Articles
BIOMETRICAL METHODS TO REINFORCE SELECTION EFFICIENCY IN BREEDING PROGRAMS FOR HAZELNUT (CORYLUS AVELLANA L.) CROP IMPROVEMENT
Article number
845_16
Pages
139 – 144
Language
English
Abstract
Heritability has a predictive role for determining the breeding value of the hazelnut parents using their phenotypic value; moreover, it expresses the proportion of the total variance attributable to the average effects of genes in the parents which have been transmitted to the progeny and are available for selection.
The regression of half-sib (HS) offspring compared to the mother plant from accessions of Tonda Gentile Romana, Nocchione, Tonda Gentile delle Langhe, Nociara, San Giovanni, Longue dEspagne, Sivri A, and Karidati, was used as a method to estimate heritability for the following traits: nut weight, nut width, nut shape index, seed weight, husk length and nut length of hazelnut landraces.
Nut length showed the highest and significant offspring-one parent regression coefficient.
Overall, the 46 HS-offspring plants analyzed showed larger variation than the parental plants.
The first two principal components (PC1 and PC2), that explain 39% and 29% respectively of the observed variability for the eight fruit and seed characters, indicated positive correlation of PC1 scores with the length and shape of fruits and seeds.
Therefore, the variability of fruit length and shape in the offspring, attributable to significant average effects of genes inherited from the parents, is available for screening and selection of HS-offspring plants to identify ortets to derive novel clones expressing new seed shape features.
The progeny from Longue dEspagneand Tonda Gentile Romana are the most promising for selection progress.
The regression of half-sib (HS) offspring compared to the mother plant from accessions of Tonda Gentile Romana, Nocchione, Tonda Gentile delle Langhe, Nociara, San Giovanni, Longue dEspagne, Sivri A, and Karidati, was used as a method to estimate heritability for the following traits: nut weight, nut width, nut shape index, seed weight, husk length and nut length of hazelnut landraces.
Nut length showed the highest and significant offspring-one parent regression coefficient.
Overall, the 46 HS-offspring plants analyzed showed larger variation than the parental plants.
The first two principal components (PC1 and PC2), that explain 39% and 29% respectively of the observed variability for the eight fruit and seed characters, indicated positive correlation of PC1 scores with the length and shape of fruits and seeds.
Therefore, the variability of fruit length and shape in the offspring, attributable to significant average effects of genes inherited from the parents, is available for screening and selection of HS-offspring plants to identify ortets to derive novel clones expressing new seed shape features.
The progeny from Longue dEspagneand Tonda Gentile Romana are the most promising for selection progress.
Publication
Authors
LJ. Kuzmanović, C. De Pace, E. Rugini
Keywords
heritability, parent-offspring, regression analysis, fruit shape, fruit tree breeding
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