Limoniastrum monopetalum L. is an interesting small shrub native to Greece and other Mediterranean countries with an attractive foliage, and blooming in the summer with pink flowers. In this work an anatomical and hystochemical study of the species were carried out in order to investigate the suitability of the L. monopetalum for use in urban and suburban areas as ornamental plant and its growth in hostile environments such as archeological sites, roof gardens, landscape restoration (e.g. quarries, roadsides, etc.). The results showed that the leaves of L. monopetalum are amphistomatic bifacial with leaf blade approx. 170 μm thick. The epidermal cells is relatively thick approximately 20 μm and covered by a 2 μm thick cuticle. Furthermore both surfaces of the leaves are entirely covered by salt crystals secreted by the salt glands, as this is revealed from fresh unprocessed specimens observed with the SEM.The histochemical tests showed the presence of terpenoids in the cell walls of the epidermal cells and in the leaf vascular tissues, phenolics, nitrites and alkaloids, flavonoids in the mesophyll cells, especially in the vacuoles, and lipids only in the cuticle. Both morphological anatomical and histochemical characteristics of the leaves indicate the xeromorphic character of the species which render L. monopetalum a suitable plant for ornamental use in a wide spectrum of areas with adverse conditions
The floating system is a promising alternative type of hydroponic seedling production system, which has not been much studied and disseminated in the flower industry. This study aimed to produce seedlings of Zinnia elegans in a floating system and to evaluate the influence of two organic (Codaphos & Codasting and Fish-Fert) and one inorganic nutrient solution formulations on the seedling growth parameters. Z. elegans seeds germinated at a high rate (76.6-82.1%) in all fertilization treatments with a T50 ranging from 9.54 to 10.50 days. Application of Codaphos and Codasting (organic fertilizer containing N- Codasting and P+K- Codaphos) in floating system resulted in better development of the aboveground parts and roots of seedlings comparing with the other organic and the inorganic fertilization. As a conclusion, the present study showed that organic fertilization, especially with Codaphos and Codasting, could successfully be used for the production of Z. elegans seedlings in a floating system; however, further studies must be carried out on this aspect.
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