บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Superficial scald in Jonagold as affected by harvest date and storage conditions.

Awad, M. A. G.; Jager, A. de; Roelofs, F. P. M. M.; Scholtens, A.;

Acta Horticulturae Year: 1993 Issue: No. 326 Pages: 245-249 Ref: 12 ref.

1993

บทคัดย่อ

Superficial scald in Jonagold as affected by harvest date and storage conditions.

The effects of harvest date and storage conditions at 1 deg C on the amount of scald (% scald) after 6 months of storage were studied in Jonagold apple fruits collected from 8 different orchards classified according to past occurrence of scald. Hexane extract of detached fruit peel was prepared to determine, at harvest and after removal from storage, the concentration of alpha -farnesene and trienes and the optical density at 205 nm (OD-205) as an estimate of total antioxidant activity in the peel. After storage at 3% O2 + 1% CO2 (High Oxygen Low Carbon Dioxide, HOLC) followed by 3 weeks of shelf life at 20 deg , % scald (averaged for different harvest dates) was 23%. At 1.5% O2 + 1% CO2 (LOLC) and 3% O2 + 5% CO2 (HOHC), % scald was 2% and 6%, respectively, while at 1.5% O2 + 5% CO2 (LOHC) no scald was observed. This shows that in Jonagold both O2 and CO2 affect the occurrence of scald. At HOLC % scald (39%) was significantly higher in early harvested apples compared with apples from a normal ha

rvest date (13% scald). Fruits harvested early had lower OD-205 values compared with fruits harvested at a normal date while in fruits stored at 1.5% O2, OD-205 values were higher and triene concentrations were lower compared with storage at 3% O2. alpha -Farnesene concentrations were not influenced by harvest date or storage condition. Triene concentrations at removal from storage were positively correlated with % scald after one week of shelf life (r = 0.81) in early harvested fruits at HOLC. alpha -Farnesene concentrations at removal from storage were positively correlated with % scald after 3 weeks of shelf life (r = 0.85). Correlations between % scald after storage and levels of alpha -farnesene, trienes and of OD-205 values at harvest were low.