A considerable variation in the IAD values of peach and nectarine cultivars was found; such IAD values can be used as reference indexes per cultivar in future studies. Noteworthy, changes in the fi IAD index were closely correlated with changes on rmness
retention. Segregation of peach and nectarine cultivars, according to their quality and ripening characteristics, was performed. Most cultivars deteriorated quickly, evident as rapid reduction of firmness retention under shelf life conditions, apart from ‘Opsimo Naoussas’, ‘Big Top’ and ‘Royal Gem’. Great phenotypic differences in fruit quality parameters, phenolic contents and ripening behavior, among the 26 examined cultivars were monitored. Furthermore, phenolic and flavonoid contents and antioxidant capacities were differentially changed among cultivars with the progress of shelf life ripening. Cultivars with high antioxidant contents were indicated; most promptly ‘Sun Cloud’, top-producing cultivar in Greece, although it is not being cultivated in other main European peach producing countries. Interestingly, the reference nectarine cultivar ‘Big Top’, highly appreciated by the consumers due to particular pomological traits (slow softening rate, size, skin color, sweet taste), was ranked among the cultivars with the lower antioxidant potency. Further, late compared to early-season harvested cultivars, and peach compared to nectarine cultivars, tended to be characterized by higher polyphenolic contents. Such data needs to be further confirmed in successive growing seasons or with the examination of additional cultivars or lots of the same cultivar from different orchards.
พบรูปแบบมากค่า IAD ของสายพันธุ์และคะแนน ค่าของ IAD ดังกล่าวสามารถใช้เป็นดัชนีอ้างอิงต่อพันธุ์ในการศึกษาในอนาคต สำคัญ เปลี่ยนแปลงดัชนี IAD เน็ตได้อย่างใกล้ชิดสัมพันธ์กับการเปลี่ยนแปลงใน rmnessretention. Segregation of peach and nectarine cultivars, according to their quality and ripening characteristics, was performed. Most cultivars deteriorated quickly, evident as rapid reduction of firmness retention under shelf life conditions, apart from ‘Opsimo Naoussas’, ‘Big Top’ and ‘Royal Gem’. Great phenotypic differences in fruit quality parameters, phenolic contents and ripening behavior, among the 26 examined cultivars were monitored. Furthermore, phenolic and flavonoid contents and antioxidant capacities were differentially changed among cultivars with the progress of shelf life ripening. Cultivars with high antioxidant contents were indicated; most promptly ‘Sun Cloud’, top-producing cultivar in Greece, although it is not being cultivated in other main European peach producing countries. Interestingly, the reference nectarine cultivar ‘Big Top’, highly appreciated by the consumers due to particular pomological traits (slow softening rate, size, skin color, sweet taste), was ranked among the cultivars with the lower antioxidant potency. Further, late compared to early-season harvested cultivars, and peach compared to nectarine cultivars, tended to be characterized by higher polyphenolic contents. Such data needs to be further confirmed in successive growing seasons or with the examination of additional cultivars or lots of the same cultivar from different orchards.
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