บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Temperature induces differential softening responses in apple cultivars.

Johnston, J. W., Hewett, E. W., Hertog, M. L. A. T. M. and Harker, F. R.

Postharvest Biology and Technology, Volume 23, Number 3, December 2001 , pp. 185-196

2001

บทคัดย่อ

Temperature induces differential softening responses in apple cultivars.

Loss of firmness in apple (Malus domestica [M. pumila]) cultivars Royal Gala (RG), Cox's Orange Pippin (COP), Granny Smith (GS) and Pacific Rose (PR) was quantified in fruits held continuously at temperatures from 0 to 35 deg C. Softening was triphasic, consisting of an initial slow softening phase, followed by a rapid phase and a final slow softening phase. Loss of firmness at each temperature was described by an asymmetric, sigmoidal equation. The rate of firmness change (k) at different temperatures was described by a modified Arrhenius equation for RG and COP, where k increased with temperature from 0 through approx equal to 22 deg C, and decreased through 35 deg C. This equation did not describe k at different temperatures for GS and PR, as k was similar from 0 to 12 deg C, and could not be calculated for fruits at 20-35 deg C as rapid phase softening was not initiated. Transition between the initial slow softening phase and the rapid softening phase were related to a rapid increase in internal ethylene concentration (IEC) for all cultivars. GS and PR had slow softening at 20-35 deg C, and had delayed and slow increases in IEC. Equations used in this study could be used to estimate firmness loss at different parts of the commercial postharvest handling chain, especially where fruits are at non-optimal storage temperatures.