Morphological and molecular characterization of ‘Saragolla’ wheats (Triticum turgidum subsp. durum from Abruzzo, Italy)

Abstract

A morphological and genetic characterization of autochthonous ‘Saragolla’ wheats, currently cultivated in Abruzzo Region (Italy), was carried out. Using 15 simple sequence repeat (SSR) markers and 24 UPOV morphological traits we compared: (a) 13 ‘Saragolla’ genotypes with traits of the italicum/apulicum botanical varieties (Saragolla (Sar.) italicum), (b) 26 ‘Saragolla’ genotypes with traits of leucurum/affine botanical varieties (Sar. leucurum), (c) 8 breeding varieties (pure lines), and (d) 5 Italian autochthonous wheats and 1 turanicum line (old wheats). One hundred twenty-six (126) alleles were identified. The number of alleles per locus spanned from 4 to 15 and the number of alleles per genotype varied between 12 and 21. Values of gene diversity (Nei) across the 53 genotypes was 0.17. The groups of Sar. leucurum and Sar. italicum genotypes were morphologically distinguishable from the groups of old wheats and pure lines. Likewise, the analysis of molecular data using the discriminant analysis revealed that genotypes with the Sar. italicum phenotype displayed distinct genetic differences from Sar. leucurum, pure lines and old wheats. These results make Sar. italicum genotypes distinguishable and eligible as a conservation variety. Ward's clustering analysis of the 53-genotype pool showed that the ‘Saragolla’ landrace is a valuable repository of genetic diversity.

Keywords

• Abruzzo Region
• 'Saragolla' landrace
• durum wheat diversity
• genetic characterization