Topic
Eucomis comosa
About: Eucomis comosa is a research topic. Over the lifetime, 10 publications have been published within this topic receiving 116 citations.
Papers
TL;DR: The effects of gellan gum and its depolymerized form oligo-gellan, on growth and antimicrobial activity of two ornamental species used in natural medicine and agriculture are evaluated.
Abstract: One of the visible trends in the cultivation of plants, particularly of medicinal ones, is the increasing interest of researchers in polysaccharides and their derivatives that show biostimulatory properties and are also safe to use. In the current study, we evaluated the effects of gellan gum and its depolymerized form oligo-gellan, on growth and antimicrobial activity of two ornamental species Eucomis bicolor and Eucomis comosa used in natural medicine. The biopolymers were applied in the form of bulb coating prepared by using polyelectrolyte complexes. In both species investigated, gellan gum and oligo-gellan enhanced the fresh weight of leaves and bulbs, the performance of the photosynthetic apparatus, and the leaf content of basic macronutrients. In comparison with the control, the plants treated with oligo-gellan accumulated more biomass, were first to flower, and had the highest leaf content of potassium. The extracts from the bulbs treated with gellan gum and oligo-gellan showed higher effectiveness in reducing the count of Bacillus atrophaeus, Escherichia coli, and Staphylococcus aureus than those from the bulbs not treated with the polysaccharides. The research described here largely expands our current knowledge on the effects of gellan gum derivatives and has a huge practical potential in agriculture production.
44 citations
TL;DR: Antibacterial activity, as detected in the bioautographic and microplate assays against Staphylococcus aureus, was shown for thirteen homoisoflavanones isolated from six Hyacinthaceae species, employed as traditional medicines in South Africa.
31 citations
TL;DR: Overall rooting percentages were 95%, 98%, and 100% for E. autumnalis, E. comosa, and E. zambesiaca, respectively, and plant survival for rooted shoots of all three species was 100% following transfer to a 1 perlite : 1 peat (v/v) medium in the greenhouse.
Abstract: Shoot formed in vitro from twin-scale explants of Eucomis autumnalis (Mill.) Chitt., E. comosa (Houtt.) Wehrh., and E. zambesiaca Bak. cultured on Murashige and Skoog (MS) basal medium containing 0.0, 4.4, 11.1, or 22.2 μM BA and 0.0 or 5.4 μM NAA. In all three species, shoot proliferation was obtained from single-shoot explants subcul- tured on medium supplemented with 4.4, 11.1, or 22.2 μM BA and 0.0 or 5.4 μM NAA. Shoots of all three species rooted readily on MS medium supplemented with 0.0, 2.7, 5.4, or 10.8 μM NAA. Overall rooting percentages were 95%, 98%, and 100% for E. autumnalis, E. comosa, and E. zambesiaca, respectively. Plant survival for rooted shoots of all three species was 100% following transfer to a 1 perlite : 1 peat (v/v) medium in the greenhouse. Chemical names used: 6-benzyladenine (BA); 1-naphthaleneacetic acid (NAA).
25 citations
TL;DR: From the bulb wax of Eucomis comosa (HOUTT.) WEHRH.5, 7-Dihydroxy-8-methoxy-chroman-4-one (1) was isolated.
Abstract: 5, 7-Dihydroxy-8-methoxy-chroman-4-one from the Bulb Wax of Eucomis comosa
From the bulb wax of Eucomis comosa (HOUTT.) WEHRH. (Liliaceae) 5, 7-dihydroxy-8-methoxy-chroman-4-one (1) was isolated. The structure was confirmed by direct comparison with a synthetic specimen. 1 is the first natural chroman-4-one which is unsubstituted in the heterocyclic ring.
15 citations
TL;DR: The results of the study revealed that MHPC/cocoa butter coatings had no influence on the growth of Staphylococcus aureus, Bacillus cereus, and Bacillus atrophaeus, and the influence of accelerated UV-A and Q-SUN irradiation on the antimicrobial properties and the barrier characteristic of the coatings.
Abstract: The purpose of this research was to examine the antimicrobial properties against Gram-positive bacteria, as well as the water vapour characteristic of polylactic acid (PLA) films covered with a methyl–hydroxypropyl–cellulose (MHPC)/cocoa butter carrier containing Eucomis comosa extract as an active substance. The second purpose of the study was to evaluate the influence of accelerated UV-A and Q-SUN irradiation (UV-aging) on the antimicrobial properties and the barrier characteristic of the coatings. The results of the study revealed that MHPC/cocoa butter coatings had no influence on the growth of Staphylococcus aureus, Bacillus cereus, and Bacillus atrophaeus. MHPC/cocoa butter coatings containing E. comosa extract reduced the number of bacterial strains. MHPC/cocoa butter coatings also decreased the water vapour permeability of PLA. It was shown that accelerated UV-A and Q-SUN irradiations altered the chemical composition of the coatings containing cocoa butter. Despite the alteration of the chemical composition of the layers, the accelerated Q-SUN and UV-A irradiation had no influence on the antimicrobial properties of E. comosa extract coatings against S. aureus and B. cereus. It was found that only Q-SUN irradiation decreased the coating activity with an extract against B. atrophaeus, though this was to a small degree.
10 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2018 | 2 |
| 2017 | 1 |
| 2016 | 1 |
| 2013 | 1 |
| 2007 | 1 |
| 2006 | 1 |