Agro-morphological diversity of local and international accessions of the Spanish Pear Germplasm Bank in Zaragoza
A set of 34 landraces and local accessions and 39 international reference cultivars from the Spanish Pear Germplasm Bank in Zaragoza (Spain) was agro-morphologically characterized based on 50 Bioversity International and UPOV descriptors (24 quantitative and 26 qualitative) in order to evaluate the agro-morphological variability of the Spanish germplasm, identify the most relevant differences with the international reference cultivars and group the accessions according to their agro-morphological distances. The correlation analysis between the 24 quantitative descriptors revealed few significant correlations, four positive (leaf blade length-leaf blade width, season of ripening-fruit size, russet around eye basin-russet on cheeks and russet on cheeks-russet around stalk) and one negative (leaf blade width-ratio length/with). The traits showing the highest phenotypic variability were fruit size, fruit firmness, fruit acidity, leaf distance from the stipules to the petiole base and length of leaf pointed tip. As a whole, the Spanish accessions were more precocious in flowering and ripening time than the international reference group, showed a bigger flower petal size, a smaller fruit size, a more rounded fruit shape, less incidence of skin russet and more spreading fruit attitude of sepals. The dendrogram obtained from the agro-morphological distances do not group the accessions according to their geographical origin; nevertheless, a small group of seven Spanish cultivars (Don Guindo, L-3.2.10, Duquesa Barreda, Limón de Verano, Malacara, Tocinera and Magallón) showed a higher distance to the rest of accessions included in the study.
Espiau Ramírez, M.T. and Alonso Segura, J.M. (2021). Agro-morphological diversity of local and international accessions of the Spanish Pear Germplasm Bank in Zaragoza. Acta Hortic. 1303, 71-78
Pyrus communis, genetic resources, agro-morphological characterization