Changes of Fruit Quality and Reduction of Physiological Disorders during Shelf-life in Early-season Pear (Pyrus pyrifolia Nakai) Fruits Treated with Aminoethoxyvinylglycine

Abstract

조생종 배 '한아름' 및 '원황'의 상온유통 중 품질유지 및 생리장해 경감을 목적으로 aminoethoxyvinylglycine(AVG)를 0, 75, 150, <TEX>$300mg{\cdot}L^{-1}$</TEX> 농도로 수확 전 30일에 살포 처리하였다. AVG 처리는 농도에 관계없이 수확기 과실중에 영향을 미치지 않았고 전분함량, 가용성고형물, 산함량 등 수확기 품질요인에 큰 영향을 미치지 않았는데 '한아름'에 있어 <TEX>$300mg{\cdot}L^{-1}$</TEX> AVG 처리는 수확기 경도가 다소 높게 조사되었다. '한아름'에 있어 상온유통 중 과실 경도의 유지효과는 <TEX>$300mg{\cdot}L^{-1}$</TEX> 농도에서만 나타났고 '원황'의 경우에는 상온유통 21일에 AVG <TEX>$150mg{\cdot}L^{-1}$</TEX> 처리구가 27.7N, <TEX>$300mg{\cdot}L^{-1}$</TEX> 처리구가 28.2N으로 무처리구의 17.8N에 비하여 유의하게 경도가 높게 유지되었다. AVG 처리에 따른 상온유통 기간 중 과피색택 차이는 두 품종 모두 나타나지 않았다. AVG 처리는 <TEX>$300mg{\cdot}L^{-1}$</TEX> 처리구에서 상온유통 중 에틸렌발생 및 호흡률을 유의하게 낮추었으며 동 처리농도에서 과육갈변, 과심갈변, 분질현상 등 과실의 생리장해 발생을 유의하게 경감하는 효과를 보였다. 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 <TEX>$300mg{\cdot}L^{-1}$</TEX>) 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 <TEX>$300mg{\cdot}L^{-1}$</TEX> AVG were higher than that of control in 'Hanareum' pear. Among the three AVG concentrations, only <TEX>$300mg{\cdot}L^{-1}$</TEX> 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 <TEX>$150mg{\cdot}L^{-1}$</TEX> AVG (27.7 N) and <TEX>$300mg{\cdot}L^{-1}$</TEX> AVG (28.2 N) when compared with untreated control (17.8 N) during 21 days of shelf-life at <TEX>$25^{\circ}C$</TEX>. 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 <TEX>$300mg{\cdot}L^{-1}$</TEX> 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 <TEX>$300mg{\cdot}L^{-1}$</TEX> AVG in two cultivars when we compared with the untreated control.