A new introgression line collection to improve 'Piel de Sapo' melons
Melon (Cucumis melo) is an economically important species worldwide with a large number of cultivars displaying an impressive phenotypic and genotypic variation. However, only a fraction of this variability is exploited in modern breeding. Among those, 'Piel de sapo' (PS) market class cultivar (belonging to the inodorus horticultural group) is one of the most widely cultivated melons in Spain, producing non-climacteric and elliptic fruits with a green rind decorated with dark green spots, and white-to-cream, sweet, juicy flesh. In order to introduce new exotic variation into PS modern cultivars, we have developed new introgression lines (ILs) in the PS genetic background, including chromosome segments from an Asian exotic dudaim landrace (C. melo subsp. agrestis dudaim horticultural group). Dudaim melons develop small round fruits with a certain climacteric behaviour, characterized by a yellow rind with ochre stripes, a non-sweet, white flesh, and a complex aromatic profile, that results in a sweet fragrance. Successive backcross and selfed generations were genotyped with a set of SNPs uniformly distributed throughout the melon genome. In each generation, plants with higher recurrent genome, but representing the whole dudaim genome in the whole population, were selected. Fruit quality traits were assessed, and quantitative trait loci (QTL) involved in rind and flesh color, climacteric ripening, aroma, fruit shape and size were found. Some of the observed phenotypes could be interesting for the development of new PS types, which may contribute to the diversification of this market class.
Castro, G.E., Perpiñá, G., Esteras, C., Monforte, A.J. and Picó, M.B. (2017). A new introgression line collection to improve 'Piel de Sapo' melons. Acta Hortic. 1151, 81-86
Cucumis melo, QTL, dudaim, quality traits