Abstract
Our objective was to investigate the effect of fertilization (mineral vs. organic) and ripening stage (pre-climacteric vs. climacteric) on the emission of volatile organic compounds (VOCs) and antioxidant activity of nectarine [Prunus persica, Batsch var. nectarina (Ait) Maxim.]. The trial was carried out in 2007 in an experimental orchard of cv. Stark RedGold grafted to GF677 peach x almond hybrid planted in 2001. The trees were subjected to mineral (N, 120 kg ha -1 year -1 ) or organic (compost, 10 t DW ha -1 year -1 ) fertilization from plantation, with treatments applied 40 days after full bloom at 60% of the annual rate and in September at 40%. A fruit sample was collected every day from 22 July to 3 August. The difference in the absorbance index (I AD ) of each fruit at each sampling date was measured by visible/near infrared spectroscopy (VIS/NIRs). Fruits were sorted into two groups corresponding to two ripening stages: pre-climacteric (l AD >0.9 and flesh firmness > 50N) and climacteric (I AD <0.4 and flesh firmness <15N). The day after each sampling, two nectarines per treatment (8 per day) were sealed in a jar for 50 minutes and VOC emission was measured in overhead air samples by gaschromatographic analysis. VOCs increased from pre-climacteric to climacteric ripening stage and were higher in fruit fertilized with compost than in those treated with mineral fertilizers. Linalool, dodecane, methyl-4-decenoate, 1-decene were among the molecules increased by compost dressing. While antioxidant activity was unaffected by ripening stage and fertilization, it was higher in fruit peel than in flesh.
Published Version
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