Peach is a dynamic crop in terms of breeding. The central area of Santa Fe, Argentina, constitutes a transition zone between temperate and subtropical climate. This work aimed to evaluate the reproductive traits and internal fruit quality of twenty-five introduced low-chill peach and nectarine cultivars. The percentage of vegetative and floral budbreak, flower density and the percentage of fruit set were calculated for each cultivar. At harvest, fruit firmness, juice content, total soluble solids of the juice, and acid concentration were determined. Fruit color was also measured by determining the Hunter coordinates. Principal component analysis allowed segregating cultivars with similar properties: (i) those with reddish fruit coloration, low fruit size and fruit yield; (ii) those with high fruit yield and fruit size; (iii) those with high total soluble solid content, juiciness and ratio, and later maturation; and (iv) those with high fruit set and fruit acidity. Although cultivars can be chosen according to these characteristics, the most recommended cultivars that combined the best characteristics of fruit quality and reproductive behavior were ‘Fla 91-8c’, ‘Rojo dos’, ‘Nect 22’, ‘Tropic Snow’, ‘Hermosillo’, ‘Jubileo’, ‘Fla 1-8 bis’, and ‘Chimarrita’.

桃在育种方面是一种充满活力的作物。阿根廷圣达菲中部地区是温带和亚热带气候的过渡带。本工作旨在评价 25 个引进的低寒桃和油桃品种的繁殖性状和内部果实品质。计算每个品种的营养和花卉萌芽率、花密度和坐果率。在收获时，测定果实硬度、果汁含量、果汁的总可溶性固形物和酸浓度。水果颜色也通过确定亨特坐标来测量。主成分分析允许分离具有相似特性的品种：(i) 果实呈红色、果实大小和果实产量低的品种；(ii) 果实产量和果实大小高的；(iii) 总可溶性固形物含量高、多汁度和比例高、成熟晚的；(iv) 坐果和果酸度高的。虽然可以根据这些特性选择品种，但最推荐结合果实品质和繁殖行为最佳特性的品种是'Fla 91-8c'、'Rojo dos'、'Nect 22'、'Tropic Snow'、'Hermosillo '、'禧年'、'Fla 1-8 bis' 和 'Chimarrita'。