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An experiment was conducted .in the laboratory of Seed Technologr Research Deparhnent, Field crops Research Institute, Agricultural Research centre, Giza during February lggg to deterrrine the effect of differeat levels of *linity 10, i000,4000, 6000, 8000, 10000 and 12000 ppm of the salt *i"t,." Nacl and cacl2, 1:1 wlw) on gennination percentageof reucaenaseeds. The second experiment was a pot experimeat which was carried out at the

Das Perchlorbrenzkatechinderivat (I) wird mit Diazoessigsäureester (II) oder dem Chloressigsäureester (III) in das Phenoxyessigsäurederivat (IV) übergeführt, das zur Hydroxyphenoxyessigsäure (V) verseift wird.

The present research was performed on Magnolia grandiflora L. which is considered as one of the most beautiful ornamental trees, belongs to the family Magnoliaceae, because of its showy, fragrant, ivory flowers and large evergreen leaves. It is aimed to throw light on more information about the botanical characteristics of magnolia trees grown in Egypt. Botanical studies include descriptions of height, trunk, bark, shoots, branches, leaves, flowers, fruits and seeds as well as anatomy of vegetative organs of this important tree. Seed germination and seedling growth were also considered. Moreover, breaking seed dormancy by cold stratification and / or GA 3 treatment and their influence on vegetative growth and photosynthetic pigments were investigated.The results revealed that cold stratification of seeds at 4 o C for three months during the winter before planting in spring is very necessary for breaking dormancy and enhancement of germination of magnolia seeds. Moreover, soaking stratified seeds in 150 ppm GA 3 for 24 hours just before sowing induced significant increase in the percentage of seed germination more than that recorded by cold stratification the alone. Such treatment also induced prominent increases in chloroplast pigments of leaves of magnolia plants aged six months.