Articles
GENETIC DIVERSITY AND RELATIONSHIPS AMONG ITALIAN AND SPANISH HAZELNUT CULTIVARS
Article number
845_14
Pages
127 – 132
Language
English
Abstract
The currently cultivated hazelnut varieties were selected over centuries from the germplasm of the European hazelnut (Corylus avellana L.), a species naturally widespread in Europe and western Asia.
Many of them were selected locally from the germplasm but some were recognized as superior varieties and were spread outside the area of origin by trade and migration.
In spite of the long domestication history, still little is known about the genetic structure and background of the cultivars.
In this work, 22 Italian and 36 Spanish accessions from various germplasm repositories were studied at 16 microsatellite markers in order to study: (1) the genetic diversity of the Italian cultivars and (2) their genetic relationships with Spanish cultivated varieties.
The analysis of SSR data showed a high level of genetic diversity among Italian cultivars.
A radial tree generated by UPGMA cluster analysis grouped the 22 Italian cultivars according to their geographical origins.
Genetic relationships among 58 Italian and Spanish cultivars were assessed using three indexes: 1-proportion of shared alleles, δμ (delta mu), and fuzzy set similarity. Dendrograms obtained by UPGMA cluster analysis showed that cultivars from South Italy, except Tonda Bianca and Tonda Rossa, always resulted closely related with the same group of Spanish varieties.
The cultivars from Liguria region were separated from the Spanish accessions, while the position of Tonda Gentile delle Langhe and Tonda Gentile Romana was controversial.
Many of them were selected locally from the germplasm but some were recognized as superior varieties and were spread outside the area of origin by trade and migration.
In spite of the long domestication history, still little is known about the genetic structure and background of the cultivars.
In this work, 22 Italian and 36 Spanish accessions from various germplasm repositories were studied at 16 microsatellite markers in order to study: (1) the genetic diversity of the Italian cultivars and (2) their genetic relationships with Spanish cultivated varieties.
The analysis of SSR data showed a high level of genetic diversity among Italian cultivars.
A radial tree generated by UPGMA cluster analysis grouped the 22 Italian cultivars according to their geographical origins.
Genetic relationships among 58 Italian and Spanish cultivars were assessed using three indexes: 1-proportion of shared alleles, δμ (delta mu), and fuzzy set similarity. Dendrograms obtained by UPGMA cluster analysis showed that cultivars from South Italy, except Tonda Bianca and Tonda Rossa, always resulted closely related with the same group of Spanish varieties.
The cultivars from Liguria region were separated from the Spanish accessions, while the position of Tonda Gentile delle Langhe and Tonda Gentile Romana was controversial.
Publication
Authors
P. Boccacci, D. Torello Marinoni, R. Botta, M. Rovira
Keywords
SSR, microsatellite, Corylus avellana, characterization, germplasm
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