituents, which exert several activities such as an antimicrobial, repellent against major pathogen vector mosquitoes, insecticide, larvicide against Anopheles stephensi, cytotoxic anticarcinogen, antioxidant, anticonvulsant, analgesic, anti-inflammatory agent, and antidepressant, revealing its importance in medicinal and agricultural fields. On the basis of numerous studies, the Nepeta genus demonstrates remarkable therapeutic effects against various diseases. However, clinical studies are warranted to confirm preclinical findings.