3 recherche sur le tag 'Variabilité'   

Cartographie de la variabilité thermique des écosystèmes forestiers de l’Est algérien. / Ahmed Laala  

Public ISBD Titre : Cartographie de la variabilité thermique des écosystèmes forestiers de l’Est algérien. Type de document : texte imprimé Auteurs : Ahmed Laala, Auteur ; Djamel Alatou, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2016 Importance : 212 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais Biologie Tags : Ecologie végétale:Ecophysiologie et biotechnologie végétale  Variabilité  Température  Forêt  NDVI  SIG  MODIS  Est algérien  Cartographie  Variability  Temperature  Forest  GIS  , Eastern Algeria  Cartography  التغيرات  الحرارة  الغابة  مؤشر الغطاء النباتي الخضري  نظام المعلومات الجغرافي  القمر الصناعي MODIS  شرق الجزائر  رسم الخرائط Index. décimale : 570 Sciences de la vie. Biologie Résumé : Algerian forest patrimony is estimated at 4 million hectares, including forests, Scrub and brush. This forest is exposed to natural and anthropogenic hazards that cause severe degradation resulting mainly in continued regressive evolution and a ubstantial loss of wealth. Among the natural threats is the climate conditions and particularly the temperature of the environment in which forest ecosystems evolve. In addition to its action on life processes, on growth and on phenology of species, temperature can change also the biogeographic areas of ecosystems. In this study we analyzed the temperature to characterize the thermal environment of eastern Algeria and the effects of its variation on the dynamics and photosynthetic activity of forest ecosystems in this vast area. The used data is the temperatures for a period of 30 consecutive years (1982-2011) and spectral index (NDVI) which can detect the photosynthetic signal above the canopy. Statistical analysis of long temperature series reveals that the warming observed worldwide is already noticed in eastern Algeria. The majority of the wilayas exposed to this hazard, where the trend is more pronounced for the annual maximum temperature, may reach 3 °C/30years, an increase of 0.1C°/year. Thus, the estimate of thermal field for each pixel in eastern Algeria was realized by using Geostatistical methods based on multiple regression between temperature and the explanatory variables describing the relief. From these spatial data, the thermal limits have been defined for each forest species. Finally, the technical of GIS and satellite images allowed us to monitor the dynamics of forest vegetation, and to build maps that define the relationship between forest biomass and thermal parameters. These maps helped us to identify 901087 hectares where trees were very sensitive to changes in the average temperature, with a percentage of 53.9% of the total area of the studied forest ecosystems. Thus, the minimum temperature affects photosynthesis of forest species in an area of 852406 ha with 50.8% of the total forest area. This cartographic expression is effective, firstly for forestry in the discrimination of forest plots where the thermal factor is the limiting factor of productivity and secondly for decision makers to define the forest management strategies of country. Diplôme : Doctorat en sciences En ligne : ../theses/biologie/LAA6983.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10412 Cartographie de la variabilité thermique des écosystèmes forestiers de l’Est algérien. [texte imprimé] / Ahmed Laala, Auteur ; Djamel Alatou, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2016 . - 212 f. ; 30 cm. 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais Biologie Tags : Ecologie végétale:Ecophysiologie et biotechnologie végétale  Variabilité  Température  Forêt  NDVI  SIG  MODIS  Est algérien  Cartographie  Variability  Temperature  Forest  GIS  , Eastern Algeria  Cartography  التغيرات  الحرارة  الغابة  مؤشر الغطاء النباتي الخضري  نظام المعلومات الجغرافي  القمر الصناعي MODIS  شرق الجزائر  رسم الخرائط Index. décimale : 570 Sciences de la vie. Biologie Résumé : Algerian forest patrimony is estimated at 4 million hectares, including forests, Scrub and brush. This forest is exposed to natural and anthropogenic hazards that cause severe degradation resulting mainly in continued regressive evolution and a ubstantial loss of wealth. Among the natural threats is the climate conditions and particularly the temperature of the environment in which forest ecosystems evolve. In addition to its action on life processes, on growth and on phenology of species, temperature can change also the biogeographic areas of ecosystems. In this study we analyzed the temperature to characterize the thermal environment of eastern Algeria and the effects of its variation on the dynamics and photosynthetic activity of forest ecosystems in this vast area. The used data is the temperatures for a period of 30 consecutive years (1982-2011) and spectral index (NDVI) which can detect the photosynthetic signal above the canopy. Statistical analysis of long temperature series reveals that the warming observed worldwide is already noticed in eastern Algeria. The majority of the wilayas exposed to this hazard, where the trend is more pronounced for the annual maximum temperature, may reach 3 °C/30years, an increase of 0.1C°/year. Thus, the estimate of thermal field for each pixel in eastern Algeria was realized by using Geostatistical methods based on multiple regression between temperature and the explanatory variables describing the relief. From these spatial data, the thermal limits have been defined for each forest species. Finally, the technical of GIS and satellite images allowed us to monitor the dynamics of forest vegetation, and to build maps that define the relationship between forest biomass and thermal parameters. These maps helped us to identify 901087 hectares where trees were very sensitive to changes in the average temperature, with a percentage of 53.9% of the total area of the studied forest ecosystems. Thus, the minimum temperature affects photosynthesis of forest species in an area of 852406 ha with 50.8% of the total forest area. This cartographic expression is effective, firstly for forestry in the discrimination of forest plots where the thermal factor is the limiting factor of productivity and secondly for decision makers to define the forest management strategies of country. Diplôme : Doctorat en sciences En ligne : ../theses/biologie/LAA6983.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10412

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Evaluation des ressources phytogénétiques des blés cultivés en Algérie et de leurs apparentés. / Ouahiba Hamdi    

Public ISBD Titre : Evaluation des ressources phytogénétiques des blés cultivés en Algérie et de leurs apparentés. : Analyse de l’expression différentielle de protéines dans le grain selon deux conditions de culture (biologique versus conventionnelle) Type de document : texte imprimé Auteurs : Ouahiba Hamdi, Auteur ; Douadi Khelifi, Directeur de thèse Editeur : Constantine : Université Mentouri Constantine Année de publication : 2011 Importance : 132 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais Biologie Tags : collections de blé  sous unités gluténines  électrophorèse  variabilité  protome  endosperme  conditions environmentales  culture conventionnelle  culture biologique  wheat collections  Glutenin subunits  electrophoresis  Variability  endosperm  environmental conditions  conventionel regime  organic regime  مجموعات من القمح  جلوتينين  تغير  الهجرة الكهربائية للبروتينات  بروتيوم  النمط الزراعي التقليدي  النمط الزراعي البيولوجي Index. décimale : 570 Sciences de la vie. Biologie Résumé : In the first part of this study, several collections were analyzed in order to appreciate the allelic variation of high and low-molecular-weight (HMW and LMW) glutenin subunits composition: a collection of 59 accessions representing 5 genomes (U, C, M, D, N), collection of 856 accessions of local durum wheat (Triticum durum Desf.) collected in Algeria and divided a priori according to their agronomical and morphological traits in 17 varieties, a collection of thirty accessions of lines sisters coming from the ICARDA, obtained from interspecific crossings between 2 Syrian varieties of durum wheat (Cham and Oum Rabi) and 2 related species (T. dicoccum and T. polonicum) and two other collections of 71 bread wheat and 120 durum wheat germoplasm grown in Algeria. Seed samples were provided for the most part by the International Center for Agricultural Research in the Dry Areas (Alep, Syria). The biochemical analysis was carried out by monodimensionel SDS-PAGE. In Aegilops collection, several new alleles corresponding to HMW subunits were detected and an allelic nomenclature was drawn up in which a total of 16 alleles were exprimed at the locus Glu-U1, 13 at Glu-M1, 9 at Glu-C1, 6 at Glu-N1 and 10 at the Glu-D1 locus. Important variation was found in the collection of botanic durum wheat. Among the 16 alleles identified at the Glu-1 loci, two were new. The first named Glu-B1i1 encoding for two bands located between 17 and 18 which was assigned the nomenclature 171 and 181. The other named Glu-B1e1 codes two bands similar to 20x and 20y but with faster mobility, which were named 20x1-20y1 and were analyzed to determine the number of thiol groups. Three and Seven cysteine residues were found respectively. At Glu-3 and Glu-2 loci, 19 alleles were identified, where the allele named Glu-B3ab (encoding for subunits 2-8-9-13-16) was considered as new. In the collection of related durum wheat, we can count six allelic forms, which two are localised at the locus Glu-A1, it acts of the allele “a” and the allele “c” and four at the locus Glu-B1, they are “a, b, d and i”. While referring to international allelic nomenclature, these alleles code for following proteins: 1, nul, 7, 7+8, 6+8 and 17+18 respectively. Important polymorphism caracterise HMW-GS with a total of 13 alleles identified.The knowledge of these alleles constitutes an important tool for the identification varietal of wheat. Extensive variation has been found in bread and durum wheat germoplasm grown in Algeria. In bread wheat 3, 6 and 5 alleles were observed at Glu-A1, Glu-B1 and Glu-D1 loci encoding HMW-GS respectively. LMW-GS displayed similar polymorphism, as 4, 9 and 3 alleles were identified at loci Glu-A3, Glu-B3 and Glu-D3 respectively. In durum wheat collection, 3 alleles were exprimeted at Glu-A1 locus and 9 at Glu-B1. At Glu-A3, Glu-B3 and Glu-B2 loci 5,8 and 2 alleles were identified. The new HMW and LMW glutenin variation found in this work suggests their possible utilisation in breeding for wheat quality. The aim of the second part of this study was to evaluate the differences due to the culture regimes (biological versus conventional) in composition of total and metabolic proteins in the mature wheat grain. The analyses were carried out on three classes of sizes of grains (small, middle and large) from two varieties of bread wheat: Ataro and Renan. The two varieties exhibited differences on the grain sizes distribution. The one-dimensional electrophoretic analyses of storage and metabolic proteins showed a significant effect of the culture regime on HMW-SG and LMW-SG for the two varieties. Many gliadins (5 bands out of 16 for Renan and 11 out of 22 for Ataro) were influenced by culture regimes. The proteomic approach, carried out on the Ataro variety, revealed for all sizes of grains, 20 variable spots of which three were more expressed in biological regime. Analysis of the proteome between sizes revealed 149 spots quantitatively different from one class to another for the biological regime, against 115 for the conventional regime. In addition to storage proteins, spectrometry analysis using MALDI-TOF and the database interrogations, allowed serpines and proteins involved in the sugars metabolism to be identified. Diplôme : Doctorat en sciences En ligne : ../theses/biologie/HAM6350.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=6320 Evaluation des ressources phytogénétiques des blés cultivés en Algérie et de leurs apparentés. : Analyse de l’expression différentielle de protéines dans le grain selon deux conditions de culture (biologique versus conventionnelle) [texte imprimé] / Ouahiba Hamdi, Auteur ; Douadi Khelifi, Directeur de thèse . - Constantine : Université Mentouri Constantine, 2011 . - 132 f. ; 30 cm. 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais Biologie Tags : collections de blé  sous unités gluténines  électrophorèse  variabilité  protome  endosperme  conditions environmentales  culture conventionnelle  culture biologique  wheat collections  Glutenin subunits  electrophoresis  Variability  endosperm  environmental conditions  conventionel regime  organic regime  مجموعات من القمح  جلوتينين  تغير  الهجرة الكهربائية للبروتينات  بروتيوم  النمط الزراعي التقليدي  النمط الزراعي البيولوجي Index. décimale : 570 Sciences de la vie. Biologie Résumé : In the first part of this study, several collections were analyzed in order to appreciate the allelic variation of high and low-molecular-weight (HMW and LMW) glutenin subunits composition: a collection of 59 accessions representing 5 genomes (U, C, M, D, N), collection of 856 accessions of local durum wheat (Triticum durum Desf.) collected in Algeria and divided a priori according to their agronomical and morphological traits in 17 varieties, a collection of thirty accessions of lines sisters coming from the ICARDA, obtained from interspecific crossings between 2 Syrian varieties of durum wheat (Cham and Oum Rabi) and 2 related species (T. dicoccum and T. polonicum) and two other collections of 71 bread wheat and 120 durum wheat germoplasm grown in Algeria. Seed samples were provided for the most part by the International Center for Agricultural Research in the Dry Areas (Alep, Syria). The biochemical analysis was carried out by monodimensionel SDS-PAGE. In Aegilops collection, several new alleles corresponding to HMW subunits were detected and an allelic nomenclature was drawn up in which a total of 16 alleles were exprimed at the locus Glu-U1, 13 at Glu-M1, 9 at Glu-C1, 6 at Glu-N1 and 10 at the Glu-D1 locus. Important variation was found in the collection of botanic durum wheat. Among the 16 alleles identified at the Glu-1 loci, two were new. The first named Glu-B1i1 encoding for two bands located between 17 and 18 which was assigned the nomenclature 171 and 181. The other named Glu-B1e1 codes two bands similar to 20x and 20y but with faster mobility, which were named 20x1-20y1 and were analyzed to determine the number of thiol groups. Three and Seven cysteine residues were found respectively. At Glu-3 and Glu-2 loci, 19 alleles were identified, where the allele named Glu-B3ab (encoding for subunits 2-8-9-13-16) was considered as new. In the collection of related durum wheat, we can count six allelic forms, which two are localised at the locus Glu-A1, it acts of the allele “a” and the allele “c” and four at the locus Glu-B1, they are “a, b, d and i”. While referring to international allelic nomenclature, these alleles code for following proteins: 1, nul, 7, 7+8, 6+8 and 17+18 respectively. Important polymorphism caracterise HMW-GS with a total of 13 alleles identified.The knowledge of these alleles constitutes an important tool for the identification varietal of wheat. Extensive variation has been found in bread and durum wheat germoplasm grown in Algeria. In bread wheat 3, 6 and 5 alleles were observed at Glu-A1, Glu-B1 and Glu-D1 loci encoding HMW-GS respectively. LMW-GS displayed similar polymorphism, as 4, 9 and 3 alleles were identified at loci Glu-A3, Glu-B3 and Glu-D3 respectively. In durum wheat collection, 3 alleles were exprimeted at Glu-A1 locus and 9 at Glu-B1. At Glu-A3, Glu-B3 and Glu-B2 loci 5,8 and 2 alleles were identified. The new HMW and LMW glutenin variation found in this work suggests their possible utilisation in breeding for wheat quality. The aim of the second part of this study was to evaluate the differences due to the culture regimes (biological versus conventional) in composition of total and metabolic proteins in the mature wheat grain. The analyses were carried out on three classes of sizes of grains (small, middle and large) from two varieties of bread wheat: Ataro and Renan. The two varieties exhibited differences on the grain sizes distribution. The one-dimensional electrophoretic analyses of storage and metabolic proteins showed a significant effect of the culture regime on HMW-SG and LMW-SG for the two varieties. Many gliadins (5 bands out of 16 for Renan and 11 out of 22 for Ataro) were influenced by culture regimes. The proteomic approach, carried out on the Ataro variety, revealed for all sizes of grains, 20 variable spots of which three were more expressed in biological regime. Analysis of the proteome between sizes revealed 149 spots quantitatively different from one class to another for the biological regime, against 115 for the conventional regime. In addition to storage proteins, spectrometry analysis using MALDI-TOF and the database interrogations, allowed serpines and proteins involved in the sugars metabolism to be identified. Diplôme : Doctorat en sciences En ligne : ../theses/biologie/HAM6350.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=6320

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خصائص ل . U.P.O.Vوالتنوع عند الحبوب ذات السيقان التبنية) :(Triticum et Hordeumمحاولة خلق تنوعية جديدة / عواطف غناي  

Public ISBD Titre : خصائص ل . U.P.O.Vوالتنوع عند الحبوب ذات السيقان التبنية) :(Triticum et Hordeumمحاولة خلق تنوعية جديدة Type de document : texte imprimé Auteurs : عواطف غناي, Auteur ; مصطفى بن لعريبي, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2019 Importance : 209 ورقة. Format : 30 سم. Note générale : Doctorat en 3 éme cycle LMD. 2نسخ موجودة مكتبة المركزية Langues : Arabe (ara) Catégories : Arabe 5 البيولوجيا Tags : cumالتنوع  التنوعية  التصالب النصف تبادلي  ASC  AGCقوة الهجينالتقنيات الحيوية، البيولوجيا والمحيط: القواعد البيولوجية للإنتاج والتنوع الحيوي النباتي  Triticum  Hordeum  Diversity  Variability  half dialel cross  GCA  SCA  Heterosis  Diversité  Variabilité  Croisement demi-diallèle  AGC  Hétérosis Index. décimale : 570 بيولوجيا Résumé : The main objective of our study, as stipulated in the title of the thesis, is to contribute methodologically to the creation of genetic variability while targeting the particular elements of parents, characters easy to distinguish in order to be able to observe them easily appear in the descendants. To do this, we started by characterizing the parental genotypes of the three species under study (T.durum Desf., T.aestivum L., H.vulgare L.) and by evaluating the morphophenological and physiological characters through the creation of descriptive sheets according to the recommendations of the U.P.O.V to know the amount of the genetic variability in order to choose the appropriate methods before to launch in improvement programs. The experiment was carried out in a glass greenhouse at the Bio-pôle of the Laboratory for the Development and Valorization of Plant Genetic Resources in Chaâb Erassas, University of the Mentouri brothers Constantine 1, for five seasons. The results obtained and related to the parents showed a significant difference between the genotypes of each species through the phenology, the descriptive sheets and the characters of production and adaptation. These results suggest that hybrids from these parents will be highly different from each other. Once this step is performed, A half-diallel crosses are undertaken between the parents judged to be better for creating a new variability and of proceed for the comparison the genetic potential of four (4) durum wheat cultivars, four (4) bread wheat and five (5) barley with their F1 hybrids as well as, the hybrid of second generation (F2) for durum wheat. The parental genotypes and their hybrids are then sown in a complete randomized blocks design with three repetitions in half-diallel following method 2 and Model 1 of Griffing (1956). The results of the first generation of each species indicated the importance of the additive and non-additive effects in the inheritance of traits under study with the preponderance of additive gene effects for the spike length with beards, the length of beard and the number of nodes per plant. The two effects of additive and nonadditive genes are equal to the of spike length in barley. The effects of additive genes were observed in heredity of the neck spike length, plant height, spike length with barbs, the length of beard, the number of spikelets per spike, the fertility of the spike and the number of grains per spike at common wheat, while controlling flag leaf area, spike length in the first generation of durum wheat and the number of nodes per plant in the second generation (F2). Non-additive gene effects were recorded for the rest of the traits studied. The parents Rihane 03 and Akhrash of barley, TSI \ VEE and Florence aurore of bread wheat and Djeneh - Khataifa, Guemgoum Rekham in durum wheat have recorded in F1the best significant values for general combining ability (GCA) for some characters of production and adaptation. The same observation was noted in F2 for the same genotypes of durum wheat. It is therefore suggested to use these parents in cereal breeding programs because of their ability to inherit these traits from to their descendants. Several hybrids record positive values of specific combining ability (SCA) due to additive X additive genetic interaction and present the highest values of heterosis in F1. These are the hybrids Akhrash x Beecher10, Jaidor x Akhrash in the barley, TSI \ VEE X Mexipak in bread wheat and Djeneh-Khetaifa x Guemgoum Rekham in durum wheat. The value of heterosis decreases certainly in F2, but remains in favor of the hybrid Djeneh –Khetaifa x Guemgoum Rekham. While the F2 generation of hybrids Béliouni x Guemgoum Rekham and Béliouni X Djeneh –Khetaifa are distinguished by the highest positive values of specific combining ability and a important heterosis effects. These hybrids can be adopted as new genotypes inheriting the traits of production and adaptation, hence the interest of continuing their selection in isolated generations to reach pure lines cultivated in fixed varieties. The study of heritability in the narrow sense showed strong values in half of the characters studied for barley and in thirteen (13) traits of common wheat and four (4) traits for durum wheat in the first generation and one trait for the second generation, while, heritability values in the broad sense are high for most traits studied in the three species. Keyword : Triticum, Hordeum, Diversity, Variability , half dialel cross, GCA, SCA, Heterosis. Diplôme : Doctorat En ligne : ../theses/biologie/AGHE4389.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11180 خصائص ل . U.P.O.Vوالتنوع عند الحبوب ذات السيقان التبنية) :(Triticum et Hordeumمحاولة خلق تنوعية جديدة [texte imprimé] / عواطف غناي, Auteur ; مصطفى بن لعريبي, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2019 . - 209 ورقة. ; 30 سم. Doctorat en 3 éme cycle LMD. 2نسخ موجودة مكتبة المركزية Langues : Arabe (ara) Catégories : Arabe 5 البيولوجيا Tags : cumالتنوع  التنوعية  التصالب النصف تبادلي  ASC  AGCقوة الهجينالتقنيات الحيوية، البيولوجيا والمحيط: القواعد البيولوجية للإنتاج والتنوع الحيوي النباتي  Triticum  Hordeum  Diversity  Variability  half dialel cross  GCA  SCA  Heterosis  Diversité  Variabilité  Croisement demi-diallèle  AGC  Hétérosis Index. décimale : 570 بيولوجيا Résumé : The main objective of our study, as stipulated in the title of the thesis, is to contribute methodologically to the creation of genetic variability while targeting the particular elements of parents, characters easy to distinguish in order to be able to observe them easily appear in the descendants. To do this, we started by characterizing the parental genotypes of the three species under study (T.durum Desf., T.aestivum L., H.vulgare L.) and by evaluating the morphophenological and physiological characters through the creation of descriptive sheets according to the recommendations of the U.P.O.V to know the amount of the genetic variability in order to choose the appropriate methods before to launch in improvement programs. The experiment was carried out in a glass greenhouse at the Bio-pôle of the Laboratory for the Development and Valorization of Plant Genetic Resources in Chaâb Erassas, University of the Mentouri brothers Constantine 1, for five seasons. The results obtained and related to the parents showed a significant difference between the genotypes of each species through the phenology, the descriptive sheets and the characters of production and adaptation. These results suggest that hybrids from these parents will be highly different from each other. Once this step is performed, A half-diallel crosses are undertaken between the parents judged to be better for creating a new variability and of proceed for the comparison the genetic potential of four (4) durum wheat cultivars, four (4) bread wheat and five (5) barley with their F1 hybrids as well as, the hybrid of second generation (F2) for durum wheat. The parental genotypes and their hybrids are then sown in a complete randomized blocks design with three repetitions in half-diallel following method 2 and Model 1 of Griffing (1956). The results of the first generation of each species indicated the importance of the additive and non-additive effects in the inheritance of traits under study with the preponderance of additive gene effects for the spike length with beards, the length of beard and the number of nodes per plant. The two effects of additive and nonadditive genes are equal to the of spike length in barley. The effects of additive genes were observed in heredity of the neck spike length, plant height, spike length with barbs, the length of beard, the number of spikelets per spike, the fertility of the spike and the number of grains per spike at common wheat, while controlling flag leaf area, spike length in the first generation of durum wheat and the number of nodes per plant in the second generation (F2). Non-additive gene effects were recorded for the rest of the traits studied. The parents Rihane 03 and Akhrash of barley, TSI \ VEE and Florence aurore of bread wheat and Djeneh - Khataifa, Guemgoum Rekham in durum wheat have recorded in F1the best significant values for general combining ability (GCA) for some characters of production and adaptation. The same observation was noted in F2 for the same genotypes of durum wheat. It is therefore suggested to use these parents in cereal breeding programs because of their ability to inherit these traits from to their descendants. Several hybrids record positive values of specific combining ability (SCA) due to additive X additive genetic interaction and present the highest values of heterosis in F1. These are the hybrids Akhrash x Beecher10, Jaidor x Akhrash in the barley, TSI \ VEE X Mexipak in bread wheat and Djeneh-Khetaifa x Guemgoum Rekham in durum wheat. The value of heterosis decreases certainly in F2, but remains in favor of the hybrid Djeneh –Khetaifa x Guemgoum Rekham. While the F2 generation of hybrids Béliouni x Guemgoum Rekham and Béliouni X Djeneh –Khetaifa are distinguished by the highest positive values of specific combining ability and a important heterosis effects. These hybrids can be adopted as new genotypes inheriting the traits of production and adaptation, hence the interest of continuing their selection in isolated generations to reach pure lines cultivated in fixed varieties. The study of heritability in the narrow sense showed strong values in half of the characters studied for barley and in thirteen (13) traits of common wheat and four (4) traits for durum wheat in the first generation and one trait for the second generation, while, heritability values in the broad sense are high for most traits studied in the three species. Keyword : Triticum, Hordeum, Diversity, Variability , half dialel cross, GCA, SCA, Heterosis. Diplôme : Doctorat En ligne : ../theses/biologie/AGHE4389.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11180

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