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Plasticity in Vegetative Growth over Contrasted Growing Sites of an F1 Olive Tree Progeny during Its Juvenile Phase.

Ben Sadok I, Martinez S, Moutier N, Garcia G, Leon L, Belaj A, De La Rosa R, Khadari B, Costes E - PLoS ONE (2015)

Bottom Line: Despite strong environmental effect on most traits, no GxE was found.Moreover, the internal structure of traits co-variation was similar in both sites.Considering the determinant role of this trait in tree architecture and its stability across environments, this study consolidates its relevance for breeding.

View Article: PubMed Central - PubMed

Affiliation: Institut National de la Recherche Agronomique, UMR Amélioration Génétique et Adaptation des Plantes méditerranéennes et tropicales, Campus Cirad, Montpellier, France; Montpellier SupAgro, UMR Amélioration Génétique et Adaptation des Plantes méditerranéennes et tropicales, Campus Cirad, Montpellier, France; Institut de l'olivier de Sfax, Sfax, Tunisie; Université des sciences de Sfax, Sfax, Tunisie.

ABSTRACT
Climatic changes impact fruit tree growth and severely limit their production. Investigating the tree ability to cope with environmental variations is thus necessary to adapt breeding and management strategies in order to ensure sustainable production. In this study, we assessed the genetic parameters and genotype by environment interaction (GxE) during the early tree growth. One hundred and twenty olive seedlings derived from the cross 'Olivière' x 'Arbequina' were examined across two sites with contrasted environments, accounting for ontogenetic trends over three years. Models including the year of growth, branching order, environment, genotype effects, and their interactions were built with variance function and covariance structure of residuals when necessary. After selection of a model, broad sense heritabilities were estimated. Despite strong environmental effect on most traits, no GxE was found. Moreover, the internal structure of traits co-variation was similar in both sites. Ontogenetic growth variation, related to (i) the overall tree form and (ii) the growth and branching habit at growth unit scale, was not altered by the environment. Finally, a moderate to strong genetic control was identified for traits at the whole tree scale and at internode scale. Among all studied traits, the maximal internode length exhibited the highest heritability (H2 = 0.74). Considering the determinant role of this trait in tree architecture and its stability across environments, this study consolidates its relevance for breeding.

No MeSH data available.


Related in: MedlinePlus

Ontogenetic trends in E1 and E2 environments.Ontogenetic trends illustrated by mean values and standard deviation of the number of nodes per growth unit (GU) and GU average length (cm) as a function of years (1st, 2nd and 3rd years of growth) and branching orders (0 to 6), calculated on ‘Olivière’ x ‘Arbequina’ progeny in the two environments (Montpellier: E1 and Cordoba: E2) considered.
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pone.0127539.g001: Ontogenetic trends in E1 and E2 environments.Ontogenetic trends illustrated by mean values and standard deviation of the number of nodes per growth unit (GU) and GU average length (cm) as a function of years (1st, 2nd and 3rd years of growth) and branching orders (0 to 6), calculated on ‘Olivière’ x ‘Arbequina’ progeny in the two environments (Montpellier: E1 and Cordoba: E2) considered.

Mentions: At GUs scale, no significant correlation was observed between consecutive years or branching orders for all GUs variables (data not shown). Even though variances were heterogeneous, the models selected did not include a variance function, except for the maximal internode length for which a power of covariate variance function was taken into account in the residual term of the model (IN_Max; Table 2). The GxE interaction was not significant for all studied variables (neither geometrical nor topological variables) and was thus excluded according to BIC criteria (Table 2). The GUs length (Lsqrt) was significantly impacted by the effect of both environment and branching order factors, but not by the year effect. Basically, GUs length was higher in E1 than in E2 (Table 3) and decreased with higher branching orders (Fig 1).


Plasticity in Vegetative Growth over Contrasted Growing Sites of an F1 Olive Tree Progeny during Its Juvenile Phase.

Ben Sadok I, Martinez S, Moutier N, Garcia G, Leon L, Belaj A, De La Rosa R, Khadari B, Costes E - PLoS ONE (2015)

Ontogenetic trends in E1 and E2 environments.Ontogenetic trends illustrated by mean values and standard deviation of the number of nodes per growth unit (GU) and GU average length (cm) as a function of years (1st, 2nd and 3rd years of growth) and branching orders (0 to 6), calculated on ‘Olivière’ x ‘Arbequina’ progeny in the two environments (Montpellier: E1 and Cordoba: E2) considered.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4465673&req=5

pone.0127539.g001: Ontogenetic trends in E1 and E2 environments.Ontogenetic trends illustrated by mean values and standard deviation of the number of nodes per growth unit (GU) and GU average length (cm) as a function of years (1st, 2nd and 3rd years of growth) and branching orders (0 to 6), calculated on ‘Olivière’ x ‘Arbequina’ progeny in the two environments (Montpellier: E1 and Cordoba: E2) considered.
Mentions: At GUs scale, no significant correlation was observed between consecutive years or branching orders for all GUs variables (data not shown). Even though variances were heterogeneous, the models selected did not include a variance function, except for the maximal internode length for which a power of covariate variance function was taken into account in the residual term of the model (IN_Max; Table 2). The GxE interaction was not significant for all studied variables (neither geometrical nor topological variables) and was thus excluded according to BIC criteria (Table 2). The GUs length (Lsqrt) was significantly impacted by the effect of both environment and branching order factors, but not by the year effect. Basically, GUs length was higher in E1 than in E2 (Table 3) and decreased with higher branching orders (Fig 1).

Bottom Line: Despite strong environmental effect on most traits, no GxE was found.Moreover, the internal structure of traits co-variation was similar in both sites.Considering the determinant role of this trait in tree architecture and its stability across environments, this study consolidates its relevance for breeding.

View Article: PubMed Central - PubMed

Affiliation: Institut National de la Recherche Agronomique, UMR Amélioration Génétique et Adaptation des Plantes méditerranéennes et tropicales, Campus Cirad, Montpellier, France; Montpellier SupAgro, UMR Amélioration Génétique et Adaptation des Plantes méditerranéennes et tropicales, Campus Cirad, Montpellier, France; Institut de l'olivier de Sfax, Sfax, Tunisie; Université des sciences de Sfax, Sfax, Tunisie.

ABSTRACT
Climatic changes impact fruit tree growth and severely limit their production. Investigating the tree ability to cope with environmental variations is thus necessary to adapt breeding and management strategies in order to ensure sustainable production. In this study, we assessed the genetic parameters and genotype by environment interaction (GxE) during the early tree growth. One hundred and twenty olive seedlings derived from the cross 'Olivière' x 'Arbequina' were examined across two sites with contrasted environments, accounting for ontogenetic trends over three years. Models including the year of growth, branching order, environment, genotype effects, and their interactions were built with variance function and covariance structure of residuals when necessary. After selection of a model, broad sense heritabilities were estimated. Despite strong environmental effect on most traits, no GxE was found. Moreover, the internal structure of traits co-variation was similar in both sites. Ontogenetic growth variation, related to (i) the overall tree form and (ii) the growth and branching habit at growth unit scale, was not altered by the environment. Finally, a moderate to strong genetic control was identified for traits at the whole tree scale and at internode scale. Among all studied traits, the maximal internode length exhibited the highest heritability (H2 = 0.74). Considering the determinant role of this trait in tree architecture and its stability across environments, this study consolidates its relevance for breeding.

No MeSH data available.


Related in: MedlinePlus