الفهرس 
Introduction and aim of the Work
Botanical aspectsOnly 14 pages are availabe for public view
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Abstract
The present work was carried out on the plant life of the River Nile in order to investigate the relationship between the influence of environmental pollution of the River Nile and its associated water bodies on the aquatic plants growing on it. 26 sites were selected in the study area to represent the different water ways during summer and winter seasons. However, the study area was concentrated mainly in the Nile Delta till El kanater El Khairia then two stands were taken at the Nile stream at El Giza and El Menya governorates. The sites in the Nile Delta were namely: River Nile branches (Damietta and Rosetta), Northern Deltaic lakes (Manzala, Borollus, Edku and Mariut lakes) and some irrigation and drainage canals. The study shows that; The total number of hyDROPhytes and canal bank species recorded in the study area are 113 species belonging to 34 families. During summer 74 species belonging to 34 families were recorded while, 95 species belonging to 32 families were recorded during winter. Analysis of seven heavy metals in the water, hydrosoil and plant samples (E. crassipes and L. stolonifera) revealed that: There is no clear pattern for metal concentrations during summer and winter seasons.The metal concentrations at hydrosoil were higher than that in the water samples. Fe, Mn and Zn attained the highest concentrations in plant organs compared to the other elements whereas; Cd had the lowest concentrations compared to the other elements. There is a marked regional variations of the metal content, thus the plants collected from drains and lakes exhibited the higher concentrations than the plants collected from the River Nile and irrigation canals. E. crassipes accumulates metals more than L. stolonifera but by low level, since L. stolonifera consider equivalent to E. crassipes in metals accumulation. Roots accumulate metal concentrations greater than that in aerial parts for all metals and two parts. The results indicate the ability of the two aquatic plants (E. crassipes and L. stolonifera) to absorb and accumulate high level of heavy metals. Cytological studies indicate that, the water samples collected from the study area have the ability to cause changes in mitotic index, percentage of mitotic phases, total percentage and types of abnormalities in root tips of Vicia faba. A variety of chromosomal abnormalities was observed such as micronuclei, stickiness, laggard, bridges, diagonal and disturbed chromosomes. In addition to these aberrations, there were some rare abnormalities such as ring chromosomes, star metaphase, non-congression, two-groups and multinucleated cells. Also, there was a pronounced variation in pollen fertility of wild plants from at the different study sites.