scientific publication and books
Permanent URI for this collection
Browse
Recent Submissions
Item Water resources and their management under impact of climate change and users pressures in Kebir-West River basin (North-Eastern Algeria), using the WEAP model(researchgate, 2017) Tarek DAIFALLAH; Halimi SamiaAbstract Water is the factor of the humanity development, this resource of life threatened by human pressure and the effects of the nature to know the future climate change put the man in face of challenges for a rational management. The objective of this paper is to examine the likely impacts of a climate change on the water supply and demand and the resulting socioeconomic implications in the watershed of El Kebir West located in the northeast of Algeria under different scenarios applying the WEAP model. or an optimistic scenario of reference, the water resources of the basin could perfectly cover the requirements of different users. To that taking into account the impacts of climate change on these reserves, and the augment in the demand induced by the increase of populations and their activities, the region will suffer from water stress from the Horizon 2030, when demand exceeds 80 MCM of water and reach more than 136 MCM in 2050. Whereas, the supply will decrease from 70.8 actually to 66 MCM (million cubic meter) in 2050. This could be caused by a possible decrease in the storage of water. This stress could be avoided if we decide to a policy for the demand management, or may establish a state of balance of supply and demand by various tools of water management.Item Assessment of groundwater salinity and risk of soil degradation in Quaternary aquifer system. Example: Annaba plain, Algeria N-E(JOURNAL OF WATER AND LAND DEVELOPMENT, 2018) Tarek DAIFALLAH; Samia HALIMIAbstract Quality of water resources in Annaba plain (North East) of Algeria is facing a serious challenge due to industrialisation and excessive exploitation of water. Therefore, 29 groundwater samples were collected from this area to assess their hydrogeochemistry and suitability for irrigation purposes. The groundwater samples were analysed for distribution of chemical elements Ca2+, Mg2+, Na+, K+, HCO3 −, Cl−, and SO4 2−. It also includes pH, electrical conductivity. The hydrochimical study has shown that the facieses are changing between a pole calcium-chloride-sulphate and sodium-chloride types. The results also showed that the salinity is the major problem with water for irrigation use (58% of samples fall into C3S1 class). As a result, the quality of the groundwater is not suitable for sustainable crop production and soil health without appropriate remediation.Item Characterization of groundwater mineralization: Hydrochemical methods Livre(amazon, 2021-09-21) Miyada Ouanes; Belgacem HouhaThe main objective of this study is to diagnose the quality of groundwater and the impact of the F'kirina gas turbine power plant on it.10 samples were taken from boreholes and wells in the aquifer exploited in the region and used for human consumption. The results obtained showed that the water is polluted, particularly in terms of conductivity, total hardness and the concentration of minor elements. The study of the pollution parameters showed that there was an excess in the concentration of nitrates as well as sodium and sulphate. This may probably be due to the proximity of agricultural land as well as the gas turbine power plant in the case of some boreholes. To this end, ongoing assessment of water quality is deemed necessary and treatment to reduce water quality deterioration and eliminate health problems may be requiredItem Biological diversity and patrimony evaluation of the fauna and flora of a wetland of "Sebkhet el mahmel" in the arid region of Khenchela in the North-east of Algeria(Journal of Biodiversity and Environmental Sciences, 2022-04-30) Ounes Miada; Khabtane AbdelhamidAbstract The objective of our work is to determine the floristic and faunistic biological diversity and the patrimonial evaluation of the wetland of sebkhet El Mahmel in the arid zone of Khenchela located in the north east of Algeria, in order to allow the decision makers to take adequate measures for the protection and the preservation of this wetland. The results of the study reveal a remarkable floristic, faunistic and patrimonial value richness, where we inventoried 78 plant species, divided into 23 families, the majority of which are herbaceous forms including a protected species and two endemic species. As we counted 21 species of migratory water birds, divided into 6 orders grouping 8 families; dominated by the family of anatidae, all of which are protected. For the terrestrial birds we noted the presence of 35 species, divided in 07 orders containing 19 families dominated by the order of passeriformes with 11 families. For us we report the presence of 98 species; divided into 16 orders containing 44 families dominated by the order of Coleoptera with 13 families, of which 09 species are protected. As we note the presence of an order of amphibians with two families and two orders of reptiles with 05 families and 12 species, the majority of which are protected. For the mammals we noticed the presence of 14 species grouped in 06 orders containing 09 families, we point out that the area is frequented by species of important patrimonial value such as the striped hyena.Item The impact of the factory of the exploitation of the baryta deposits on the quality of the waters of the township of ain Mimoun province of Khenchela N-E of Algeria(Journal of Biodiversity and Environmental Sciences, 2022-06-15) Ouanes Miyada; Houha Belgacem; Aouidane Laiche; Khabthane AbdelhamidAbstract Our work is intended as a contribution to the analysis of the effect of barium factory discharges in the region of Ain Mimoun in the province of Khenchela, the latter has a semi-arid climate, the sampling of the groundwater was carried out on quaternary and cretaceous formations for the purpose of physicochemical analysis. The hydrochemical study revealed that the concentrations of barium and sulphate are high, particularly in the samples taken near the production unit. This means that the discharge of this barite unit has a pollution impact on the groundwater of our study area.Item IMPROVEMENT OF SALT TOLERANCE IN DURUM WHEAT BY ASCORBIC ACID APPLICATION(Journal of Stress Physiology & Biochemistry, 2011-01-07) Azzedine FerchaThe main objective of this study is to examine whether exogenously applied Ascorbic acid (AsA) may enhance the salt tolerance in durum wheat (Triticum durum Desf. var. Waha). Two weeks old seedling, grown in plastic pots of 1kg, were subjected to salt stress by adding 25ml of NaCl (150mm), and treated or not with the addition of ascorbic acid (0.7 mM). Two weeks after salt stress, plants were harvested and the various measures were recorded. The effects of salt stress, in the presence and absence of vitamin C, on the leaf growth, leaf area (LA) and some physiological and biochemical changes were investigated. It was established that the application of vitamin C mitigate to variable extent the adverse effect of salt stress on plant growth, may be due, in part, to increased leaf area, improved chlorophyll and carotenoid contents, enhanced proline accumulation and decreased H2O2 content. In conclusion, we can say that treatment with ascorbic acid improve salt tolerance in durum wheat through the enhancement of multiple processes.Item To study ways to add a phosphorus on vegetative growth of wheat plants growing under conditions of Algeria(AGRICULTURE AND BIOLOGY JOURNAL OF NORTH AMERICA, 2013) Azzedine FerchaABSTRACT Then a field experiment in two consecutive seasons on a farm in the Division lead to study the effectiveness of the added phosphorus spraying on the leaves and compare them added to the ground on the vegetative growth of wheat plants under conditions of Algeria, where you use three factors for phosphorus P0 - Ps - Pr (without adding phosphorus - affixed to the ground - added spray), respectively. and massage at 50 parts / million P2O5 on the image of super phosphate, and then added in two 3 / 2 amount by the Agriculture mixing with the soil and 3 / 1 the remainder after 15 days of agriculture, was also used phosphorus spraying on the leaves concentration of 1% of the sodium phosphate mono NaHPO4 three periods after 30 - 35 - 40 days of agriculture, and selected two types of soil differ in physical and chemical characteristics, results showed the following: Increased the dry weight of shoot significantly by adding phosphorus to any of the methods for the treatment of comparison, regardless of the type of soil The addition of phosphorus in any of the methods to increase the number of leaves and the back in both two soil in the two phases of growth. The addition of phosphorus to the ground to the significant increase in total dry weight of roots and surpassed the values of dry weight of both shoots and roots in the soil of the first region than those in the soil of Talha. - The mutual influence between the two variables is statistically significantIncreased the total content of phosphorus in shoot dry any of the methods although the added Ground surpassed Added spraying on the leaves, but the same trend was observed for the dry weight of roots.Item differential response of durum wheat genotypes to salinity A. Fercha1*, H. Gherroucha2(Journal of Applied Botany and Food Quality, 2013) Azzedine FerchaSummary This study aims to investigate the importance of accumulation of osmoprotectants and activities of some key antioxidant enzymes in genotypic variation (GV) observed among durum wheat genotypes in response to increasing NaCl salinity (0-200 mmol/L) at seedling stage. Germination and seedling growth traits of all the genotypes were significantly decreased by salinity. Mohamed Ben Bachir, the more salt-tolerant genotype, exhibited the lowest reduction in final germination percentage (FGP, <18%) and seedling growth (<60%, based on dry biomass), the lowest increase in proline (PRO) and water soluble carbohydrates contents but the highest increase in catalase (CAT) and ascorbate peroxidase (APX) activities. Correlation and principal components analysis revealed that the most important variables distinguishing salt tolerant vs. salt non-tolerant genotypes were root to shoot ratio (R/S, 36.1%), CAT (30.6%), APX (12.5%) and FGP (5.74%). Although PRO and WSC could play a key role in salt tolerance by mediating osmotic adjustment, these compounds do not seem to be significantly involved in genotypic variation (GV) for salinity tolerance in durum wheat.Item Comparative analysis of metabolic proteome variation in ascorbate-primed and unprimed wheat seeds during germination under salt stress(elsevier, 2014-05-21) Azzedine FerchaSeed priming with ascorbic acid improves salt tolerance in durum wheat. For understanding the potential mechanisms underlying this priming effect a gel-free shotgun proteomic analysis was performed comparing unprimed to ascorbate-primed wheat seed during germination under saline and non-saline conditions. Since seed germination is the result of interplay or cross-talk between embryo and embryo-surrounding tissues, we studied the variation of metabolic proteome in both tissues separately. 167 of 697 identified and 69 of 471 identified proteins increase or decrease in abundance significantly in response to priming and/or salinity compared to untreated, unstressed control in embryo and embryo-surrounding tissues, respectively. In untreated wheat embryo salt stress was accompanied by change in 129 proteins, most of which are belonging to metabolism, energy, disease/defense, protein destination and storage categories. Ascorbate pretreatment prevents and counteracts the effects of salinity upon most of these proteins and changes specifically the abundance of 35 others proteins, most of which are involved in metabolism, protein destination and storage categories. Hierarchical clustering analysis revealed three and two major clusters of protein expression in embryo and embryosurrounding tissues, respectively. This study opens promising new avenues to understand priming-induced salt tolerance in plants. Biological significance To clearly understand how ascorbate-priming enhance the salt tolerance of durum wheat during germination, we performed for the first time a comparative shotgun proteomic analysis between unprimed and ascorbate-primed wheat seeds during germination under saline and non-saline conditions. Furthermore, since seed germination is the result ofItem Shotgun proteomic analysis of soybean embryonic axes during germination under salt stress(Proteomics, 2016-03-08) Azzedine FerchaSeed imbibition and radicle emergence are generally less affected by salinity in soybean than in other crop plants. In order to unveil the mechanisms underlying this remarkable salt tolerance of soybean at seed germination, a comparative label-free shotgun proteomic analysis of embryonic axes exposed to salinity during germination sensu stricto (GSS) was conducted. The results revealed that the application of 100 and 200 mmol/L NaCl stress was accompanied by significant changes (>2-fold, P<0.05) of 97 and 75 proteins, respectively. Most of these salt-responsive proteins (70%) were classified into three major functional categories: disease/defense response, protein destination and storage and primarymetabolism. The involvement of these proteins in salt tolerance of soybean was discussed, and some of them were suggested to be potential salttolerant proteins. Furthermore, our results suggest that the cross-protection against aldehydes, oxidative as well as osmotic stress, is the major adaptive response to salinity in soybean.Item ANALYSEMULTIVARIÉE DES TRAITS ASSOCIÉS À LA VIGUEUR DES SEMENCES DE BLÉ DUR SOUS CONDITIONS SALINES(Lebanese Science Journal, 2018) Azzedine FerchaABSTRACT Azzedine Fercha, Ayache Laabassi, Tarek Aissani, Chouki Sahraoui, Mahmoud Ghaoui. 2018. Multivariate analysis of traits associated with durum wheat seed vigor under saline conditions. Lebanese Science Journal, 19(2): 123-134. In this study, the ability of germination, seedlings emergence and salt stress tolerance in durum wheat (Triticum durum Desf.) were evaluated by multivariate analysis using eight cultivars collected from different regions of Algeria. Two-way ANOVA indicated significant effects of "salt stress" and "genotype" on all the attributes of germination and seedlings growth. The principal component analysis indicated that the first and second components accounted for about 64.5 % of the variation among the traits analyzed. The second component included the coleoptiles length, seedlings length and vigor index, and accounted for nearly 60 % of the variation. This component represented the ability of wheat seedlings to grow under salt stress conditions. The hierarchical cluster analysis classified the eight genotypes into two groups. Results obtained suggested that selection for high values of the traits such as "coleoptiles length", ‘seedlings length’ and "seeds vigor" did improve salt tolerance of durum wheat. In addition, the cross between the genotypes classified in groups I and II may increase the genetic diversity in this species, and enable efficient selection among the progeny obtained from these crosses. RÉSUMÉ Azzedine Fercha, Ayache Laabassi, Tarek Aissani, Chouki Sahraoui, Mahmoud Ghaoui. 2018. Analyse multivariée des traits associés à la vigueur des semences de blé dur sous conditions salines. Journal Scientifique Libanais, 19(2): 123-134. La variabilité génétique de la tolérance à la salinité au stade germination/levée de huit génotypes de blé dur (Triticum durum Desf.) a été évaluée à l’aide d’une analyse multivariée. L’ANOVA a indiqué des effets significatifs des facteurs « stress salin » et « génotype » sur tous les attributs de germination et d’établissement des semis. L’analyse en composantes principales a indiqué que les deux premières composantes représentent environ 64.5 % de la variation totale. La deuxième composante comprend la longueur des coléoptiles, la longueur des plantules et l’indice de vigueur des semences avec ~60 % de contribution. Cette composante représente la capacité d’émergence des plantules sous stress salin. L’analyse hiérarchique a permis de classer les huit variétés en deux groupes. Ces résultats suggèrent que la sélection pour des valeurs élevées des traits comme ‘longueur des coléoptiles’, ‘longueur des plantules’ et ‘vigueur des semences’ va améliorer la tolérance à la salinité chez le blé dur. Ceci indique que les croisements entre les génotypes des deux groupes peuvent augmenter la diversité génétique de cette espèce et permettre une sélection efficace dans la progéniture obtenue à partir de ces croisements.Item Chemical composition and biological activities of Algerian Santolina africana essential oil(elsevier, 2019-05-20) Azzedine Fercha; Azzeddine Zeraiba b s t r a c t The chemical composition and the biological activities of the essential oil (EO) extracted by hydrodistillation from the aerial parts of Algerian population of Santolina africana have been studied. S. Africana EO was chemically characterized by means of GC–MS. Forty-six compounds were identified representing ∼92% of the total oil. β-pinene (11.65%), ger- macrene (10.33%), 1,8-Cineole (9.46%) and sabinene (7.18%) were the major components. The EO antioxidant activity was evaluated by DPPH assay. All EO concentrations showed considerable scavenging ability on DPPH radicals (IC 50 < 1.13 mg.mL −1 ). The antibacterial screening of EO alone and in combination with three conventional antibiotics (ABs) was made by way of disc diffusion against four standard strains. The interactive effects be- tween EO and ABs were evaluated using the One-way ANOVA analysis. The results showed a remarkable antibacterial activity of S. africana EO against Staphylococcus aureus (29 mm), Escherichia coli (29.27 mm) and Bacillus subtilis (15 mm). Excluding the antagonistic effect observed with cefazolin, the combined application of S. africana EO with the other two antibiotics led to synergistic and additive effects. These findings show the potential use of S. africana EO as an interesting source of potent antioxidant and antibiotic components useful for medicine.Item Synergistic effects of Ruta montana (Clus.) L. essential oil and antibiotics against some pathogenic bacteria(Journal of Phytology, 2021-08-31) Azzedine Ferchaa; Azzeddine Zeraib; Khaled RahalABSTRACT Antibiotic resistance has been called one of the world’s most pressing public health threats. The combination of essential oils with conventional antibiotics is one of the emerging approaches that could help prevent this problem. In light of this, the present study aimed to investigate the impact of the combination of Ruta montana essential oil with conventional antibiotics on some pathogenic bacteria. The essential oil isolated by hydrodistillation was first analyzed using GC-MS then tested alone and in combination with five recommended antibiotics against three bacterial strains by the agar disc diffusion and broth micro-dilution methods. Out of forty-nine peaks, thirty-eight components were identified representing 98.17% of the total oil composition. The major components were 2-Undecanone (63.39%), 2-Nonanone (5.65%), 2-Acetoxytetradecane (4.94%), 2-Decanone (4.47%) and 2-Dodecanone (3.35%). While R. montana essential oil showed only weak antibacterial activity compared to the antibiotics tested alone, unexpectedly, the combination of RM essential oil with antibiotics remarkably increased the antibacterial activity of the antibiotics through synergistic effects in up to 70% of cases. These results suggest that combining antibiotics with essential oils, even those with low antibacterial activity, may be effective in overcoming problems caused by increasing bacterial resistance.Item Assessment of soil metallic contamination in several sites from Northeast Algeria by use of terrestrial gastropod: Cornu aspersum (O.F. Müller, 1774) (Helicidae)(researchgate, 2023-06-26) Rabah LarbaABSTRACT The study aimed to determine concentrations of some trace elements (Fe, Mn, and Pb) in soils of five sites in Northeast Algeria (Sidi Ammar, Drean, Chatt, Besbes, and El-Kala) during the spring and autumn of 2019. All of the sites were chosen due to their proximity to industrial factories. In addition, the activity of glutathione S-transferase (GST) and acetylcholinesterase (AChE), indicators of oxidative stress and neurotoxicity respectively, were measured in land snail Cornu aspersum (O.F. Müller, 1774) (Mollusca Gastropoda Helicidae) collected from all studied sites. The concentration of heavy metals in these soils decreases as follows: Fe > Mn > Pb. GST and AChE activities were found to vary between sites and by season. The highest levels of GST activity were registered during the spring at sites closest to potential sources of pollution. AChE values showed inhibition in spring as compared to autumn. In addition, the highest inhibition values were recorded at the Sidi Ammar site. These increased levels of bioindication stress responses correlated significantly with increasing metal concentration in soil samples collected at each site. The differences recorded between the sites studied are related to their level of pollution, while the seasonal variations were due to the effect of heavy metals leaching in autumn.Item Use of the land snail Helix aspersa for monitoring heavy metal soil contamination in Northeast Algeria(researchgate, 2014-04) Rabah LarbaaAbstract The objective of this study was to investigate the impact of anthropogenic activities on soil quality using the land snail Helix aspersa as a bioindicator. Soil samples and snails were collected from several sites in Northeast Algeria during the summer and winter of 2010. All of the sites were chosen due to their proximity to industrial factories – a potential source of soil pollution via heavy metal contamination. The concentration of heavy metals (Pb, Cd, Mn, and Fe) in soil samples was analyzed using atomic absorption spectrophotometry. Activity levels of glutathione S-transferase (GST) and acetylcholinesterase (AChE), indicators of oxidative stress and neurotoxicity respectively, were measured in snails collected from each site. GST and AChE activity were found to vary between sites and by season. The highest levels of GST activity were registered during the summer at sites closest to potential sources of pollution. AChE activity levels also peaked during the summer with the highest values recorded at the site in El Hadjar. These increased levels of bioindicative stress response correlated with increasing metal concentration in soil samples collected at each site.Item Diversity of the terrestrial gastropods in the Northeast Algeria: Spatial and temporal distribution(researchgate, 2013) Rabah LarbaaABSTRACT A survey of terrestrial gastropods was carried out monthly in three sites located in the Northeast Algeria (El Hadjar, Sidi Kaci, El Kala) during the period of February 2010 January 2011. The sites were chosen according to their proximity of factories and other potential sources of pollution. Totally 8463 individuals were collected and 14 species identified (12 species of snails and 2 species of slugs) belonging to six families: Milacidae, Helicidae, Subulinidae, Cochlicellidae, Enidae and Hygromiidae. Among the species identified 4 are constant: Helix aspersa (Müller, 1774), Otala lactea (Müller, 1774), Trochoidea elegans (Gmelin, 1791), Rumina decollate (Linnaeus, 1758), 3 are accessory: Helix aperta (Born, 1778), Helicella virgata (Da Costa, 1780) and Theba pisana (Müller, 1774), and 7 are accidental: Cepaea vendobonensis (Ferussac, 1821), Zebrina detrita (Müller, 1774), Dupotetia A zonata (Pallary, 1926), Cochlicella barbara (Linnaeus, 1758), Milax gagates (Draparnaud, 1801), Milax nigricans (Phillipi, 1836), Cepaea nemoralis (Linnaeus, 1758). The specific richness of the gastropod species was found to vary between sites and by season. General seasonal peak was recorded during Spring and Winter while the lowest abundance observed during Summer. Helix aspersa is the most abundant species in all prospected sites and will be used as a bioindicator of soil pollution.Item Analysis of the chromosome variation within some natural populations of subterranean clover (Trifolium subterraneum L., Fabaceae) in Algeria(Caryologia, 2019) Zahira BouzianeAbstract. Nine natural populations of subterranean clover (Trifolium subterraneum L.) coming from different eco-geographical sites of the North-East Algeria, have been stud- ied for their chromosome number and karyotype features. The study is part of the evalu- ation and valorization of plant genetic resources of fodder and pastoral interest in Alge- ria. The results of mitosis detect two groups of populations, and reveal diversity in the number among and within populations. The Algerian populations of T. subterraneum are characterized by two chromosomic formulas. The first formula (2n=2x=16m) (median), more common in most of the studied populations, is in conformity with previous reports in this species. The karyotype of these populations is symmetrical for size and form. The second (2n=2x= 18m), is detected for the first time and described as a new chro- mosomal formula in T. subterraneum. The latter is relatively more frequent than the first one and characterizes the populations coming from high altitude areas. The karyotype (2n=2x=18m) is relatively symmetrical. At the level of the two established Karyotypes, satellites are highlighted at the first pair. A variation in the size and frequency of these satellites is observed. The species exhibits regular meiotic behaviour, confirming the pres- ence of two basic chromosome numbers (x=8 and 9). The study also highlights the role of ecological factors (Altitude and Rainfall) of the originating environment of Algerian populations in the variation and evolution of chromosome numbers in T. subterraneum. The new cytogenetic data can be exploited in the taxonomy of the species in Algeria in order to select and develop this plant genetic resource in the agricultural field.Item Interactive effect of genotype and medium on microtuberization of potatoes (Solanum tuberosum L.) grown in vitro(sciendo.com, 2020) Bouziane ZahiraAbstract: This work investigates the interactive effect of six culture media and three photoperiods (darkness, 16h/8h, 8h/16h) on the microtuberization of four potato varieties (Spunta, Désirée, Kondor and Bartina). The objective is to determine the best tuberization under these growing conditions. The measured parameters which are related to the suitability of the tuberization characteristics are: the morphological aspects (shape, position) and the biometric ones (number and diameter of tubers). The obtained results permit to valorize the meristems that constitute the starting explant, and their good organogenetic skills to provide the first generation of micropropagation with healthy vitroplants in a sufficient quantity. Thus, the grown vitroplants on the medium (MS/2+BAP+COU) presented the best values which are related to the percentage of tuberization, the number of microtubercles / vitroplants and weight of tubers. Moreover, the Bartina genotype showed a remarkable superiority over its media and under a 16h/8h photoperiod except for the diameter of the tubers, where this genotype had the best diameter over the medium (MS/2+KIN) under an 8h photoperiod.Item ECOLOGICAL CHARACTERIZATION OF NATURAL HABITATS OF SOME VICIA L. SPECIES (FABACEAE) IN NORTHEASTERN ALGERIA(researchgate, 2022-06) ZAHIRA BOUZIANEAbstract Within the framework of the evaluation and development of plant genetic resources of fodder and pastoral interest in Algeria, a study was conducted on the characterization of the natural habitats corresponding to some Vicia species (Fabaceae). Following a prospecting and collection mission carried out across north-eastern Algeria (Blida, Boumerdes, Bouira, Tizi ouzou, Béjaia, Sétif), seven species were identified (Vicia sativa, Vicia disperma, Vicia monardi, Vicia narbonensis, Vicia ochroleuca, Vicia onobrychoides and Vicia lutea). Fifty (50) sites and five species were selected. For each site, three soil samples were randomly chosen. Sixteen (16) physico-chemical parameters were analysed (soil pH, conductivity, total limestone, total nitrogen, potassium, phosphorus, carbon, organic matter, C/N ratio, soil texture composition). Two (02) factors related to the topography (altitude) and climate (rainfall) of the natural habitats of the various vetches were also considered. The results of the variance analysis (anova and manova), applied to the physical and chemical characteristics of soils, indicated very highly significant variability in the majority of cases. Vetch species are adapted to soils of various textures, however, they are more frequently encountered on soils of balanced textures. Vetches are often found on soils of basic pH, less frequently on acidic or neutral soils. Many significant relationships have also been highlighted, particularly between most of the physico-chemical characteristics of the soils and some climatic and topographical factors (altitude, rainfall). The hierarchical analysis highlighted several groups of sites which confirming the observed variation. The work highlighted the wide capacity of Vicia species to adapt to different ecological conditions, particularly Vicia sativa and Vicia disperma. This work is a contribution to the conservation and enhancement of fodder legumes in Algeria, especially the endemic and rare ones, which would be threatened and endangered.Item NALYSIS OF THE MORPHOLOGICAL, PHENOLOGICAL AND BIOMETRICAL DIVERSITY IN SEVERAL ALGERIAN POPULATIONS OF TRIFOLIUM SUBTERRANEUM L. (FABACEAE)(researchgate, 2023) ZAHIRA BOUZIANEAbstract As part of the evaluation and the valorization of plant genetic resources of fodder and pastoral interest in Algeria, twentysix (26) natural populations of subterranean clover (Trifolium subterraneum L.), originating from different ecological habitats, were the subject of a morphological, phenological and biometrical study. In total, fifty (50) characteristics were considered (33 quantitative related to vegetative development, flowering, pods and 17 qualitative related to leaves, flowers and seeds). Two ecological factors (altitude and rainfall), concerning the natural habitats of the populations, were also considered. The analysis of variance highlighted the existence of significant intraspecific and inter-population variation for several traits. The Biometrical and phenological characteristics were more discriminating than qualitative ones (markers). Several significant correlations were observed between the markers and certain traits related to the reproduction and yield. Compared to the rainfall, the effect of the altitude was relatively more pronounced on the variation of certain quantitative and qualitative characteristics (seeds weight/fruiting heads weight ratio, flush intensity, crescent breadth and stem hairiness). The results of the PCA indicate a wide morpho-phenological and biometrical variation, particularly between the populations coming from the region of Guelma. The precocity, the vegetative development, the flower production and the fruiting heads weight permitted to classify the populations into three distinct groups. This study highlighted the importance of certain quantitative and qualitative characteristics in the infraspecific classification of the species T. subterraneum in Algeria and suggests that the populations collected in the Northeast of the country would correspond to the ssp. subterraneum. The diversified performances described in the Algerian populations of T. subterraneum require their preservation and valorization.