https://dspace.univ-ouargla.dz/jspui/handle/123456789/20688 2026-04-18T18:59:59Z 2026-04-18T18:59:59Z Aouar Lamia Boukelloul Inas Benadjila Abderrahmane MEDJOUDJ Hacène ZAABAT Mourad https://dspace.univ-ouargla.dz/jspui/handle/123456789/21151 2019-07-07T07:54:49Z 2019-06-01T00:00:00Z

Titre: Streptomyces griseus Lac1: biocontrôle et propriétés promotrices de la croissance des plantes Auteur(s): Aouar Lamia; Boukelloul Inas; Benadjila Abderrahmane; MEDJOUDJ Hacène; ZAABAT Mourad Résumé: Biological control is considered as an alternative method to chemicals use, which constitute a danger to the environment and to humans. The use of several modes of action by an antagonist and its ability to adapt to the rhizosphere, contribute to that biological control becomes more sustainable than chemicals. The objective of the present work was to evaluate the in vitro and in planta antagonistic capacity of a rhizospheric actinobacteria strain Streptomycesgriseus Lac1, and the demonstration of its plant growth promoting characteristics (PGPR). In vitro antagonistic activity was tested against seven locally isolated phytopathogenic fungi and four plant pathogenic bacteria (Erwinia amylovora, Pectobacterium carotovorum, Agrobacterium tumefaciens and Streptomyces scabies). Also, this strain was tested for its in planta antagonist effect against S. scabies (on radish shoots placed in growth poutches). In this test, Lac1 antagonist strain and was inoculated at the same time as S. scabies, and also before and after 24 hours of inoculation by the pathogen. Root growth was estimated by WinRhizo software. The PGPR properties determined are the 3-indole acetic acid (assayed by HPLC) and the of siderophore production. the results show that this strain has a preventive and not a curative effect. Lac1 produces 3-indole acetic acid (AIA) in the presence of Trp as a precursor and the amounts produced depend on the Trp concentration. The siderophores produced are catechol type. This study showed that the Lac1 strain is promising because it has antibacterial and antifungal activities, exhibits in planta antagonism against S. scabies, in addition it produces AIA and siderophores. Description: Revue des bioressources

2019-06-01T00:00:00Z YAHIA Nadia MARNICHE Faiza https://dspace.univ-ouargla.dz/jspui/handle/123456789/21152 2019-07-07T08:22:09Z 2019-06-01T00:00:00Z

Titre: INVENTAIRE DES ESPECES LICHENIQUES ET ESTIMATION DE LA QUALITE DE L’AIR DANS LE MASSIF FORESTIER DE CHREA Auteur(s): YAHIA Nadia; MARNICHE Faiza Résumé: Lichens are fungi mainly Ascomycetes that live in association with a population of green algae or cyanobacteria. They are considered as biological indicators to analyse the fate and health of forest ecosystems. The present work consists of inventing epiphytic lichens in the Chrea forest, and using them as bio-indicators for the estimation of air quality. After the choice of the five study stations according to their phorophyte and their altitude, a lichenic survey is carried out. After the choice of the five study stations according to their phorophyte and their altitude, a lichenic survey is carried out. The estimation of the air quality is determined according to the method of KIRSCHBAUM and WIRTH. Lichen diversity showed the presence of 16 species with an abundance of 52 lichens. As for the estimation of the air quality, the calculation of the index reveals the dominance of two high and medium classes. Description: Revue des bioressources

2019-06-01T00:00:00Z BENMEHAIA Mohamed Amine https://dspace.univ-ouargla.dz/jspui/handle/123456789/21158 2019-07-07T08:22:27Z 2019-06-01T00:00:00Z

Titre: LA BIMODALITE DES DISTRIBUTIONS DE LA TAILLE DE LA FERME: ANALYSE DES FERMES ALGERIENNES PAR L'ESTIMATION DE LA DENSITE DU KERNEL Auteur(s): BENMEHAIA Mohamed Amine Résumé: This paper investigates the nature of farm size distribution in Algerian agriculture, where cultivated area of the farm is used as a measure of farm size. Using two comprehensive datasets of the Algerian Ministry of Agriculture (20,810 palm date farms and 3,296 industrial tomato growers). Results of kernel density estimation provide evidence on the bimodality of the farm size distribution. The study attempts to explain this by the technological features of farming systems, suggesting that the dual nature (traditional vs. modern) of farming system in Algeria shapes the farm size distributions Description: Revue des bioressources

2019-06-01T00:00:00Z BAHLOULI F ZEDAM A SLAMANI A BENDIF H BENMEHAIA R TELLACHE S https://dspace.univ-ouargla.dz/jspui/handle/123456789/21150 2019-07-07T07:53:34Z 2019-06-01T00:00:00Z

Titre: EFFET DES DIFFERENTES CATEGORIES D’AGE DE L’ARBRE DANS LE COMPORTEMENT DE QUELQUES VARIETES D’ABRICOTIER (Prunus armeniaca L.) DANS LA REGION DE MAGRA, M’SILA, ALGERIE Auteur(s): BAHLOULI F; ZEDAM A; SLAMANI A; BENDIF H; BENMEHAIA R; TELLACHE S Résumé: The apricot tree is one of the most widespread fruit species in Algeria; M'sila wilaya is one of the most important regions of Algeria which contains the most popular varieties. Our experiment is interested in several aspects concerning the study of three varieties behavior (red Louzi, Bulida and Pavit) of apricot trees towards the effect of the tree age category, for each phenological stage of the annual biological cycle of the apricot tree's and the fruits physical and biochemical characteristics. The Bulida variety is the earliest, followed by the Pavit variety and finally by the variety red Louzi which is the latest. It is noted that the influence of tree age is very important on the percentage of phenological stages, from flower bud to fruit maturity, usually the highest value is noted in mature trees. The good physical characteristics of the fruits are in favor of the adult trees, whereas the organoleptic characteristics are better in the fruits of the old trees. Description: Revue des bioressources

2019-06-01T00:00:00Z