Genetic determinism of the vegetative and reproductive traits in an F1 olive tree progeny : Evidence of tree ontogeny effect

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...

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Bibliographic Details
Published in:Tree genetics & genomes 2013-02, Vol.9 (1), p.205-221
Main Authors: Ben Sadok, I, Moutier, N, Garcia, G, Dosba, F, Grati-Kamoun, N, Rebai, A, Khadari, B, Costes, E
Format: Article
Language:English
Subjects:
Adaptation
agronomic traits
Architecture
asexual reproduction
Biomedical and Life Sciences
Biotechnology
branching
Breeding
covariance
Decomposition
Determinism
Flowering
Forestry
Fruit trees
fruiting
Fruits
Genetic crosses
Genetic factors
Genomes
genotype
Genotypes
Heritability
Life Sciences
new variety
Olea
olives
Ontogeny
Original Paper
Phenotyping
Plant Breeding/Biotechnology
Plant Genetics and Genomics
progeny
Quantitative genetics
quantitative traits
reproductive traits
Shoots
Structure-function relationships
Tree Biology
Trees
Variables
variance
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Summary: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.
ISSN:1614-2942
1614-2950
DOI:10.1007/s11295-012-0548-x