aaelkhatib

Ahmed Ali Ahmed El-Khatib اد/ احمد الخطيب

Professor -

Faculty of science

Address: سوهاج ، مصر

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PHYSIOLOGICAL RESPONSE OF EUCALYPTUS ROSTRATA TO HEAVY METAL AIR POLLUTION

2004 | Keywords Air pollution, Heavy metals, Eucalyptus rostrata,
PHYSIOLOGICAL RESPONSE OF EUCALYPTUS ROSTRATA TO HEAVY METAL AIR POLLUTION
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 concentrations was found to have an important ... Read more

The response of some common Egyptian plants to ozone and their use as biomonitors

2003 | Keywords Egypt, common weed, biomonitor, ozone, Weeds, Ascorbic Acid,
The response of some common Egyptian plants to ozone and their use as biomonitors
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 recorded for five consecutive days ... Read more

Growth and energy content of three forage grasses from the Middle East rangeland

2001 | Keywords caloric value, water content, leaf area, dolychoblasts, brachyblasts, phenology, energy content, rangland, forage grasses,
Growth and energy content of three forage grasses from the Middle East rangeland
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 failure of sexual reproduction is mainly related to the ... Read more

The ecological significance of allelopathy in the community organization of Alhagi graecorum

2000 | Keywords Association Pattern, community organization, allelopathy, diversity index, association index, allelochemicals,
The ecological significance of allelopathy in the community organization of Alhagi graecorum
the alleopathic potential of alhagi fraecorum was studied and their role in its community organization was followed Read more

Adaptive responses of Alhagi graecorum under different habitat conditions

1999 | Keywords alhagi graecorum, adaptive mechanisms, habitat heterogenity,
Adaptive responses of Alhagi graecorum under different habitat conditions
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 phenotype-environment interaction or an ecomorphological pattern. Shoot cultures for plants grown ... Read more

Growth and physiological responses of wild oat to the allelopathic potential of wheat

1998 | Keywords wheat, wild oat, allelopathy,
Growth and physiological responses of wild oat to the allelopathic potential of wheat
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 wild oat plants with shoot extracts resulted in ... Read more

Differential trapping of heavy metals by hydrophytes in different water bodies near Sohag area, Upper Egypt

1998 | Keywords water pollution, Hydrophytes, Heavy metals,
Differential trapping of heavy metals by hydrophytes in different water bodies near Sohag area, Upper Egypt
hydrophytes expressed different affinity for heavy metals absorption from the polluted water Read more

Former and present vegetation of Kraman Island, Upper Egypt

1997 | Keywords River Nile, island ecology, Hydrophytes, vegetation,
Former and present vegetation of Kraman Island, Upper Egypt
Kraman Islan, River Nile at Sohag area , Upper Egypr suppot growth of different types of plant communities. Read more

Allelopathic potential of Zilla spinosa on growth of associate flowering plants and some rhizosphere fungi

1997 | Keywords Trichodesma africanum, Paecilomyces terricola, Zygophyllum coccineum, competition, Aspergillus nidulans, allelopathy, rhizosphere fungi, zilla spinosa,
Allelopathic potential of Zilla spinosa on growth of associate flowering plants and some rhizosphere fungi
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 germination. Shoot/root ratio of all test species increased significantly with increase ... Read more

Does allelopathy involve in the association pattern of Trifolium resupinatum?

1997 | Keywords Portulaca, Melilotus, allelochemicals, allelopathy, Qort, Association Pattern,
Does allelopathy involve in the association pattern of Trifolium resupinatum?
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 with those of vegetative plants. Under laboratory conditions, this inhibition was ... Read more