Influence of nitrogen fertilizers on yield and antifungal bioactivity of Tulbaghia violacea L.

Heever, E. van den; Allemann, J.; Pretorius, J. A.

doi:10.1177/0960327108099529

Cited by 11 publications

(3 citation statements)

References 12 publications

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“…However, only few publications have reported on the biological activities of T. violacea (Jacobsen et al, 1968;Sparg et al, Ramesar et al, 2008;van den Heever et al, 2008;Kirby & Meyers, 2010;Ebrahim & Pool, 2010). Ramesar et al (2008) reported that crude leaf extracts of T. violacea inhibited angiotensin I converting enzyme (ACE) and also blocked the rise in mean arterial pressure (MAP) associated with infusion of exogenous angiotensin I in normotensive male Wistar rats;…”

Section: Famous African Medicinal Plants Includementioning

confidence: 99%

Effect of Tulbaghia violacea on the blood pressure and heart rate in male spontaneously hypertensive Wistar rats

Raji

Mugabo

Obikeze

2012

Journal of Ethnopharmacology

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Effect of Tulbaghia violacea on the blood pressure and heart rate in male spontaneously hypertensive Wistar rats I. A. RAJITulbaghia violacea Harv. (Alliaceae) is a small bulbous herb which belongs to the family, Alliaceae, most commonly associated with onions and garlic. In South Africa (SA), this herb has been traditionally used in the treatment of various ailments, including fever, colds, asthma, paralysis, hypertension (HTN) and stomach problems. The aim of this study was to evaluate the effect of methanol leaf extracts (MLE) of T. violacea on the blood pressure (BP) and heart rate (HR) in anaesthetized male spontaneously hypertensive rats; and to find out the mechanism(s) by which it acts.The MLE of T. violacea (5 -150 mg/kg), angiotensin I (ang I, 3.1 -100 µg/kg), captopril (10 mg/kg), angiotensin II (ang II, 3.1 -50 µg/kg), losartan (30 mg/kg), phenylephrine T. violacea (60 mg/kg) and captopril (10 mg/kg) were injected intraperitoneally into iii some SHR for 21 days to investigate the chronic effect of these agents on plasma levels of aldosterone. The mean change, the mean of the individual percentage changes and the percentage difference (in mean) observed with each intervention was calculated and statistically analyzed using the Student's t test for significant difference (p < 0.05). The Microsoft Excel software was used for statistical analysis.T. violacea significantly (p < 0.05) reduced the systolic, diastolic, and mean arterial BP;and HR dose-dependently. In a dose-dependent manner, ang I, ang II, phenylephrine significantly (p < 0.05) increased the BP, while propranolol, muscarine and atropine reduced the BP. The increases in BP due to dobutamine were not dose-dependent. In a dose dependent manner, phenylephrine and propranolol reduced the HR, while dobutamine increased the HR. The effect of ang I, ang II, muscarine and atropine on HR were not dose-dependent; with both increases as well as decreases observed with ang I, and II and atropine, while decreases were seen with muscarine. Captopril produced significant (p < 0.05) reduction in BP which were not associated with any change in HR.The co-infusion of ang I with the MLE produced significant (p < 0.05) reduction in BP, which were not associated with significant changes in HR. The co-infusion of ang II with the MLE did not produce any significant changes in BP or HR when compared to the infusion of the standard drug alone. The co-infusion of phenylephrine with the MLE did

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Section: Famous African Medicinal Plants Includementioning

confidence: 99%

Effect of Tulbaghia violacea on the blood pressure and heart rate in male spontaneously hypertensive Wistar rats

Raji

Mugabo

Obikeze

2012

Journal of Ethnopharmacology

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“…Luseba's findings could have been a result of the effect of abiotic (Ramakrishna and Ravishankar, 2011) and or biotic factors, which could regulate the levels of secondary metabolites up or down in the natural environment (Dixon and Paiva, 1995) depending on severity of stress. This may include chemotypes, pathogens, soil pH (Economakis et al, 2002;Rajakaruna et al, 2002), nutrients (Van den Heever et al, 2007), temperature, rainfall, geographic origin (Hussain, 2009), plant genotype (Khosh-Khui et al, 2012), time of harvest and behaviour of different compounds (Ade-Ademilua and Mbah, 2013). Varying effects of these factors are an indication of the difficulty to have optimal conditions in nature that could ensure consistent quality of the active principles of plants.…”

Section: Plant Speciesmentioning

confidence: 99%

Effect of water stress on antimicrobial activity of selected medicinal plant species

Netshiluvhi

Eloff

2016

South African Journal of Botany

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a b s t r a c t Available online xxxx Edited by J.J.M. MeyerSome traditional medicinal practitioners believe that cultivated medicinal plants will lose healing powers, compared to plants growing in nature. Several scientists have shown that a plant under stress will produce secondary metabolites that may influence its medicinal properties. This perception has negative effects on the cultivation of medicinal plants to control local extinctions by uncontrolled collection of medicinal plants. To investigate this perception we examined the effect of water treatments on the antimicrobial activity of selected plant species grown under controlled conditions. Firstly, Tulbaghia violacea and Hypoxis hemerocallidea plants were subjected to watering regimes of 1000 ml of water in intervals of 3,14 and 21 days in a preliminary experiment. Subsequently, T. violacea, Leonotis dysophylla and Bulbine frutescens were subjected to different water regimes of 50, 100, 200 and 500 ml every second day for 240 days. Air-dried leaves of matured plants were finely ground and extracted with acetone. Minimum inhibitory concentration (MIC) and total activity were determined in order to evaluate the antimicrobial activity and potential use of plant extracts against four bacteria and two fungi. In general there were no statistically significant differences in MIC and total activity values and there were no clear trends across treatments. The applied water treatments did not cause significant effects on the antimicrobial activity of extracts. The fact that water stress did not materially influence antimicrobial activity does not mean that water stress does not affect other medicinal properties. Nevertheless our results question the general perception of traditional medicinal practitioners that plants growing under natural stress conditions have higher biological activities at least as far as water stress related to antimicrobial activities is concerned.

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“…An increase in sulphur supply is related to an increase in alliin content of leaves and bulbs of garlic (Van den Heever, 2006), whereas nitrogen fertilization is necessary for ensuring successful vegetative growth of garlic (Kakara et al, 2002). Stork et al (2004) reported that the application of nitrogen along sulphur at an early vegetative (sprouting) stage is useful for the promotion of strong vegetative growth before cold winter months.…”

Section: Introductionmentioning

confidence: 99%

Growth and Nutrients Content and Uptake of Garlic (<i>Allium sativum L.</i>) as Influenced by Different Types of Fertilizers and Soils

Diriba-Shiferaw¹,

Nigussie-Dechassa²,

Kebede³

et al. 2013

Sci. Technol. Arts Res. J.

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Article InformationFarmers strive to produce high yield and good quality garlic both for consumption and economic value but soil fertility depletion is among the major impediments to sustained garlic production, especially in the less developed countries, because of limited application of suitable rate, type and sources of fertilizers. Thus, the study was conducted on Andosol and Vertisol soils at Debre Zeit Agricultural Research Center, Ethiopia, for two consecutive (dry and main rainy) seasons to assess the effect of various rates of compound fertilizers on growth, and nutrient content and uptake of garlic. The treatments consisted of control (unfertilized), one level of recommended NP (92/40 kg ha -1 ), three levels of Azofertil (100, 200, 300 kg ha -1 ), four levels of Basic (100, 200, 400, 600 kg ha ). The experiment was laid out as a randomized complete block design with three replications at each site. The morphological characters like plant height, neck thickness and leaf area index of garlic at different growth stages, and the contents and uptake of nutrients like nitrogen, phosphorus, potassium and sulphur of the crop were significantly increased due to the applications of higher levels of Azofertil, Basic and D-coder compound fertilizers on Andosol soil during both seasons. However, the lowest growths, and nutrients content and uptake were recorded from the garlic plants fertilized with lower levels of the three compound fertilizers, recommended NP and the control plot, especially on Vertisol. Generally, plant growths, and nutrients contents and uptake of garlic exhibited good results with the application of D-coder fertilizer at the rate of 200 kg ha -1 followed by Azofertil at the rate of 300 kg ha -1 on Andosol during dry season by irrigation.

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Influence of nitrogen fertilizers on yield and antifungal bioactivity of Tulbaghia violacea L.

Cited by 11 publications

References 12 publications

Effect of Tulbaghia violacea on the blood pressure and heart rate in male spontaneously hypertensive Wistar rats

Effect of Tulbaghia violacea on the blood pressure and heart rate in male spontaneously hypertensive Wistar rats

Effect of water stress on antimicrobial activity of selected medicinal plant species

Growth and Nutrients Content and Uptake of Garlic (<i>Allium sativum L.</i>) as Influenced by Different Types of Fertilizers and Soils

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