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Evelyne Costes - One of the best experts on this subject based on the ideXlab platform.
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Genetic Determinism of the vegetative and reproductive traits in a F1 olive tree Progeny: evidence of tree ontogeny effect
Tree Genetics and Genomes, 2013Co-Authors: Ines Ben Sadok, Nathalie Moutier, Bouchaib Khadari, Francoise Dosba, Gilbert Garcia, N. Grati-kamoun, A. Rebai, Evelyne CostesAbstract:The agronomic performance of fruit trees is significantly influenced by tree internal organization. Introducing architectural traits in breeding programs could thus lead to select new varieties with a regular bearing and lower input demand in order to reduce training and environmental costs. However, an interaction between tree ontogeny and Genetic factors is expected. In this study, we investigated the Genetic Determinism of architectural traits in the olive tree, accounting for tree development over 5 years until first flowering occurrence. We studied an F1 progeny issued from a cross between two contrasted genotypes, ‘Olivière’ and ‘Arbequina’. Tree architecture was decomposed in quantitative traits, related to (1) growth and branching, (2) first flowering and fruiting. Models, including the year of growth, branching order and genotype effects, were built with variance function and covariance structure when necessary. After a model selection, broad sense heritabilities were calculated. During the first 3 years, both the mean values of vegetative traits and Genetic factor significance depended on the shoot within-tree position. Dependencies between consecutive years were revealed for traits related to whole tree form. Whole tree form variables showed medium to high broad sense heritability values, whereas reproductive traits were highly heritable. This study demonstrates the existence of ontogenic trends in the olive tree, which result in traits heritable only at the tree periphery. A phenotyping strategy adapted to its architectural characteristics and a list of relevant traits, such as maximal internode length, is proposed. Transgressive effects suggest that Genetic progress could be performed in future selection programs.
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Genetic Determinism of the vegetative and reproductive traits in an F1 olive tree progeny : Evidence of tree ontogeny effect
Tree Genetics & Genomes, 2012Co-Authors: I. Ben Sadok, Nathalie Moutier, Bouchaib Khadari, Francoise Dosba, Gilbert Garcia, N. Grati-kamoun, A. Rebai, Evelyne CostesAbstract:The agronomic performance of fruit trees is significantly influenced by tree internal organization. Introducing architectural traits in breeding programs could thus lead to select new varieties with a regular bearing and lower input demand in order to reduce training and environmental costs. However, an interaction between tree ontogeny and Genetic factors is expected. In this study, we investigated the Genetic Determinism of architectural traits in the olive tree, accounting for tree development over 5 years until first flowering occurrence. We studied an F1 progeny issued from a cross between two contrasted genotypes, ‘Oliviere’ and ‘Arbequina’. Tree architecture was decomposed in quantitative traits, related to (1) growth and branching, (2) first flowering and fruiting. Models, including the year of growth, branching order and genotype effects, were built with variance function and covariance structure when necessary. After a model selection, broad sense heritabilities were calculated. During the first 3 years, both the mean values of vegetative traits and Genetic factor significance depended on the shoot within-tree position. Dependencies between consecutive years were revealed for traits related to whole tree form. Whole tree form variables showed medium to high broad sense heritability values, whereas reproductive traits were highly heritable. This study demonstrates the existence of ontogenic trends in the olive tree, which result in traits heritable only at the tree periphery. A phenotyping strategy adapted to its architectural characteristics and a list of relevant traits, such as maximal internode length, is proposed. Transgressive effects suggest that Genetic progress could be performed in future selection programs.
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Studying the Genetic Determinism of olive tree architecture in a F1 progeny Oliviere x Arbequina
Acta Horticulturae, 2012Co-Authors: Ines Ben Sadok, Nathalie Moutier, Bouchaib Khadari, Evelyne Costes, Francoise DosbaAbstract:Tree architecture is of major importance for the agronomic performance of fruit tree orchards. It influences tree adaptability to cultivations systems, but also yields and fruit quality. In the present study, we aim at investigating the Genetic Determinism of architectural traits in the olive tree. A F1 hybrid population was created between two genotypes with contrasted architectures, ‘Olivière’ and ‘Arbequina’. A phenotyping methodology was applied to analyze traits related to growth, branching and fruiting behaviour, that were measured during the first 4 years of tree growth. Taking into account the influence of tree ontogeny, the phenotypic variability was decomposed into genotypic and residual effects in order to identify the most heritable characters. Topological and geometrical variables showed relatively low to medium broad sense heritability values. The highest heritability values were found for the number of internodes and short laterals per growth unit, and the mean internodes length with H2 value greater than 0.5. Flowering variables showed high heritability values exceeding 0.6. A first QTL (quantitative trait loci) was detected for the number of lateral inflorescences, on the basis of a framework Genetic map constructed with 44 SSR loci and 494 AFLP markers.
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Deciphering the Genetic Determinism of bud phenology in apple progenies: a new insight into chilling and heat requirement effects on flowering dates and positional candidate genes.
The New phytologist, 2011Co-Authors: Jean-marc Celton, Sébastien Martinez, M.j. Jammes, A. Bechti, S. Salvi, Jean-michel Legave, Evelyne CostesAbstract:Summary •The present study investigates the Genetic Determinism of bud phenological traits using two segregating F1 apple (Malus × domestica) progenies. •Phenological trait variability was dissected into Genetic and climatic components using mixed linear modeling, and estimated best linear unbiased predictors were used for quantitative trait locus (QTL) detection. For flowering dates, year effects were decomposed into chilling and heat requirements based on a previously developed model. •QTL analysis permitted the identification of two major and population-specific genomic regions on LG08 and LG09. Both ‘chilling requirement’ and ‘heat requirement’ periods influenced flowering dates, although their relative impact was dependent on the Genetic background. Using the apple genome sequence data, putative candidate genes underlying one major QTL were investigated. Numerous key genes involved in cell cycle control were identified in clusters within the confidence interval of the major QTL on LG09. •Our results contribute towards a better understanding of the interaction between QTLs and climatic conditions, and provide a basis for the identification of genes involved in bud growth resumption.
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Studying the Genetic Determinism of olive tree architecture in a F1 progeny 'Oliviere' x 'Arbequina'
Acta Horticulturae, 2011Co-Authors: I. Ben Sadok, Nathalie Moutier, Bouchaib Khadari, Evelyne Costes, Francoise DosbaAbstract:Tree architecture is of major importance for the agronomic performance of fruit tree orchards. It influences tree adaptability to cultivations systems, but also yields and fruit quality. In the present study, we aim at investigating the Genetic Determinism of architectural traits in the olive tree. A F1 hybrid population was created between two genotypes with contrasted architectures, ‘Oliviere’ and ‘Arbequina’. A phenotyping methodology was applied to analyze traits related to growth, branching and fruiting behaviour, that were measured during the first 4 years of tree growth. Taking into account the influence of tree ontogeny, the phenotypic variability was decomposed into genotypic and residual effects in order to identify the most heritable characters. Topological and geometrical variables showed relatively low to medium broad sense heritability values. The highest heritability values were found for the number of internodes and short laterals per growth unit, and the mean internodes length with H2 value greater than 0.5. Flowering variables showed high heritability values exceeding 0.6. A first QTL (quantitative trait loci) was detected for the number of lateral inflorescences, on the basis of a framework Genetic map constructed with 44 SSR loci and 494 AFLP markers.
Andres Legarra - One of the best experts on this subject based on the ideXlab platform.
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Detection of unrecorded environmental challenges in high-frequency recorded traits, and Genetic Determinism of resilience to challenge, with an application on feed intake in lambs
Genetics Selection Evolution, 2021Co-Authors: Carolina Andrea Garcia-baccino, Didier Marcon, Christel Marie-etancelin, Flavie Tortereau, Jean-louis Weisbecker, Andres LegarraAbstract:AbstractBackgroundResilient animals can remain productive under different environmental conditions. Rearing in increasingly heterogeneous environmental conditions increases the need of selecting resilient animals. Detection of environmental challenges that affect an entire population can provide a unique opportunity to select animals that are more resilient to these events. The objective of this study was two-fold: (1) to present a simple and practical data-driven approach to estimate the probability that, at a given date, an unrecorded environmental challenge occurred; and (2) to evaluate the Genetic Determinism of resilience to such events.MethodsOur method consists of inferring the existence of highly variable days (indicator of environmental challenges) via mixture models applied to frequently recorded phenotypic measures and then using the inferred probabilities of the occurrence of an environmental challenge in a reaction norm model to evaluate the Genetic Determinism of resilience to these events. These probabilities are estimated for each day (or other time frame). We illustrate the method by using an ovine dataset with daily feed intake (DFI) records.ResultsUsing the proposed method, we estimated the probability of the occurrence of an unrecorded environmental challenge, which proved to be informative and useful for inclusion as a covariate in a reaction norm animal model. We estimated the breeding values for sensitivity of the Genetic potential for DFI of animals to environmental challenges. The level and slope of the reaction norm were negatively correlated (− 0.46 ± 0.21).ConclusionsOur method is promising and appears to be viable to identify unrecorded events of environmental challenges, which is useful when selecting resilient animals and only productive data are available. It can be generalized to a wide variety of phenotypic records from different species and used with large datasets. The negative correlation between level and slope indicates that a hypothetical selection for increased DFI may not be optimal depending on the presence or absence of stress. We observed a reranking of individuals along the environmental gradient and low Genetic correlations between extreme environmental conditions. These results confirm the existence of a G ×\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\times$$\end{document} E interaction and show that the best animals in one environmental condition are not the best in another one.
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Detection of unrecorded environmental challenges in high-frequency recorded traits, and Genetic Determinism of resilience to challenge, with an application on feed intake in lambs.
Genetics selection evolution : GSE, 2021Co-Authors: Carolina Andrea Garcia-baccino, Christel Marie-etancelin, Flavie Tortereau, D. Marcon, Jean-louis Weisbecker, Andres LegarraAbstract:BACKGROUND Resilient animals can remain productive under different environmental conditions. Rearing in increasingly heterogeneous environmental conditions increases the need of selecting resilient animals. Detection of environmental challenges that affect an entire population can provide a unique opportunity to select animals that are more resilient to these events. The objective of this study was two-fold: (1) to present a simple and practical data-driven approach to estimate the probability that, at a given date, an unrecorded environmental challenge occurred; and (2) to evaluate the Genetic Determinism of resilience to such events. METHODS Our method consists of inferring the existence of highly variable days (indicator of environmental challenges) via mixture models applied to frequently recorded phenotypic measures and then using the inferred probabilities of the occurrence of an environmental challenge in a reaction norm model to evaluate the Genetic Determinism of resilience to these events. These probabilities are estimated for each day (or other time frame). We illustrate the method by using an ovine dataset with daily feed intake (DFI) records. RESULTS Using the proposed method, we estimated the probability of the occurrence of an unrecorded environmental challenge, which proved to be informative and useful for inclusion as a covariate in a reaction norm animal model. We estimated the breeding values for sensitivity of the Genetic potential for DFI of animals to environmental challenges. The level and slope of the reaction norm were negatively correlated (- 0.46 ± 0.21). CONCLUSIONS Our method is promising and appears to be viable to identify unrecorded events of environmental challenges, which is useful when selecting resilient animals and only productive data are available. It can be generalized to a wide variety of phenotypic records from different species and used with large datasets. The negative correlation between level and slope indicates that a hypothetical selection for increased DFI may not be optimal depending on the presence or absence of stress. We observed a reranking of individuals along the environmental gradient and low Genetic correlations between extreme environmental conditions. These results confirm the existence of a G [Formula: see text] E interaction and show that the best animals in one environmental condition are not the best in another one.
Francoise Dosba - One of the best experts on this subject based on the ideXlab platform.
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Genetic Determinism of the vegetative and reproductive traits in a F1 olive tree Progeny: evidence of tree ontogeny effect
Tree Genetics and Genomes, 2013Co-Authors: Ines Ben Sadok, Nathalie Moutier, Bouchaib Khadari, Francoise Dosba, Gilbert Garcia, N. Grati-kamoun, A. Rebai, Evelyne CostesAbstract:The agronomic performance of fruit trees is significantly influenced by tree internal organization. Introducing architectural traits in breeding programs could thus lead to select new varieties with a regular bearing and lower input demand in order to reduce training and environmental costs. However, an interaction between tree ontogeny and Genetic factors is expected. In this study, we investigated the Genetic Determinism of architectural traits in the olive tree, accounting for tree development over 5 years until first flowering occurrence. We studied an F1 progeny issued from a cross between two contrasted genotypes, ‘Olivière’ and ‘Arbequina’. Tree architecture was decomposed in quantitative traits, related to (1) growth and branching, (2) first flowering and fruiting. Models, including the year of growth, branching order and genotype effects, were built with variance function and covariance structure when necessary. After a model selection, broad sense heritabilities were calculated. During the first 3 years, both the mean values of vegetative traits and Genetic factor significance depended on the shoot within-tree position. Dependencies between consecutive years were revealed for traits related to whole tree form. Whole tree form variables showed medium to high broad sense heritability values, whereas reproductive traits were highly heritable. This study demonstrates the existence of ontogenic trends in the olive tree, which result in traits heritable only at the tree periphery. A phenotyping strategy adapted to its architectural characteristics and a list of relevant traits, such as maximal internode length, is proposed. Transgressive effects suggest that Genetic progress could be performed in future selection programs.
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Genetic Determinism of the vegetative and reproductive traits in an F1 olive tree progeny : Evidence of tree ontogeny effect
Tree Genetics & Genomes, 2012Co-Authors: I. Ben Sadok, Nathalie Moutier, Bouchaib Khadari, Francoise Dosba, Gilbert Garcia, N. Grati-kamoun, A. Rebai, Evelyne CostesAbstract:The agronomic performance of fruit trees is significantly influenced by tree internal organization. Introducing architectural traits in breeding programs could thus lead to select new varieties with a regular bearing and lower input demand in order to reduce training and environmental costs. However, an interaction between tree ontogeny and Genetic factors is expected. In this study, we investigated the Genetic Determinism of architectural traits in the olive tree, accounting for tree development over 5 years until first flowering occurrence. We studied an F1 progeny issued from a cross between two contrasted genotypes, ‘Oliviere’ and ‘Arbequina’. Tree architecture was decomposed in quantitative traits, related to (1) growth and branching, (2) first flowering and fruiting. Models, including the year of growth, branching order and genotype effects, were built with variance function and covariance structure when necessary. After a model selection, broad sense heritabilities were calculated. During the first 3 years, both the mean values of vegetative traits and Genetic factor significance depended on the shoot within-tree position. Dependencies between consecutive years were revealed for traits related to whole tree form. Whole tree form variables showed medium to high broad sense heritability values, whereas reproductive traits were highly heritable. This study demonstrates the existence of ontogenic trends in the olive tree, which result in traits heritable only at the tree periphery. A phenotyping strategy adapted to its architectural characteristics and a list of relevant traits, such as maximal internode length, is proposed. Transgressive effects suggest that Genetic progress could be performed in future selection programs.
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Studying the Genetic Determinism of olive tree architecture in a F1 progeny Oliviere x Arbequina
Acta Horticulturae, 2012Co-Authors: Ines Ben Sadok, Nathalie Moutier, Bouchaib Khadari, Evelyne Costes, Francoise DosbaAbstract:Tree architecture is of major importance for the agronomic performance of fruit tree orchards. It influences tree adaptability to cultivations systems, but also yields and fruit quality. In the present study, we aim at investigating the Genetic Determinism of architectural traits in the olive tree. A F1 hybrid population was created between two genotypes with contrasted architectures, ‘Olivière’ and ‘Arbequina’. A phenotyping methodology was applied to analyze traits related to growth, branching and fruiting behaviour, that were measured during the first 4 years of tree growth. Taking into account the influence of tree ontogeny, the phenotypic variability was decomposed into genotypic and residual effects in order to identify the most heritable characters. Topological and geometrical variables showed relatively low to medium broad sense heritability values. The highest heritability values were found for the number of internodes and short laterals per growth unit, and the mean internodes length with H2 value greater than 0.5. Flowering variables showed high heritability values exceeding 0.6. A first QTL (quantitative trait loci) was detected for the number of lateral inflorescences, on the basis of a framework Genetic map constructed with 44 SSR loci and 494 AFLP markers.
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Studying the Genetic Determinism of olive tree architecture in a F1 progeny 'Oliviere' x 'Arbequina'
Acta Horticulturae, 2011Co-Authors: I. Ben Sadok, Nathalie Moutier, Bouchaib Khadari, Evelyne Costes, Francoise DosbaAbstract:Tree architecture is of major importance for the agronomic performance of fruit tree orchards. It influences tree adaptability to cultivations systems, but also yields and fruit quality. In the present study, we aim at investigating the Genetic Determinism of architectural traits in the olive tree. A F1 hybrid population was created between two genotypes with contrasted architectures, ‘Oliviere’ and ‘Arbequina’. A phenotyping methodology was applied to analyze traits related to growth, branching and fruiting behaviour, that were measured during the first 4 years of tree growth. Taking into account the influence of tree ontogeny, the phenotypic variability was decomposed into genotypic and residual effects in order to identify the most heritable characters. Topological and geometrical variables showed relatively low to medium broad sense heritability values. The highest heritability values were found for the number of internodes and short laterals per growth unit, and the mean internodes length with H2 value greater than 0.5. Flowering variables showed high heritability values exceeding 0.6. A first QTL (quantitative trait loci) was detected for the number of lateral inflorescences, on the basis of a framework Genetic map constructed with 44 SSR loci and 494 AFLP markers.
Nathalie Moutier - One of the best experts on this subject based on the ideXlab platform.
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Genetic Determinism of the vegetative and reproductive traits in a F1 olive tree Progeny: evidence of tree ontogeny effect
Tree Genetics and Genomes, 2013Co-Authors: Ines Ben Sadok, Nathalie Moutier, Bouchaib Khadari, Francoise Dosba, Gilbert Garcia, N. Grati-kamoun, A. Rebai, Evelyne CostesAbstract:The agronomic performance of fruit trees is significantly influenced by tree internal organization. Introducing architectural traits in breeding programs could thus lead to select new varieties with a regular bearing and lower input demand in order to reduce training and environmental costs. However, an interaction between tree ontogeny and Genetic factors is expected. In this study, we investigated the Genetic Determinism of architectural traits in the olive tree, accounting for tree development over 5 years until first flowering occurrence. We studied an F1 progeny issued from a cross between two contrasted genotypes, ‘Olivière’ and ‘Arbequina’. Tree architecture was decomposed in quantitative traits, related to (1) growth and branching, (2) first flowering and fruiting. Models, including the year of growth, branching order and genotype effects, were built with variance function and covariance structure when necessary. After a model selection, broad sense heritabilities were calculated. During the first 3 years, both the mean values of vegetative traits and Genetic factor significance depended on the shoot within-tree position. Dependencies between consecutive years were revealed for traits related to whole tree form. Whole tree form variables showed medium to high broad sense heritability values, whereas reproductive traits were highly heritable. This study demonstrates the existence of ontogenic trends in the olive tree, which result in traits heritable only at the tree periphery. A phenotyping strategy adapted to its architectural characteristics and a list of relevant traits, such as maximal internode length, is proposed. Transgressive effects suggest that Genetic progress could be performed in future selection programs.
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Genetic Determinism of the vegetative and reproductive traits in an F1 olive tree progeny : Evidence of tree ontogeny effect
Tree Genetics & Genomes, 2012Co-Authors: I. Ben Sadok, Nathalie Moutier, Bouchaib Khadari, Francoise Dosba, Gilbert Garcia, N. Grati-kamoun, A. Rebai, Evelyne CostesAbstract:The agronomic performance of fruit trees is significantly influenced by tree internal organization. Introducing architectural traits in breeding programs could thus lead to select new varieties with a regular bearing and lower input demand in order to reduce training and environmental costs. However, an interaction between tree ontogeny and Genetic factors is expected. In this study, we investigated the Genetic Determinism of architectural traits in the olive tree, accounting for tree development over 5 years until first flowering occurrence. We studied an F1 progeny issued from a cross between two contrasted genotypes, ‘Oliviere’ and ‘Arbequina’. Tree architecture was decomposed in quantitative traits, related to (1) growth and branching, (2) first flowering and fruiting. Models, including the year of growth, branching order and genotype effects, were built with variance function and covariance structure when necessary. After a model selection, broad sense heritabilities were calculated. During the first 3 years, both the mean values of vegetative traits and Genetic factor significance depended on the shoot within-tree position. Dependencies between consecutive years were revealed for traits related to whole tree form. Whole tree form variables showed medium to high broad sense heritability values, whereas reproductive traits were highly heritable. This study demonstrates the existence of ontogenic trends in the olive tree, which result in traits heritable only at the tree periphery. A phenotyping strategy adapted to its architectural characteristics and a list of relevant traits, such as maximal internode length, is proposed. Transgressive effects suggest that Genetic progress could be performed in future selection programs.
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Studying the Genetic Determinism of olive tree architecture in a F1 progeny Oliviere x Arbequina
Acta Horticulturae, 2012Co-Authors: Ines Ben Sadok, Nathalie Moutier, Bouchaib Khadari, Evelyne Costes, Francoise DosbaAbstract:Tree architecture is of major importance for the agronomic performance of fruit tree orchards. It influences tree adaptability to cultivations systems, but also yields and fruit quality. In the present study, we aim at investigating the Genetic Determinism of architectural traits in the olive tree. A F1 hybrid population was created between two genotypes with contrasted architectures, ‘Olivière’ and ‘Arbequina’. A phenotyping methodology was applied to analyze traits related to growth, branching and fruiting behaviour, that were measured during the first 4 years of tree growth. Taking into account the influence of tree ontogeny, the phenotypic variability was decomposed into genotypic and residual effects in order to identify the most heritable characters. Topological and geometrical variables showed relatively low to medium broad sense heritability values. The highest heritability values were found for the number of internodes and short laterals per growth unit, and the mean internodes length with H2 value greater than 0.5. Flowering variables showed high heritability values exceeding 0.6. A first QTL (quantitative trait loci) was detected for the number of lateral inflorescences, on the basis of a framework Genetic map constructed with 44 SSR loci and 494 AFLP markers.
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Studying the Genetic Determinism of olive tree architecture in a F1 progeny 'Oliviere' x 'Arbequina'
Acta Horticulturae, 2011Co-Authors: I. Ben Sadok, Nathalie Moutier, Bouchaib Khadari, Evelyne Costes, Francoise DosbaAbstract:Tree architecture is of major importance for the agronomic performance of fruit tree orchards. It influences tree adaptability to cultivations systems, but also yields and fruit quality. In the present study, we aim at investigating the Genetic Determinism of architectural traits in the olive tree. A F1 hybrid population was created between two genotypes with contrasted architectures, ‘Oliviere’ and ‘Arbequina’. A phenotyping methodology was applied to analyze traits related to growth, branching and fruiting behaviour, that were measured during the first 4 years of tree growth. Taking into account the influence of tree ontogeny, the phenotypic variability was decomposed into genotypic and residual effects in order to identify the most heritable characters. Topological and geometrical variables showed relatively low to medium broad sense heritability values. The highest heritability values were found for the number of internodes and short laterals per growth unit, and the mean internodes length with H2 value greater than 0.5. Flowering variables showed high heritability values exceeding 0.6. A first QTL (quantitative trait loci) was detected for the number of lateral inflorescences, on the basis of a framework Genetic map constructed with 44 SSR loci and 494 AFLP markers.
Bouchaib Khadari - One of the best experts on this subject based on the ideXlab platform.
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Genetic Determinism of the vegetative and reproductive traits in a F1 olive tree Progeny: evidence of tree ontogeny effect
Tree Genetics and Genomes, 2013Co-Authors: Ines Ben Sadok, Nathalie Moutier, Bouchaib Khadari, Francoise Dosba, Gilbert Garcia, N. Grati-kamoun, A. Rebai, Evelyne CostesAbstract:The agronomic performance of fruit trees is significantly influenced by tree internal organization. Introducing architectural traits in breeding programs could thus lead to select new varieties with a regular bearing and lower input demand in order to reduce training and environmental costs. However, an interaction between tree ontogeny and Genetic factors is expected. In this study, we investigated the Genetic Determinism of architectural traits in the olive tree, accounting for tree development over 5 years until first flowering occurrence. We studied an F1 progeny issued from a cross between two contrasted genotypes, ‘Olivière’ and ‘Arbequina’. Tree architecture was decomposed in quantitative traits, related to (1) growth and branching, (2) first flowering and fruiting. Models, including the year of growth, branching order and genotype effects, were built with variance function and covariance structure when necessary. After a model selection, broad sense heritabilities were calculated. During the first 3 years, both the mean values of vegetative traits and Genetic factor significance depended on the shoot within-tree position. Dependencies between consecutive years were revealed for traits related to whole tree form. Whole tree form variables showed medium to high broad sense heritability values, whereas reproductive traits were highly heritable. This study demonstrates the existence of ontogenic trends in the olive tree, which result in traits heritable only at the tree periphery. A phenotyping strategy adapted to its architectural characteristics and a list of relevant traits, such as maximal internode length, is proposed. Transgressive effects suggest that Genetic progress could be performed in future selection programs.
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Genetic Determinism of the vegetative and reproductive traits in an F1 olive tree progeny : Evidence of tree ontogeny effect
Tree Genetics & Genomes, 2012Co-Authors: I. Ben Sadok, Nathalie Moutier, Bouchaib Khadari, Francoise Dosba, Gilbert Garcia, N. Grati-kamoun, A. Rebai, Evelyne CostesAbstract:The agronomic performance of fruit trees is significantly influenced by tree internal organization. Introducing architectural traits in breeding programs could thus lead to select new varieties with a regular bearing and lower input demand in order to reduce training and environmental costs. However, an interaction between tree ontogeny and Genetic factors is expected. In this study, we investigated the Genetic Determinism of architectural traits in the olive tree, accounting for tree development over 5 years until first flowering occurrence. We studied an F1 progeny issued from a cross between two contrasted genotypes, ‘Oliviere’ and ‘Arbequina’. Tree architecture was decomposed in quantitative traits, related to (1) growth and branching, (2) first flowering and fruiting. Models, including the year of growth, branching order and genotype effects, were built with variance function and covariance structure when necessary. After a model selection, broad sense heritabilities were calculated. During the first 3 years, both the mean values of vegetative traits and Genetic factor significance depended on the shoot within-tree position. Dependencies between consecutive years were revealed for traits related to whole tree form. Whole tree form variables showed medium to high broad sense heritability values, whereas reproductive traits were highly heritable. This study demonstrates the existence of ontogenic trends in the olive tree, which result in traits heritable only at the tree periphery. A phenotyping strategy adapted to its architectural characteristics and a list of relevant traits, such as maximal internode length, is proposed. Transgressive effects suggest that Genetic progress could be performed in future selection programs.
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Studying the Genetic Determinism of olive tree architecture in a F1 progeny Oliviere x Arbequina
Acta Horticulturae, 2012Co-Authors: Ines Ben Sadok, Nathalie Moutier, Bouchaib Khadari, Evelyne Costes, Francoise DosbaAbstract:Tree architecture is of major importance for the agronomic performance of fruit tree orchards. It influences tree adaptability to cultivations systems, but also yields and fruit quality. In the present study, we aim at investigating the Genetic Determinism of architectural traits in the olive tree. A F1 hybrid population was created between two genotypes with contrasted architectures, ‘Olivière’ and ‘Arbequina’. A phenotyping methodology was applied to analyze traits related to growth, branching and fruiting behaviour, that were measured during the first 4 years of tree growth. Taking into account the influence of tree ontogeny, the phenotypic variability was decomposed into genotypic and residual effects in order to identify the most heritable characters. Topological and geometrical variables showed relatively low to medium broad sense heritability values. The highest heritability values were found for the number of internodes and short laterals per growth unit, and the mean internodes length with H2 value greater than 0.5. Flowering variables showed high heritability values exceeding 0.6. A first QTL (quantitative trait loci) was detected for the number of lateral inflorescences, on the basis of a framework Genetic map constructed with 44 SSR loci and 494 AFLP markers.
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Studying the Genetic Determinism of olive tree architecture in a F1 progeny 'Oliviere' x 'Arbequina'
Acta Horticulturae, 2011Co-Authors: I. Ben Sadok, Nathalie Moutier, Bouchaib Khadari, Evelyne Costes, Francoise DosbaAbstract:Tree architecture is of major importance for the agronomic performance of fruit tree orchards. It influences tree adaptability to cultivations systems, but also yields and fruit quality. In the present study, we aim at investigating the Genetic Determinism of architectural traits in the olive tree. A F1 hybrid population was created between two genotypes with contrasted architectures, ‘Oliviere’ and ‘Arbequina’. A phenotyping methodology was applied to analyze traits related to growth, branching and fruiting behaviour, that were measured during the first 4 years of tree growth. Taking into account the influence of tree ontogeny, the phenotypic variability was decomposed into genotypic and residual effects in order to identify the most heritable characters. Topological and geometrical variables showed relatively low to medium broad sense heritability values. The highest heritability values were found for the number of internodes and short laterals per growth unit, and the mean internodes length with H2 value greater than 0.5. Flowering variables showed high heritability values exceeding 0.6. A first QTL (quantitative trait loci) was detected for the number of lateral inflorescences, on the basis of a framework Genetic map constructed with 44 SSR loci and 494 AFLP markers.