Effects of light intensities and varying watering intervals on growth, tissue nutrient content and antifungal activity of hydroponic cultivated Tulbaghia violacea L. under greenhouse conditions

Ncise, Wanga; Daniels, Chris; Nchu, Felix

doi:10.1016/j.heliyon.2020.e03906

Cited by 11 publications

(12 citation statements)

References 52 publications

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“…In addition, the increase in callus dry weight associated with a lowering in fresh weight and water content was higher in callus cultured in light than in dark proving that light in uences many aspects of growth in plants as reported by Behbahani et al (2011). Our data suggest that light stimulates water stress with PEG-6000 during callus growth, in agreement with (Ncise et al 2020). According to the authors, the combination of light and water stress affects plant physiology parameters such as cell growth.…”

Section: Effects Of Peg-on Antioxidant Enzymessupporting

confidence: 90%

Antioxidant activities in Pimpinella anisum L. callus responding to PEG-6000-induced water stress under light (12h-photoperiod) and dark conditions

Lamara

Boucelha

Djebbar

et al. 2022

Preprint

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Water stress is one constraint of the development potential of many plant species under in vitro tissue culture. The present study aims to assess the responses of anise callus tissues to two concentrations (5% and 7.5%) of PEG-6000 under darkness and light (12H-photoperiod) for 30 days. The exposure of calli to water stress recorded morphological and physiological variations in fresh weight and water content in the callus decreased with increasing dry weight. Malondialdehyde content increased progressively with concentrations used with higher values under dark than in light. The activity of antioxidant enzymes (SOD, CAT, APX, and GPOX) was affected by PEG-6000 concentrations and culture conditions. APX and CAT increased gradually with 5% and 7.5% of PEG-6000 with higher values in light, but SOD enzyme reacted differently with a slight increase with 5% in light and higher ones under dark with 7.5%. Additionally, GPOX activity decreased with both concentrations independently of light or darkness. The results revealed that anise calli under drought stress with 7.5% PEG-6000 were more resistant to the lack of water in our experimental conditions.

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Section: Effects Of Peg-on Antioxidant Enzymessupporting

confidence: 90%

Antioxidant activities in Pimpinella anisum L. callus responding to PEG-6000-induced water stress under light (12h-photoperiod) and dark conditions

Lamara

Boucelha

Djebbar

et al. 2022

Preprint

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“…Previously, Radovanović et al (2015) had reported that the ethanolic extracts of A. porrum are bioactive against Bacillus subtilis, Staphylococcus aureus and Aspergillus niger. Recently, Ncise et al (2020) reported that extracts of Tulbaghia violacea exposed to a decreased light intensity showed better antifungal activity against F. oxysporum than those from the same species that were cultivated under higher light intensity. The presence of the bioactive compounds, in terms of higher phenolic, alkaloid and flavonol contents, could influence the antifungal activities of extracts obtained from aerial parts of A. porrum.…”

Section: Discussionmentioning

confidence: 99%

Evaluating the effect of 40% and 0% shading levels on the secondary metabolites, antifungal and anti-insect activities of extracts of Allium porrum cultivated hydroponically under greenhouse conditions

Ntobela

Oguntibeju

Rautenbach

et al. 2022

Journal of Medicinal Plants for Economic Development

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Background: Allium species are generally reputed for their anti-pest properties; however, few studies have focused on optimising the quality and yield of anti-pest bioactive materials from these medicinal plants.Setting: Laboratory and greenhouse experiments were carried out on the Bellville campus of the Cape Peninsula University of Technology, Cape Town.Aims: This research study aimed to evaluate the effect of light intensity on the volatile constituents, antifungal and anti-insect activities of extracts obtained from Allium porrum L. cultivated hydroponically under greenhouse conditions.Methods: Seedlings of A. porrum were hydroponically grown under 40% shading and 0% shading conditions for 12 weeks. The phytochemical constituents of the aerial parts (leaf and bulb) of A. porrum were analysed. The antifungal activity against Fusarium oxysporum and the anti-insect activity on the grapevine mealybug (Planococcus ficus) was evaluated by microdilution and repellency bioassays, respectively.Results: Remarkably, the total polyphenol content was statistically higher (DF = 1, 6; F = 9.17; p 0.05) in plants exposed to 40% shade treatment. The gas chromatography-mass spectrometry (GC-MS) analysis revealed that the volatile compounds varied significantly (DF = 1; χ 2 = 3.435; p 0.05) between the two treatments. However, although a higher number of compounds (73) occurred in plants exposed to 40% shade than in those exposed to 0% shade (58), the shading effect on the number of compounds was not significant (DF = 1; χ 2 = 69.551; p 0.05). The acetone extracts of A. porrum that were cultivated under lower light irradiance showed a higher fungistatic activity against F. oxysporum in the antifungal bioassay.Conclusion: Broadly, this study revealed that lowering light intensity from 313 μmol m-2 s-1 to 153 μmol m-2 s-1 favoured a higher phenolic content, volatile constituents and higher anti-F. oxysporum activities in leeks.

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“…Interestingly, related to value in agriculture, a patent has been filed on the use of extracts of T. violacea as a plant protecting remedy as a substitute for chemical agents [ 72 ]. Some thought-provoking studies have shown that growth conditions including light intensities, watering frequency and pH, substantially impact both growth and biological potency of T. violacea extracts against Fusarium oxysporum ( F. oxysporum ) [ 73 , 74 ]. Likewise, storage conditions of dried plant material also affect the antimicrobial potency of extracts [ 56 ].…”

Section: The Genus Tulbaghiamentioning

confidence: 99%

The Phytochemistry and Pharmacology of Tulbaghia, Allium, Crinum and Cyrtanthus: ‘Talented’ Taxa from the Amaryllidaceae

et al. 2022

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Amaryllidaceae is a significant source of bioactive phytochemicals with a strong propensity to develop new drugs. The genera Allium, Tulbaghia, Cyrtanthus and Crinum biosynthesize novel alkaloids and other phytochemicals with traditional and pharmacological uses. Amaryllidaceae biomolecules exhibit multiple pharmacological activities such as antioxidant, antimicrobial, and immunomodulatory effects. Traditionally, natural products from Amaryllidaceae are utilized to treat non-communicable and infectious human diseases. Galanthamine, a drug from this family, is clinically relevant in treating the neurocognitive disorder, Alzheimer’s disease, which underscores the importance of the Amaryllidaceae alkaloids. Although Amaryllidaceae provide a plethora of biologically active compounds, there is tardiness in their development into clinically pliable medicines. Other genera, including Cyrtanthus and Tulbaghia, have received little attention as potential sources of promising drug candidates. Given the reciprocal relationship of the increasing burden of human diseases and limited availability of medicinal therapies, more rapid drug discovery and development are desirable. To expedite clinically relevant drug development, we present here evidence on bioactive compounds from the genera Allium, Tulgbaghia, Cyrtanthus and Crinum and describe their traditional and pharmacological applications.

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Effects of light intensities and varying watering intervals on growth, tissue nutrient content and antifungal activity of hydroponic cultivated Tulbaghia violacea L. under greenhouse conditions

Cited by 11 publications

References 52 publications

Antioxidant activities in Pimpinella anisum L. callus responding to PEG-6000-induced water stress under light (12h-photoperiod) and dark conditions

Antioxidant activities in Pimpinella anisum L. callus responding to PEG-6000-induced water stress under light (12h-photoperiod) and dark conditions

Evaluating the effect of 40% and 0% shading levels on the secondary metabolites, antifungal and anti-insect activities of extracts of Allium porrum cultivated hydroponically under greenhouse conditions

The Phytochemistry and Pharmacology of Tulbaghia, Allium, Crinum and Cyrtanthus: ‘Talented’ Taxa from the Amaryllidaceae

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