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Comparison of Fruit Characteristics of 'Fuji'/M.26 in Response to Ethephon Treatment and Combined Treatment of Ethephon and CaCl2 During Maturing Stages

Ethephon 단용처리와 Ethephon 및 염화칼슘 혼합처리에 따른 사과 'Fuji'/M.26의 성숙기 과실특성 비교

  • Sewon Oh (Division of Animal, Horticultural, and Food Sciences, Chungbuk National University) ;
  • Seong Ho Moon (Department of Horticulture, Chungbuk Agriculture Meister College) ;
  • Keum-Il Jang (Department of Food Science and Biotechnology, Chungbuk National University) ;
  • Junsoo Lee (Department of Food Science and Biotechnology, Chungbuk National University) ;
  • Daeil Kim (Department of Horticultural Science, Chungbuk National University)
  • 오세원 (충북대학교 축산.원예.식품공학부) ;
  • 문성호 (충북농업마이스터대학 원예학과) ;
  • 장금일 (충북대학교 식품생명공학과) ;
  • 이준수 (충북대학교 식품생명공학과) ;
  • 김대일 (충북대학교 원예과학과)
  • Received : 2023.07.21
  • Accepted : 2023.08.03
  • Published : 2023.10.01

Abstract

The harvest time of the late-ripening 'Fuji' apple (Malus × domestica) is variable, depending on the coloration of the fruit skin. Ethephon, a plant growth regulator, promotes the ethylene production and induces physiological responses associated with fruit maturation in climacteric fruit crops, such as apples. This study aimed to investigate the effect of ethephon treatment on fruit characteristics after fruit enlargement, with the objective of proposing an economical and stable harvest control method for 'Fuji'/M.26 apples. Fruit characteristics were assessed at 10-days intervals following the application of 100 mg/L ethephon and mixture of 100 mg/L ethephon and 0.5% CaCl2 at 145 days after full bloom (DAFB). Starch contents of ethephon-treated (ET) and ethephon with CaCl2-treated (EC) apples began to decrease from 155 DAFB, and the starch contents of ET and EC at 10 days before harvest were similar to those of control at harvest time. Red coloration of fruit skin in EC was lower compared to ET but higher than control. The average fruit firmness was low in ET, while the control and EC exhibited similar levels of firmness. Fruit sugar acid ratios did not show significant differences between treatments. However, the titratable acidity of EC was significantly lower than that of the control at 10 days before harvest. Moreover, fruit sugar acid ratio of ET and EC at 10 days before harvest in 2021 was similar to their sugar acid ratio at harvest time. Therefore, it was thought that fruit maturation and skin coloration could be accelerated by 10 days from the harvest time through the combined treatment of 100 mg/L ethephon and 0.5% CaCl2 at the end of fruit enlargement in 'Fuji'/M.26.

만생종 'Fuji' 사과(Malus × domestica)는 과피 착색에 따라 수확시기가 가변적인 품종이다. Ethephon은 ethylene 발생을 촉진하는 식물생장조절제로 사과나무를 포함한 호흡급등형 과수작물의 과실 성숙과 관련된 생리적 반응을 유도한다. 본 연구는 'Fuji'/M.26 사과의 경제적이고 안정적인 수확기 조절 방법을 제시하고자 과실 비대생장 종료 후 ethephon 단용처리와 ethephon 및 염화칼슘 혼합처리가 과실특성에 미치는 영향을 조사하였다. 과실 비대생장이 종료된 만개 후 145일에 100 mg/L ethephon과 100 mg/L ethephon 및 0.5% 염화칼슘 혼합용액을 분무처리 후 10일 주기로 과실특성을 조사하였다. Ethephon 단용처리구와 ethephon 및 염화칼슘 혼합처리구 모두 만개 후 155일부터 전분함량이 감소되어 과실성숙이 촉진되었으며, 수확 10일 전 전분함량은 대조구의 수확기 전분함량과 유사하였다. 과피 착색은 ethephon 및 염화칼슘 혼합처리구에서 ethephon 단용처리구보다 착색률이 낮았으나 대조구보다는 높았다. 과실 평균 경도는 ethephon 단용처리구가 가장 낮았으며, ethephon 및 염화칼슘 혼합처리구는 대조구와 유사하였다. 수확기 당산비는 세 처리구 간에 유의한 차이는 없었으나 수확 10일 전 ethephon 단용처리구와 ethephon 및 염화칼슘 혼합처리구의 적정산도가 대조구보다 유의적으로 낮았다. 특히 2021년 수확 10일 전 ethephon 단용처리구와 ethephon 및 염화칼슘 혼합처리구의 당산비는 수확기 당산비와 유사하였다. 따라서 'Fuji'/M.26의 과실 비대생장이 종료된 시점에 100 mg/L ethephon과 0.5% 염화칼슘 혼합처리를 통해 과실성숙과 과피 착색을 수확기보다 10일 촉진할 수 있을 것으로 생각된다.

Keywords

Acknowledgement

본 논문은 농촌진흥청 연구사업(과제번호: PJ015285)의 지원에 의해 이루어진 것임.

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