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| Author: | W.S. Kim |
Abstract:
Jonathan spot like symptom (JSLS) and bitter pit like symptom (BPLS) were observed on the fruit skin of ‘Jonathan’ apples which were induced by more supply of Mg powder at 3 weeks before harvest.
JSLS was different to Jonathan spot and bitter pit by sophisticated diagnosis.
Mg content of the fruit was higher as much as 1,161 ppm in fruit skin than that of not symptomed, 785 ppm.
To predict Ca deficiency in fruit before harvest, 0.1M MgCl2 + 0.3M sorbitol + 0.1 % Tween 20 were infiltrated to ‘Tsugaru’ and ‘Fuji’ apples.
BPLS of ‘Tsugaru’ and ‘Fuji’ was initiated AP 30 days and 20 days before harvest time.
The highest % BPLS of ‘Tsugaru’ was recorded as much as 80 % at 20 days before harvest, however ‘Fuji’ showed less sensitive responses than that of ‘Tsugaru’. According to Mg infiltration of ‘Tsugaru’ apples, Mg contents in fruit skin were increased to 1,218ppm in BPLS fruit and 809ppm in not symptomed fruit.
To control Ca deficiency in fruit CaCl2 solution was infiltrated for 10 minutes after harvest.
Infiltration with 4% CaCl2+0.3% xanthan gum increased the Ca contents as much as 550ppm in comparison to control, 358ppm in fruit skin. %bitter pit of ‘Tsugaru’ was 1.2% in CaCl2+xanthan gum, and 19.7% in control at 15 days after treatment in cold storage room (4 °C).
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