บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Using volatile emissions and chlorophyll fluorescence as indicators of heat and freezing injury in apple fruits.

J. Song, L. Fan, C.F. Forney and M.A. Jordan

ISHS Acta Horticulturae 553: 245-248.

2001

บทคัดย่อ

Using volatile emissions and chlorophyll fluorescence as indicators of heat and freezing injury in apple fruits.

Volatile emissions and chlorophyll fluorescence were investigated as signals of freezing and heat injury for apple (Malus domestica) fruits. Apple cultivars McIntosh, Cortland, Northern Spy, and Jonagold were held at -8.5 deg C for 0, 6, 12 or 24 h (freezing treatments), or at 46 deg C for 0, 4, 8 or 12 h (heat treatments). Following treatments, fruit were kept at 20 deg C and evaluated after 1, 2, 4, and 7 days. Heat and freezing treatments induced volatiles such as ethanol, acetaldehyde, ethyl acetate, butanol, hexanol and ethyl-related esters. The 12 and 24 h freezing and the 8 and 12 h heat treatments increased ethanol and ethyl acetate production in all 4 cultivars by as much as 170- and 30-fold, respectively, one day after treatments. These treatments also reduced ethylene production and chlorophyll fluorescence. Freezing for 24 h and heat for 12 h caused serious flesh browning. Among the cultivars investigated, Northern Spy and McIntosh were the most sensitive to freezing and heat stress based on internal injury. The degree of increase in stress-induced volatile emissions such as ethanol and decrease in chlorophyll fluorescence correlated with severity of stress-induced injury.