บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Chlorophyll fluorescence in relation to superficial scald development in apple.

Mir, N., Wendorf, M., Perez, R. and Beaudry, R.M.

Journal of the American Society for Horticultural Science.American Volume 123, Number 5, Sept 1998. Pages 887–892.

1998

บทคัดย่อ

Chlorophyll fluorescence in relation to superficial scald development in apple.

The relationship between chlorophyll fluorescence of 'Cortland', 'Redchief Delicious', and 'Empire' apple (Malus x domestica Borkh.) fruit and the development of superficial scald was studied during 120 days of refrigerated air (RA) storage at 0 degrees C and during 7 days of poststorage holding at 22 degrees C. Minimal fluorescence (Fo), maximal fluorescence (Fm), photochemical efficiency (Fv/Fm, where Fv = Fm-Fo) and coefficient of photochemical fluorescence quenching (qp) were measured. During storage, while Fv/Fm and Fm declined in 'Cortland' and 'Redchief Delicious' fruit over time, these two measures of chlorophyll fluorescence remained stable in 'Empire' fruit. Of the three cultivars, only 'Empire' is resistant to and did not develop superficial scald. A decline in Fv/Fm preceded scald development in 'Cortland' and 'Redchief Delicious' fruit. After 30 days of storage, qp began to decrease in fruit from all three cultivars. Prestorage diphenylamine (DPA) application had no effect on Fv/Fm, Fo, and Fm and only marginally improved maintenance of qp, but completely prevented the development of superficial scald. Poststorage holding at 22 degrees C accelerated the rate of change in most fluorescence measurement. The decline in the Fv/Fm ratio and/or qp with storage time may be in response to senescence-related factors that also enhance scald susceptibility, however, Fv/Fm does not appear to be directly related to superficial scald susceptibility per se.