The nutritional quality of Spirulina platensis of Tamenrasset, Algeria

Spirulina platensis, a blue green microalga, has been used since ancient times as a source of food because of its high protein content (65%) and nutritional value. Lipids isolated from S. platensis have been shown to contain high levels of polyunsaturated fatty acids, including linolenic acid which is a precursor of arachidonic acid; this cyanobacteria contains, also, several kinds of sterols. The aim of this study is to evaluate the nutritional quality of S. platensis of Tamenrasset, Algeria. This study shows the analysis of nutritional quality of S. platensis of Tamanrasset, Algeria, to know nutritional value of our local strain. Biochemical analysis was performed for moisture, protein, glucose, lipid and minerals content. The chemical composition is based on the identification of fatty acids, using gas chromatography and quantification of the mineral elements by using the atomic absorption spectrometry (AAS). The results showed that S. platensis of Algeria has an important nutritional quality. Key words: Spirulina platensis, nutritional, quality, proteins, fatty acids

Correlation between Traits and Path Analysis Coefficient for Grain Yield and Other Quantitative Traits in Bread Wheat under Semi Arid Conditions

Current research was conducted out at the Field Crop Institute-Agricultural Experimental Station of Setif (Algeria) during 2010/11 and 2011/12 crop seasons. The objectives were to determine traits affecting grain yield in 29 bread wheat genotypes and to establish the nature of relation between grain yield and yield components by partitioning the correlation coefficients between grain yield and its components into direct and indirect effects by using simple correlation, stepwise regression and path analysis. The obtained results indicated that grain yield was positively correlated to biological yield, straw yield and number of spike per plant. The results of step by step regression showed that traits including biological yield and harvest index had justified approximately 99. 7% of grain yield variations. In the path coefficient analysis, biological yield and harvest index should be considered as the main yield components because these traits showed a positive direct effects towards increasing grain yield with the values of + 1.051 and + 0.364, respectively. Depending on the findings of this study, biological yield and harvest index may be used an effective selection criterion to improve genetic yield potential of bread wheat genotypes

Mycorhization par Tuber melanosporum Vitt de vitroplants de Quercus robur L et Quercus pubescens Willd

Les performances au champ des plants mycorhizés par la truffe sont limitées par l'hétérogénéité du matériel végétal jusqu'ici issu de semis. L'utilisation d'individus sélectionnés multipliés in vitro et de matériel fongique cloné permet de pallier ces inconvénients. Il est possible maintenant de réaliser l'association mycorhizienne entre divers chênes (Quercus robur L, Q pubescens Willd) et la truffe (Tuber melanosporum Vitt), aussi bien en conditions axéniques que gnotoxéniques ; toutefois la multiplication du chêne pubescent en grandes quantités nécessite certaines améliorations techniques.Controlled mycorrhization of Quercus robur L and Quercus pubescens Willd with Tuber melanosporum Vitt. The results in the field of plants carrying truffle mycorrhizae are limited by the heterogeneity of plant material which, up to now, has originated from seedlings (fig 1). The use of selected oak clones, multiplied in vitro and that of clonal "fungal" material should make it possible to reduce these disadvantages. From now on, it will be possible to achieve the mycorrhizal association between different oak species (Quercus robur L, Q pubescens Willd) and the truffle (Tuber melanosporum Vitt), both in "axenic" and in "gnotoxenic" conditions (fig 2). Nevertheless, the in vitro multiplication on a large scale of Quercus pubescens requires further technical improvement