Articles

COMBINING DEFICIT IRRIGATION STRATEGIES AND CONTROLLED ATMOSPHERE TO MAINTAIN BIOACTIVE COMPOUNDS IN NECTARINE

Article number
1012_6
Pages
97 – 102
Language
English
Abstract
Mediterranean agricultural systems are characterized by shortage of water and the low quality of the available resources.
Therefore, the crops cultivation should be based on deficit irrigation strategies (DI). The effect of DI on total phenolic contents, antioxidant capacity and vitamin C changes of ‘Viowhite 5’ nectarines was studied.
Three irrigation treatments were implemented: control, watered at 100% of crop evapotranspiration (ETc); over-irrigated, watered at 120% of Etc; and DI, watered as the control, except during two most critical periods (fruit growth and postharvest phases), when the tree was irrigated at 60 and 80% of control, respectively.
After harvest, fruits were stored up to 14 days at 0-1°C and 95% RH in air or in controlled atmosphere (CA; 3-4 kPa O2 and 12-14 kPa CO2), followed by 3 days at 15°C in air (simulating a retail sale period). The ranges of total phenolic contents (in mg/100 g fresh weight) were 53 to 62 (initial), 56 to 66 (after 14 days) and 44 to 58 (14+3 days). Fruits from DI stored under CA reached the highest total phenolic levels after 14 and 14+3 days.
DI fruits kept their initial antioxidant capacity throughout the storage (57.27±0.45 mg AA/100 g fw), while in control and over-irrigated the antioxidant capacity gradually decreased (from 66 to 52 mg AA/100 g fw). Concerning vitamin C (ascorbic + dehydroascorbic acids – AA + DHA), AA was transformed into DHA during storage and the DHA content was higher in CA-stored fruits than in those air stored (15 vs. 10 mg/100 g fw). In addition, DI fruits reached higher AA and DHA than those from the other treatments, followed by over-irrigated and control nectarines.
As main conclusion, DI cultivation allowed important water saving and provided nectarines with good quality after chilling storage both in air or in CA.

Publication
Authors
N. Falagán, E. Aguayo, F. Artés-Hernández, F. Artés, P.A. Gómez, M.E. Peña-Estévez, M. Corbalán
Keywords
Prunus persica, phenolic contents, antioxidant capacity, vitamin C, quality
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