Ahmed A El-Khatib

Ahmed A El-Khatib
Sohag University · Department of Botany

Professor of plant ecology

About

41
Publications
8,556
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830
Citations
Additional affiliations
May 1987 - present
Sohag University
Position
  • professor of plant ecology

Publications

Publications (41)
Article
We studied the allelopathic effects of two halophytes (Arthrocnemum macrostachyum and Halocnemum strobilaceum), growing in coastal areas of Burj Alarab and Manzala, Egypt, on the seed germination, chlorophyll content, leaf area, shoot length, and esterase and superoxide dismutase activities of Eruca sativa. The shoot aqueous extracts (0, 10, 20, 30...
Article
Full-text available
The present study aimed to explore the tolerance potential of Cd, Pb and Cu and physiological alterations in two common tree species growing in Minia governorate (Egypt) namely: Eucalyptus globulus and Ficus nitida and to investigate the leaf features [leaf area (LA) and specific leaf area (SLA)] associated with the phytoremediation process. The fi...
Article
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Leaf and bark of trees are tools for assessing the effects of the heavy metals pollution and monitoring the environmental air quality. In this study, the possibility of using leaves and bark of two urban trees, namely, Ficus nitida and Eucalyptus globulus as a bioindicator of atmospheric pollution was evaluated by determining the composition of hea...
Article
Full-text available
The ability of aquatic macrophytes to bioaccumulate toxic metals relative to the concentrations of these metals in wastewater has led to their use as phytoremediators. Lead (Pb) is among the most serious environmental contaminants. This study assesses the gibbous duckweed (Lemna gibba L.) as a bioaccumulator and bioindicator of Pb pollution. The pl...
Article
For the purpose of this study, two common tree species namely: Ficus nitida and Eucalyptus golobulus were selected in the areas surrounding Asyut Superphosphate Fertilizer Plant, Upper Egypt. Physiological and anatomical responses of tree leaf due to airborne particles deposition were studied. Leaves exhibited reduction in their surface area, dry w...
Article
Full-text available
Abstract To determine the mechanism of regulation of superoxide dismutase (SOD; EC 1.15.1.1) isozymes in halophytes at the cellular level, we isolated calluses from Suaeda maritima plants native to Japan and Egypt. Calluses from Egyptian S. maritima could grow in a high salt medium (~400 mM NaCl), whereas Japanese S. maritima calluses could not. Th...
Article
Full-text available
The present work through light on the role of allelopathic potential of Calotropis procera on some growth and physiological parameters of three cultivated crops. The selected species, namely; cucumber, tomato, and wheat were grown in a pot experiment under six different concentrations of aqueous leaf extract ranged from 0 % to 50 % (w/v) with 10 %...
Article
Key message: Suaeda maritima varieties native to Japan and Egypt were cultured under aseptic conditions. The varieties differed in genetic distance but exhibited similar expression profiles of superoxide dismutase isozyme genes. The expression characteristics of superoxide dismutase (SOD; EC 1.15.1.1) isozyme genes from halophytic Suaeda marit ima...
Data
In view of their potential bioaccumulation of heavy metals, Ceratophyllum demersum and Myriophyllum spicatum was studied under hydroponic cultures enriched by different Pb concentrations (25, 50, 75 mg/l) for 1-7 days. Both species exerted remarkable capabilities to concentrate Pb in their tissues as compared to control. The highest accumulation va...
Article
Full-text available
Comparisons were made between the anatomical and morphological changes in olive tree leaves from a site with relatively clean air (Al-Khadra area), and two sites (al-Khums and Zelatin) near to cement factories in the area east to Tripoli, Libya. Olive tree leaves exhibited marked variations in their morphological and anatomical characteristics, in...
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Full-text available
The concentrations of Cd, Cu, Pb, and Zn in sediments, water, and different plant organs of six aquatic vascular plant species, Ceratophyllum demersum L. Echinochloa pyramidalis (Lam.) Hitchc. & Chase; Eichhornia crassipes (Mart.) Solms-Laub; Myriophyllum spicatum L.; Phragmites australis (Cav.) Trin. ex Steud; and Typha domingensis (Pers.) Poir. e...
Article
Vegetation and soil were sampled in 74 stands representing habitat in the different phytogeographical regions of Egypt where Convolvulus species were recorded. Two Way Indicator Species Analysis (TWINSPAN) classified the vegetation into six groups. Each of them occupied a distinct type of habitats. Convolvulus species are assigned as indicator spec...
Article
Soil infested with Chenopodium murale and amended with it were investigated to verify their allelopathic effects on seedling emergence and some growth and physiological parameters of five test species, Trifolium alexandrinum, Triticum aestivum, Melilotus indicus, lycopersicum esculentum and Cucumus sativus. The two types of soil exhibited phytotoxi...
Article
Particulate pollution is a serious concern in developed countries especially in urban and suburban areas where it has adverse effects on human health, exacerbating a wide range of respiratory and vascular illnesses. Data are now available which indicate that similar problems probably occur in countries in transition and may indeed be worse where na...
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Full-text available
The physiological response of Eucalyptus rostrata due to exposure to heavy metal air pollutants was investigated. The heavy metals Cu, Cd, Fe, and Pb were applied to the above ground parts of the plants, under greenhouse conditions. The metal contents were proportional to the metal concentration in the sprayed solutions. Increasing sprayed metal co...
Article
Full-text available
Bioassays on Chenopodium murale demonstrated that root and shoot aqueous extracts reduced the seed germination, seedling establishment, plant growth and metabolite production of four target species. Leaf area and dry matter production showed a decreasing trend in response to the different treatments. Similar effects were found for pigment, carbohyd...
Article
Relative sensitivity of five common Egyptian plant species namely, Senecio vulgaris, Malva parviflora, Sonchus oleraceus, Medicago sativa and Melilotus indicus to elevated levels of ozone has been studied. The plants were exposed to charcoal filtered air (CFA) and different levels of O3 (50 and 100 ppb) for 5 h per day. The studied parameters were...
Article
This study was conducted on three naturally growing populations of the perennial grasses Panicum turgidum Forssk, Lasiurus scindicus Henrard and Pennisetum divisum Henrard in Egypt, south west Saudi Arabia and Qatar. Vegetative reproduction occurs by rhizome growth and sexual reproduction by tillering, where each tiller may end with a spike. The fa...
Article
Field study revealed that species diversity index of the community was 0.597. The data of interspecific association index of Alhagi graecorum and each of its associates, Chenopodium murale, Glinus lotoides and Malva parviflora, were 0.35, 0.41 and 0.33, respectively. Therefore, a net negative association and low diversity among the species were the...
Article
With the aim of specifying how A. graecorum adapts itself under different environmental conditions, 60 sites within three different habitats in Egypt were investigated. During one vegetation period, seeds, plant shoots and soil samples were analysed. The correlation between soil factors and morphological characteristics premises the expression of a...
Article
Zilla spinosa plant part extracts exhibited significantly different inhibitory effect on the seed germination and seedling growth of its associate species. Shoot extract reduced the percentage germination and seedling length of different test species more than root extract. Except of Z. coccineum, seedling growth was more sensitive than seed germin...
Article
Greenhouse experiments were conducted to discover the effects of the tissue extracts and competition of wheat (Triticum aestivum L.) on the growth attributes of wild oats (Avena fatua L.). Water-soluble toxins from living tissues of wheat significantly decreased the growth attributes of wild oats. In comparison with the control, the irrigation of w...
Article
The application of Two Way Indicator Species Analysis (TWINSPAN) classified the island into four different habitat types. Each of them comprises different communities with indicator species of their own. Deterended Canonical Correspondence Analysis (DCCA) was used to study species-environment relationships. Accordingly, the most important environme...
Article
Indoor experiments demonstrated that allelopathic potential of rosette and flowering plants of qort is an important factor explaining the growth reduction of its associated species. Aqueous tissue extracts of flowering plants exhibited strong inhibitory effects on the germination percentage and radicle growth rate of the tested species as compared...

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