Department of Horticulture, Chungnam National University1
Pear Research Station, National Institute of Horticultural & Herbal Science2
Foundation of University-Industry Research Collaboration, Paichai University3
We investigated the effect of preharvest spray of aminoethoxyvinylglycine (AVG) on the fruit quality and incidence of physiological disorders during shelf-life of ‘Hanareum’ and ‘Wonhwang’ pear (Pyrus pyrifolia Nakai). AVG applications (0, 75, 150 and 300 mg･L-1) made 30 days before anticipated harvest of respective cultivar. AVG did not influence the fruit development and quality parameters including starch content, soluble solids and acidity at harvest time in two pear cultivars although the flesh firmness of the fruits treated with 300 mg･L-1 AVG were higher than that of control in ‘Hanareum’ pear. Among the three AVG concentrations, only 300 mg･L-1 AVG showed effectiveness on maintaining flesh firmness in ‘Hanareum’ pear during shelf-life. Meanwhile, competitive high flesh firmness was attained in ‘Wonhwang’ pear treated with 150 mg･L-1 AVG (27.7 N) and 300 mg･L-1 AVG (28.2 N) when compared with untreated control (17.8 N) during 21 days of shelf-life at 25°C. AVG did not cause any significant difference at skin color development relative to control in two pear cultivars. AVG decreased ethylene production and respiration rate at 300 mg･L-1 level in two pear cultivars during the entire shelf-life. During shelf-life, low incidence of physiological disorders including internal and core browning and mealiness were attained in the fruits treated at 300 mg･L-1 AVG in two cultivars when we compared with the untreated control.
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