บทคัดย่องานวิจัย

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Changes in some odour-active compounds in paclobutrazol-treated 'Starkspur Golden' apples at harvest and after cold storage.

Rizzolo, A.; Visai, C.; Vanoli, M.;

Postharvest Biology and Technology Year: 1997 Vol: 11 Issue: 1 Pages: 39-46 Ref: 22 ref.

1997

บทคัดย่อ

Changes in some odour-active compounds in paclobutrazol-treated 'Starkspur Golden' apples at harvest and after cold storage.

Seventeen-year-old Starkspur Golden apple trees grafted on MM.111 growing in the Experimental Orchard of the University of Milan, Montanaso Lombardo, Po Valley, Italy, were treated 25 days after full bloom (DAFB) with paclobutrazol (PBZ) as a soil-drench application (3 g/tree). After 2 years, fruits were picked 158 (commercial harvest), 172 and 181 DAFB from treated and untreated (control) trees. Fruits picked at the commercial harvest date were stored in air at 2 deg C and 90% RH for 5 or 7 months. Fruits were analysed for odour-active volatiles at harvest and after storage, using either static or dynamic headspace samplings and capillary gas chromatography. The results are expressed in terms of Odour Units (Uo) in order to relate the relative importance of each compound to overall aroma. The average Uo values at harvest and after storage showed that only half of the monitored volatiles were present in concentrations great enough to contribute to overall aroma. PBZ treatment influenced the vola

tile composition at each harvest date and after 5 months' storage, changing the odour profile. Fruits from PBZ-treated trees produced no pentyl acetate and developed less hexanal and ethyl butanoate, and more butyl acetate, hexyl acetate and ethyl 2-methylbutanoate, than fruits from untreated trees. These patterns were close to those in fruits from untreated trees harvested 181 DAFB, suggesting that fruits from PBZ-treated trees have an aromatic pattern related to ripeness/overripeness at each harvest date.