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KMID : 0903619910320040469
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Journal of the Korean Society for Horticultural Science
1991 Volume.32 No. 4 p.469 ~ p.477
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Effects of Calcium Salts on Offsetting the Stimulation of Ripening and Softening by Fenoprop in ´ Tsugaru ´ Apple Fruits
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Abstract
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This experiment was conducted to determine the effect of calcium salts on offsetting the stimulation of ripening and softening induced by fenoprop in ´Tsugaru´ apple fruits. The results were summerized as follows.
1. The coloration and maturity of ´Tsugaru´ apples occurred to be as early as about 2 weeks by fenoprop spray. Calcium acetate at the concentration of 2.2, 4.4 or 8.8 g per liter combined with fenoprop offset the stimulation of maturity induced by fenoprop alone and this supression was strengthened along with the increase of calcium concentration, whereas calcium chloride appeared to be little effective.
2. Calcium hydroxide of 4.4 or 8.8 g per liter used together with fenoprop effectively delayed the stimulation of maturity induced by fenoprop alone but seemed to be less effective than calcium acetate of the respective concentrations.
3. Fenoprop enhanced 1-aminocyclopropane-1-carboxylic acid(ACC) synthesis, ethylene evolution, and ethylene forming enzyme (EFE) activity. Both calcium acetate and calcium hydroxide when sprayed with fenoprop significantly reduced the synthesis of ACC synthesis, ethylene evolution, and EFE activity.
4. Spraying of calcium acetate of 8.8 g/ℓ alone did not affect the coloration and ripening of fruits.
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