บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Ripeness of shaded and sun-exposed apples (Malus domestica).

Klein, J. D., Dong Li, Zhou HongWei and Lurie, S.

ISHS Acta Horticulturae 553: 95-98.

2001

บทคัดย่อ

Ripeness of shaded and sun-exposed apples (Malus domestica).

The effect of preharvest temperatures in the orchard during commercial harvest on ripeness characteristics of shaded and sun-exposed apple fruits was investigated in Israel [date not given]. A recording thermocouple and an external collection apparatus were attached to individual fruits to measure temperature and ethylene and carbon dioxide production on the tree. Sun-exposed apples were 5-10 deg C warmer than shaded fruit, and had a diurnal pattern of both ACC and ethylene production with a mid-day peak. Shaded apples produced 80-90% less ethylene than sun-exposed fruits. The respiration (CO2 production) in both exposed and shaded fruits was lowest in the morning and increased during the day. At harvest, exposed fruits were firmer and had higher soluble solids than shaded apples. These differences diminished when fruits were kept for 10 days at 20 deg C after harvest. The diurnal temperature flux in the orchard hastened some ripeness parameters (ethylene production and soluble solids accumulation) while delaying softening. The transient heat stress that sun-exposed apples experienced in the orchard was not the same as the postharvest heat treatment that delayed ripening.