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KMID : 0903619960370010081
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Journal of the Korean Society for Horticultural Science
1996 Volume.37 No. 1 p.81 ~ p.86
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Effect of Postharvest Calcium Infiltration on Firmness , Pectin content and Occurrence of botryosphaeria dothidea in Apple Fruits
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Abstract
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Apple fruits were infiltrated with calcium chloride after harvest, and then changes in flesh firmness, pectic substance, and calcium content were determined, and also the effect of calcium on cell wall structure and pathogenesis were investigated. Calcium contents in peel and flesh of apple fruits were remarkably increased by postharvest calcium infiltration. The flesh firmness was highly maintained in calcium-treated apples compared with those of untreated fruits during storage. Calcium-treated fruits showed high contents of total, insoluble and EDTA-soluble pectic substances, whereas they showed low water soluble pectin than untreated fruits. The cell wall of calcium-treated fruits was obviously maintained with middle lamella region but that of untreated fruits was separated each other by its dissolution. After storage for 6 months, the incidence of rotten apples in 4% calcium chloride-treated fruits decreased to three-folds than that of untreated fruits. Lesion diameters on 4% calcium chloridetreated apples decreased to 8.7∼12.5 ㎜, more than 40io of 17.219.8 ㎜ on untreated apples, as results of wound inoculation with Botryosphaeria dothidea.
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