https://dspace.univ-ouargla.dz/jspui/handle/123456789/27335 2026-04-22T01:51:30Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/27350 Titre: PROLIFERATION AND ROOTING TESTS OF Prunus avium ROOT SEGMENTS CUTTINGS: EFFECT OF AUXIN AND CUTTING DATE Auteur(s): JDAIDI Nouri; ALOUI Foued; SELMI Houcine; CHABAANE Abees Résumé: Prunus avium (Rosaceae) is a component of biodiversity in forest ecosystems: its fruits are eaten by many birds and its early flowering gives it a high aesthetic value. In northwestern Tunisia, Prunus avium is a species exploited as a rootstock for cherry trees and as wood for cabinet making by local populations. The natural stands, which have been steadily decreasing for several decades, are threatened by various anthropic pressures, which are increasingly strong, reducing the species' natural regeneration capacity. The natural renewal of the wild cherry ecosystem in Tunisia is difficult, which makes it possible to advance the techniques of artificial vegetative propagation to improve the distribution of this species. The present study focuses on the production potential of rooted seedlings from root segment cuttings. The study shows that this type of cuttings is significantly influenced by the sampling date and the use of a growth hormone (IBA). The best results (60% rooting), were obtained for the January cutting and 50 mg/l of IBA. Rooting of 10% of the cuttings was achieved in the absence of the AIB treatment for the in month of January. Description: Algerian journal of arid environment 2021-06-30T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/27349 Titre: SPATIO-TEMPORAL DYNAMICS OF STEPPIC LANDSCAPES: DJEBEL YOUSSEF - SETIF (ALGERIA) Auteur(s): HANANE Gharbi; SABAH Chermat Résumé: Djebel Youssef, who possesses particular characteristics in terms of geographical isolation in the high Setifian plains, contains a very important floristic diversity. Currently, its plant formations were entering a phase of intense and continuous degradation, causing great distruption of the plant cover with the regression and disappearance of vulnerable and endemic species. This degradation is mainly due to anthropic action and climatic conditions, particularly recurrent periods of drought. In order to the preserve and protect this ecosystem, spatio-temporel monitoring of vegetation evolution was applied by using of landat satellite images (TM 5 and OLI 8), forming several study scenes. Knowledge of vegetation distribution and dynamics allows detecting changes in the state of vegetation cover over a 10-years period, using remote sensing and geographic information system (SIG) data. The recorded regression was estimated at 2,21 %. Description: Algerian journal of arid environment 2021-06-30T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/27348 Titre: DIVERSITÉ PHÉNOTYPIQUE ET PROPRIÉTÉS PGPR DES RHIZOBIA NODULANT L'ARACHIDE (Arachis hypogaea L.) CULTIVÉE DANS LES SOLS SABLEUX ALGÉRIENS Auteur(s): KRAIMAT Mohamed; DJANI Halima; MEHAYA El Alia; HADJ MAHAMMED Imane; BOUKHLIFA Lyna Koufaila; BENBITOUR Imane; OULED HADJ AISSA Meriem; HADJ AMMAR Sara; BENSAHA Samira; OULED HEDDAR Meriem; BISSATI Samia Résumé: In order to assess phenotypic variability of native rhizobia nodulating peanut (Arachis hypogaea L.), a collection of fourteen isolates obtained from effective root nodules of peanut, cultivated in two potential regions of Algeria (Sebseb and EL Mansoura), was subjected to phenotypic characterization using morphological, biochemical and physiological tests. Some Plant Gowth Promoting Rhizobacteria (PGPR) properties had also been investigated in this study for each strain. Furthermore, a representative strain (M044713), forming a separate cluster in the UPGMA dendrogram of API 20NE tests was chosen for phylogenetic analysis using 16S rRNA gene. The results showed that most of bacterial isolates are Gram-negative bacilli. They can be divided into slow-growing and fast-growing rhizobia. Their responses to the various tests as well as their PGPR characteristics were interesting, but variable. The phylogenetic distribution of the isolate M044713, based on 16S rRNA sequence analysis, revealed low similarity percentages with all strains previously isolated from peanut and the most important percentage of similarity was 94.5%, noted with Pseudoxanthomonas koreensis species Description: Algerian journal of arid environment 2021-06-30T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/27347 Titre: SOURCES DE COMPENSATION EN EAU DE L'ARGANERAIE Argania spinosa L. AU SAHARA OUEST ALGÉRIEN Auteur(s): KECHAIRI Réda Résumé: The Argan tree Argania spinosa L. is a major sylvopastoral component in the Algerian Western Sahara (Tindouf) in North West Africa. It grows in the rocky plateau “Hamada” of the Saharan desert. It is located in along the wadi beds, on sandy, rocky and gravelly substrates. It turns out that the region of Argan grove is characterized by extreme climatic conditions and a dry period that extends all year round. Under the severe aridity conditions the Argan tree adapts well on the hydrography of Hamada of Tindouf in the presence of underflows, where additional water supply is accumulated below the substrate of dry wadis beds. Description: Algerian journal of arid environment 2021-06-30T00:00:00Z