الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Among all of biostimulants, microalgae have received considerable interest because they are locally available and cost effective. So, the present study is concerning with investigating the different biological activities of Spirulina platensis and applying its liquid extract as priming solutions for promoting germination and seedling growth of T. aesvivum and L. termis. SLEs with different was applied for investigating their potentiality in alleviating negative drawbacks of seawater supplementation on T. aesvivum and L. termis. The major research activities and outcomes of the present study can be summarized as follows : Extraction protocols of S. platensis biomass using different organic solvents (methanol, acetone, chloroform and petroleum ether) were applied using four different extraction protocols (soaking, Soxhlet, Osmotic shock 10% NaCl and autoclaving and detection its phytochemical constituents. Biological Activities of S. platensisextracts including Antioxidant Activity, Cholesterol reduction assay, Antimicrobial Activity Assay, Anticancer activity of different acetone extracts of S. platensis 1. Preparation of SLEs and selection the concentration that give the maximum enhancement of seedling growth (2.0%). 2. Chemical characterization of SLEs including Total nitrogen, phosphorus, total carbohydrates, total phenol, amino acids and flavonoids content in addition to Fourier Transform Infrared Spectrometry (FT-IR) elucidated the presence of O-H, N-H, COO-, S=O designating the presence of alcohols, proteins, carboxylic acids and sulfates. 3. Seeds of T. aestivum and L. termis was primed separately with the used extracts A.platensis Liquid Extract (2%SLE), and germinated for seven days at 25° C germination bioassay reveSLEd that 2%SLE had the superiority in all determined germination criteria GI, RSG, SIV and RRE in T. aestivum and L. termis as following GI 2.09, 1. 37, RSG 110.07, 107.4, SIV 378.48, 310.9, and RRE 113.85, 175.7, respectively. 4. It was found that 2% SLE induced the maximum increases in all morphological parameters that were improved significantly in the following descending order 2% SLE> 4% SLE > 1% SLE > control 5. Data reveSLEd that 2% SLE have the potentiality to ameliorate the harmful effect of salinity on seedling growth when irrigated with 10% and 25% seawater as was noticed in T. aestivum and L. termis. This recovery could be attributed to the richness of microalgae extracts proteins, carbohydrate, amino acids, Total phenolic components and total antioxidants capacity.