Articles
EVALUATION OF SELECTED EUROPEAN CHESTNUT (CASTANEA SATIVA) PROVENANCES – II: INTRA-PROVENANCE FAMILY VARIATION
Article number
866_25
Pages
215 – 224
Language
English
Abstract
The performance and variability of 143 open-pollinated families of Castanea sativa from six natural contrasting European chestnut populations were investigated.
After four years of out-planting, growth and morphological traits were studied for three consecutive years at the Taxiarchis provenance-progeny trial located in Greece.
The experimental design was a complete randomized block design with single-tree plots with 3 × 3 m spacing in 10 replicates.
Notable variation was revealed both among and within families for height, diameter, index volume and number of leaves.
Age × family interaction was not significant indicating some families were stable in their ranking at different ages, suggesting that early selection between families may be effective.
No particular trend could be associated with an age regarding estimates of the coefficient of variation (CVA) and individual, family and within family heritabilities.
The genotypic variance components accounted for up to 8.1% for diameter, 8.5% for height, 7.5% for volume and 5.2% for number of leaves.
Four selection methods: individual, family, within family, and combined were used to estimate genetic gain.
It reached 25% for diameter, 28% for height, 68% for volume and 49% for number of leaves, in a scheme of 10% selection across selection methods and ages.
Combined selection for volume consistently had the highest genetic gain.
After four years of out-planting, growth and morphological traits were studied for three consecutive years at the Taxiarchis provenance-progeny trial located in Greece.
The experimental design was a complete randomized block design with single-tree plots with 3 × 3 m spacing in 10 replicates.
Notable variation was revealed both among and within families for height, diameter, index volume and number of leaves.
Age × family interaction was not significant indicating some families were stable in their ranking at different ages, suggesting that early selection between families may be effective.
No particular trend could be associated with an age regarding estimates of the coefficient of variation (CVA) and individual, family and within family heritabilities.
The genotypic variance components accounted for up to 8.1% for diameter, 8.5% for height, 7.5% for volume and 5.2% for number of leaves.
Four selection methods: individual, family, within family, and combined were used to estimate genetic gain.
It reached 25% for diameter, 28% for height, 68% for volume and 49% for number of leaves, in a scheme of 10% selection across selection methods and ages.
Combined selection for volume consistently had the highest genetic gain.
Publication
Authors
D.T. Tchatchoua, F.A. Aravanopoulos
Keywords
provenance, growth traits, survival, genetic variation
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