الفهرس 
Introductiion
Protein analysisOnly 14 pages are availabe for public view
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Abstract
In the present study, A. graecorum was collected from seven different accessions picture two habitats, Mediterranean coastal habitat represented by New Damietta, baltim, El-Shehabia, and Sherbin and inland habitat represented by Aghour Al-Soughra, Kom Oshim, and Ein El-Selin. In this study, A. graecorum was investigated genetically and anatomically to clarify the effect of some environmental stresses such as drought, salinity as well as stability in water supply on plant. All the studied Alhagi graecorum taxa are diploid with sixteen chromosomes in somatic cells (2n=16). It is evident from the karyotype studies that none of the studied taxa have an identical chromosome set. According to the cytological study, the most primitive taxon was collected from Sherbin, while taxa from New Damietta and Kom-Oshim may be considered as the most advanced taxa. The anatomical investigation of A. graecorum leaves and stems showed some anatomical traits that help this plant to grow under stress conditions such as drought and salinity. One of the adaptation characters is the presence of tanniniferous compounds in the tissues of both leaf and stem. Tannins are plant polyphenols that are produced in tissues of many plant species that grow under stress conditions as a major response to the stressful conditions .These compounds can check excessive transpiration and serve as heat screen preventing overheated. Finally, this study revealed that there is a close correlation between the habitat type in which A. graecorum grow and the cytological characters, the anatomical adaptation features as well as the physiological response. Key words: Alhagi graecorum, Karotype, Cytological studies, Anatomical studies.