Ragab El-Mergawi

Abstract The holoparasite Orobanche crenata is considered the most damaging pathogens on the faba bean grown in the Mediterranean region. Sub-lethal dose of glyphosate was used for controlling O. crenata, but it caused injury effects on faba bean growth. Glyphosate inhibits the shikimic pathway of the synthesis aromatic amino acids (AAAs), phenylal...

Background Exogenous hormone applications modify the plant growth and development by inducing changes in their endogenous contents. However, it is not clear whether the effects of exogenous hormones on growth are direct or related with changes induced in endogenous hormones. Laboratory and greenhouse experiments were conducted to study the effect o...

Plant extracts could turn out to be natural herbicides to be used in weed control. This study was conducted to study the phytotoxic effects of methanol extracts obtained from Tamarix mannifera, Alhagi maurorum, Echinops spinosissimus, Haloxylon salicornicum, Lactuca virosa, Neurada procumbens, Ochradenus bacctus, and Cyperus conglomerates plants on...

The herbicidal potential of nine phenolic acids including p-hydroxybenzoic acid, protocatechuic, syringic, vanillic, gallic, salicylic, ferulic, p-coumaric and caffeic acid were evaluated against Corchorus olitorius and Phalaris minor weeds at the concentrations of 5, 10 and 20 mM. The effectiveness of phenolic acids on germination depended on targ...

The antifungal activity of fifteen wild plant species grown in the Al-Qassim region, Saudi Arabia, was investigated against the fungi species Fusarium solani, Botrytis cinerea, Alternaria alternata and Stemphylium botryosum at concentrations of 10, 20, 40 and 80 g/L. The inhibitory effect of test extracts varied among examined fungi, and Fusarium s...

Sugar types, sugar amounts, phenolic contents constituents were determined in fresh fruits of 17 Saudi date cultivars and the obtained values were correlated with the corresponding vales of glycemic index. Glucose and fructose were presented in all tested cultivars in the range 104–395 g kg⁻¹ and 82–361 g kg⁻¹, respectively. Glucose/fructose ratio...

Aqueous extract of celery (2.5-20 g l-1 , w/v) was evaluated for its phy-totoxicity against three weed species, under laboratory and greenhouse conditions. Celery extract had a strong inhibitory effect on germination and seedling growth of Corchorus olitorius, Echinochloa crusgalli and Portulaca oleracea seeds. From dose response curves of tested s...

BACKGROUND: Dates are consumed worldwide, and are an important fruit for many individuals in Saudi Arabia. Currently, limited information is available on the glycemic indices of different date varieties. OBJECTIVES: To determine the glycemic index (GI), glycemic load (GL) and glycemic response for 17 com- mon date varieties in Saudi Arabia. DESIGN...

Detailed information on the content of health-promoting components in date seeds will enhance our knowledge and appreciation for the use of date seeds in different variety of foods. Date seeds of ten Saudi Arabian cultivars were evaluated for antioxidant activity and total contents of phenolics, flavonoids, and tannins as well as phenolic acids and...

Impact Factor(JCC): 1.8207-This article can be downloaded from www.impactjournals.us ABSTRACT This study reports the effect of technological processing and fermentation of soy milk on the content of isoflavones and antioxidant status. HPLC determination method was used to monitor the concentration changes of two major dietary phytoestrogens present...

The effectiveness of different postharvest wash treatments at two levels (10 and 20 g/l) for different dipping times was determined to remove chlorpyrifos from date fruits treated at concentration of 2 mg/l. The recovered amount of chlorpyrifos was extracted based on the solid phase extraction (SPE) method and then analyzed by gas chromatography wi...

Faba beans are widely consumed in Egypt as a vegetable by many ways. A study was conducted to determine the levels of phenolic compounds and antioxidant properties of raw seeds, green seeds and sprouts of ten faba bean cultivars commonly consumed in Egypt. Nubaria 2, Sakha 2 and Nubaria 1 cultivars showed higher amounts of phenolic compounds and ex...

The effect of N levels and sources on the antioxidant components in vegetable is not completely understood. Therefore, greenhouse experiments were conducted to determine the changes in antioxidant capacity diphenyl-2-picrylhydrazyl (DPPH) and ferric reducing antioxidant power (FRAP), total phenolics, ascorbic acid, total carotene and lycopene conte...

Hendawy SF, Hussein MS, Youssef AA, El-Mergawi RA. 2013. Response of Silybum marianum plant to irrigation intervals combined with fertilization. Nusantara Bioscience 5: 22-29. This study was investigated to evaluate the influence of different kinds of organic and bio fertilization under different irrigation intervals on the growth, production and c...

Seeds from six selected jojoba genotypes were used in this study. Seed samples were analyzed for oil, protein, total carbohydrate, and simmondsin contents. The genetic relationships among jojoba genotypes were also determined. Highly significant differences among the genotypes were found for oil, protein, total carbohydrate and simmondsin contents....

To avoid any contamination risk of edible crops, the safety use of treated municipal wastewater is growing industrial non-food crops such as aromatic plants to produce volatile oils for manufacturing soaps, cosmetics and perfumes, etc. Therefore, two field experiments were conducted in a sandy soil to investigate the influence of treated domestic s...

In the recent years, there is an increasing demand for organic foods in Saudi Arabia, due to concerns of consumers about health and nutrition. In order to accurately draw any conclusion regarding the health benefits and nutrition superiority of organic food, the aim of the present study was to investigate the antioxidant activity, antioxidant compo...

Dates and camel milk have been reported to be used for prevention and treatment of various diseases in Arab countries. This study was designed to investigate the antioxidant activity of dates and camel milk, alone or as a mixture and their effect in lead acetate-poisoned rats. Lead was administered to rats in drinking water at a concentration of 0....

To avoid any contamination risk of edible crops, the safety use of treated municipal wastewater is growing industrial non-food crops such as aromatic plants to produce volatile oils for manufacturing soaps, cosmetics and perfumes, etc. Some investigators stated that aromatic plants can be grown in soils enriched with heavy metals without risk for m...

Three roselle, Hibiscus sabdariffa L. varieties (Sudani, Masri and White) were cultivated at three different locations to recognize the transportation ability of roselle cultivation from the narrow old valley land to broad new land in Egypt. Qena as origin in situ old land, El-Kanater as ex situ old land and Nubaria as ex situ new land were the con...

An efficient alternative protocol for cell proliferation and enhancement of sennoside production in suspension cultures of cassia angustifolia was developed. Among different combinations of growth regulators used for callus induction, 1 mg/l 2,4-D+ 2 mg/l kin gave the maximum values of callus growth presented as fresh and dry weights. Cell growth a...

Callus cultures of Vicia faba L. were established using stem sections of aseptically germinated seedlings when cultured on MS-medium contained 2,4-D, NAA and BA. Callus tissues were grown on various media and subjected to different incubation regimes. The results indicated that incubation at 25 C for 28 days was the best for callus growth, whereas...