الفهرس | Only 14 pages are availabe for public view |
Abstract This thesis includes three parts; the 1st part is a descriptive and documentary accompanied with applied studies for some Egyptian Botanic Gardens (EBGs), and cacti and succulents. It was carried out in Orman BG (Giza), Zohria Trial Garden, Al-Azhar Park (Cairo), BG Botany Dept., Fac. of Sci., Alex. Uinv., Antoniades, and Al-Nozha Gardens (Alex.), Egypt, during 2004-2007. The objectives were (1) Case study from some EBGs; data were collected using ”Botanic Garden Questionnaire” to explore the opinions of EBGs directors and responsibles. (2) Documentary study on the cultivated cacti and succulents in these EBGs; data were collected during several visits to EBGs for recording plants at its present status and photographs were taken for documented taxa. (3) Future of cacti and succulents study; data were collected using questionnaire for visitors of Spring Flower’s Exhibition 2007. Frequencies and percentages were used for data analysis. The characteristics and definition of botanic gardens (BGs), gardens in Holy Q’uran, organizations working in BGs, distribution, number, types and activities of BGs, the role of BGs in conservation, the current situation of threatened cacti and succulents and the history and description of some EBGs were reviewed. From results and discussion, it can concluded that EBGs need reviewing the present status in comparison with the implementation of the “International Agenda for BG in Conservation”. There are necessities to find out a new ”Egyptian Botanic Garden” for collecting the dispersal endemic plants, interspecific, intraspecific, of natives and naturalized which are distributed over a vast area compromising a wide ecological variation and diverse gardens in the country. The 2nd part contains a pot experiment was conducted in the two successive seasons 2004/2005 and 2005/2006 at the Expt. Nursery of the Orn. Hort. Dept., Fac. of Agric., Cairo Univ., Giza, Egypt., with the aim of investigating the tolerance of sisal plant (Agave sisalana) to different levels of salinity with irrigation water [0, 1000, 2000, 3000, 4000, 5000, 6000 and 7000 ppm as NaCl and CaCl2 (1:1 by weight)]. In addition to estimate the effect of different fertilization treatments, [unfertilized, organic fertilization (50 g compost / pot), chemical fertilizer (NPK) (2g / pot), and compost plus NPK fertilizer], on reducing the unfavorable reflections of salinity on vegetative growth, chemical composition and anatomical structure. The recorded results indicated that increasing salinity levels decreased vegetative parameters. The chemical composition and anatomical studies supported and explained the recorded reduction of morphological traits under investigation due to salinity treatments. It may be concluded that Agave sisalana plants tolerates salinity in irrigation water till 4000 ppm concentration, meanwhile, decreases were remarkable at salinity levels of 6000 and 7000 ppm. On the other hand, the fertilization treatments reduced, to some extent, the negative effect of salinity. The 3rd part conducted with the aim of examining the effect of six salinity concentrations in irrigating water [0, 500, 1000, 1500, 2000 and 2500 ppm as NaCl and CaCl2 (1:1 by weight)] on seed germination, seedlings survival percentage and anatomical characters of Aloe striata and Ferocactus hamatacanthus plants. Best percentages of seed germination characters and seedlings survival were obtained with control, increase in salinity progressively decresed these percentages. The anatomical studies confirmed these results |