Topic
Hypericum maculatum
About: Hypericum maculatum is a research topic. Over the lifetime, 39 publications have been published within this topic receiving 818 citations.
Papers
TL;DR: Of the two elicitors, SA was more effective in stimulating the accumulation of hypericins and pseudohypericin in shoot cultures of Hypericum hirsutum and H. maculatum, and it is suggested that culture of shoots on MS medium supplemented with BA or Kin enhanced production ofhypericins in H. Maculatum and hyperforin inH.
Abstract: We investigated the effects of plant growth regulators [6-benzyladenine (BA), kinetin (Kin), 6-γ,γ-dimethylallylaminopurine (2iP), thidiazuron (TDZ) and α-naphthaleneacetic acid (NAA)], modified Murashige and Skoog (MS) medium containing 10 mM NH4
+ and 5 mM NO3
− and supplemented with 2iP, BA, Kin and NAA (MSM medium), and two elicitors [jasmonic acid (JA), and salicylic acid (SA)], on plant growth and accumulation of hypericins (hypericin and pseudohypericin) and hyperforin in shoot cultures of Hypericum hirsutum and H. maculatum. Our data suggested that culture of shoots on MS medium supplemented with BA (0.4 mg l−1) or Kin (0.4 mg l−1) enhanced production of hypericins in H. maculatum and hyperforin in H. hirsutum. Hypericins and hyperforin concentrations decreased in both species when TDZ (0.4 mg l−1) was added to the MS medium. Also, TDZ induced hyperhydric malformations and necrosis of regenerated shoots. Cultivation of H. maculatum on MSM medium resulted in approximately twofold increased production of hypericins compared to controls, and the growth of H. hirsutum shoots on the same medium led to a 6.16-fold increase in hyperforin production. Of the two elicitors, SA was more effective in stimulating the accumulation of hypericins. At 50 μM, SA enhanced the production of hypericin (7.98-fold) and pseudohypericin (13.58-fold) in H. hirsutum, and, at 200 μM, enhanced the production of hypericin (2.2-fold) and pseudohypericin (3.94-fold) in H. maculatum.
230 citations
TL;DR: In this paper, the volatile composition of six Hypericum species has been studied by steam distillation in 500mL H 2 O for 2h in a modified Clevenger apparatus with a water-cooled oil receiver to reduce hydrodistillation over-heating artifacts, and their analyses were performed by GC and GC-MS.
99 citations
TL;DR: The main conclusion from the above data is that genetic and environmental factors both play a role in determining the composition of essential oils of the Hypericum species studied.
78 citations
TL;DR: Sequential chemical extractions reveal that variations in Cd distribution between the bulk soil and the corresponding rhizospheric soil occur mainly in the Cd-bearing phases, which are exchangeable, bound to carbonates, and associated with organic matter.
Abstract: The uptake of cadmium (Cd) was analyzed for six different perennial plant species growing in a wooded pasture of the Swiss Jura Mountains, where the soils are geogenically enriched in Cd (4.58 mg.kg(-1) on average (n = 36); maximal value: 16.3 mg.kg(-1)). The six selected plants - Hypericum maculatum (Hypericaceae), Alchemilla xanthochlora (Rosaceae), Cynosurus cristatus (Poaceae), Ranunculus acris (Ranunculaceae), Dactylis glomerata (Poaceae) and Acer pseudoplatanus (Sapindaceae) - show variable Cd contents among the species and among individuals from the same family (Poaceae). Average Cd concentrations in the selected plants are in the 2-6 mg.kg(-1) range and exceed the maximal Cd concentration tolerated in vegetal feed for animals, which is established at 1 mg.kg(-1). High Cd concentrations in the soil result in a reduction of Cd accumulation in the shoots and a corresponding increase in the roots. This implies that Cd transfer coefficients from the soil/rhizosphere to the plant are inversely proportional to the total Cd concentrations in soils and do not depend on plant species but instead on soil type. Sequential chemical extractions reveal that variations in Cd distribution between the bulk soil and the corresponding rhizospheric soil occur mainly in the Cd-bearing phases, which are exchangeable, bound to carbonates, and associated with organic matter. This is principally due to the incorporation of root exudates, which modify pH and redox conditions of the rhizosphere. Elevated Cd concentrations in the shoots of A. xanthochlora (up to 8 mg.kg(-1)), C. cristatus (9 mg.kg(-1)) and H. maculatum (3 mg.kg(-1)) may represent a long-term hazard for livestock and human health since these plants are used either by grazing cattle or for medicinal purposes. On the contrary, R. acris, A. pseudoplatanus, and especially D. glomerata show lower Cd concentrations and are of minor concern with regards to their environmental impact. (C) 2014 Elsevier B.V. All rights reserved.
53 citations
TL;DR: The chromosomal positions of the 5S/25S rRNA genes of Hypericum perforatum, H. maculatum and H. attenuatum were comparatively determined by FISH, and six, three and seven chromosome pairs of the respective karyotypes were subsequently distinguished, indicating that H.perforatum probably arose by autotetraploidization from an ancestor closely related to H. Maculatum.
Abstract: The chromosomal positions of the 5S/25S rRNA genes of Hypericum perforatum (2n=32), H. maculatum (2n=16) and H. attenuatum (2n=32) were comparatively determined by FISH, and six, three and seven chromosome pairs of the respective karyotypes were subsequently distinguished. The rDNA loci between H. perforatum and H. maculatum seem to be identical (with respect to the ploidy difference), indicating that H. perforatum probably arose by autotetraploidization from an ancestor closely related to H. maculatum. The positional differences between the 5S rRNA gene loci of H. perforatum and H. maculatum on the one hand and H. attenuatum on the other argue against a previous hypothesis according to which H. perforatum originated from a remote interspecific hybridization between H. maculatum and H. attenuatum.
33 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2020 | 1 |
| 2017 | 2 |
| 2015 | 3 |
| 2014 | 2 |
| 2013 | 2 |
| 2012 | 1 |