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Effects of 1-methylcyclopropene (1-MCP) on Fruit Quality and Occurrence of Physiological Disorders of Asian Pear (Pyrus pyrifolia), 'Wonhwang' and 'Whasan', during Shelf-life

동양배 '원황' 및 '화산'의 상온유통 중 품질 및 생리장해 발생에 미치는 1-methylcyclopropene (1-MCP) 처리의 영향

  • 이욱용 (충남대학교 농업생명과학대학 원예학과) ;
  • 오경영 (충남대학교 농업생명과학대학 원예학과) ;
  • 문승주 (대전광역시 농업기술센터) ;
  • 황용수 (충남대학교 농업생명과학대학 원예학과) ;
  • 천종필 (충남대학교 농업생명과학대학 원예학과)
  • Received : 2012.02.16
  • Accepted : 2012.07.11
  • Published : 2012.10.31

Abstract

This study was conducted to investigate the effect of 1-methylcyclopropene (1-MCP) on fruit quality and incidence of physiological disorders for keeping freshness during marketing period in Asian pear (Pyrus pyrifolia Nakai) 'Wonhwang' and 'Whasan'. Fruits were treated with $1{\mu}L{\cdot}L^{-1}$ 1-MCP for 12 hours at $25^{\circ}C$, at two or three stages of ripeness as determined by days after full bloom (DAFB). Fruits were harvested at 130 and 140 DAFB in early season cultivar 'Wonhwang' and 135, 145, and 150 DAFB in mid-season cultivar 'Whasan', respectively. Fruits were stored at $25^{\circ}C$ for 21 days and measured the flesh firmness, weight loss, soluble solids, acidity, ethylene, respiration and severity of physiological disorders at week interval. 1-MCP treatment to 'Wonhwang' pears harvested at 130 and 140 DAFB effectively delayed firmness loss during storage at $25^{\circ}C$. Untreated fruits of 'Wonhwang' pears harvested at 130 DAFB showed 32.3 and 10.1N of firmness after 14 and 21 days of shelf-life at $25^{\circ}C$, respectively, while those of the 1-MCP treated fruits showed 39.4 and 33.1N during same period. In the fruits harvested at 140 DAFB, the firmness of untreated fruit was lowered to 14.8 and 6.6N after 14 and 21 days, respectively, but those of 1-MCP treated fruit were 35.0 and 33.3N, respectively. Whereas, 1-MCP treatment delayed firmness loss only in the fruit harvested late (150 DAFB) in 'Whasan' pears. Higher soluble solids content and acidity during extended shelf-life were apparent in 1-MCP treated 'Wonhwang' pears, while those of 'Whasan' pears were little changed. 'Wonhwang' pears showed a relatively high ethylene production (maximum $0.58{\mu}l{\cdot}L^{-1}$) in the fruits harvested late than early harvested one. 'Whasan' pears showed little amount of ethylene production regardless of extended shelf-life. 1-MCP treatment to 'Wonhwang' pears decreased respiration rate following shelf-life, 42 and 50% reduction were observed at 14 days of shelf-life when compared with those of untreated ones harvested at 130 and 140 DAFB, respectively. No reduction of respiration rate by the treatment of 1-MCP was detected in 'Whasan' pears which showed considerably low respiration rate compared with 'Wonhwang' pears. Harvest time influenced the level of physiological disorders together with extension of shelf-life in both the cultivars. 1-MCP treatment completely blocked the incidence of internal browning of 'Wonhwang' pears harvested at 130 DAFB, and reduced the incidences of pithiness and core browning, while it promoted the flesh spot decay disorder regardless of harvest time. 1-MCP treatment was of little benefit for the prevention of physiological disorders in 'Whasan' pears compared with those of 'Wonhwang'.

본 연구에서는 1-MCP 처리가 조생종 '원황' 및 중생종 '화산 '배의 상온유통기간 중 과실품질 및 생리장해 발생 경감에 미치는 영향을 조사하였다. '원황' 배는 만개 후 130일과 140일에, '화산' 배는 만개 후 135, 145 및 150일에 각각 수확하여 실험에 이용하였다. 1-MCP를 $1{\mu}L{\cdot}L^{-1}$ 농도로 처리한 후 $25^{\circ}C$ 상온에서 21일간 유통시킨 후 과실경도를 조사한 결과, 1-MCP 처리에 의한 과실 경도 저하 지연효과가 인정되었다. '원황' 배에 있어 만개 후 130일에 수확한 과실의 경우, 무처리구의 과실 경도는 상온유통 14일 후 32.3 N, 21일 후 10.1N으로 유통기간이 경과하면서 경도가 급격하게 저하되었다. 1-MCP 처리구는 같은 조사 기간에 각각 39.4 및 33.1N으로 무처리구에 비해 유의하게 높게 유지되었다. 만개 후 140일에 수확한 '원황'에 있어서는 상온유통 14일에 각각 14.8 및 35.0N으로 1-MCP 처리구의 경도가 두 배 이상 높게 유지되었고 유통 21일에는 1-MCP 처리구가 33.3N이었던 반면 무처리구는 6.6N으로 상품성을 완전히 상실하였다. '화산'에 대한 1-MCP 처리 효과는 수확시기가 늦은 과실에서 효과가 크게 나타났다. '원황'에 대한 1-MCP 처리는 각 수확기에 있어 가용성고형물 함량이 높게 유지되는 경향을 보였는데 '화산'에 있어서는 1-MCP 처리에 따른 함량차이는 인정되지 않았고 1-MCP 처리에 의한 산함량 감소지연효과도 '원황'에서만 나타났다. 에틸렌 발생량은 '원황'의 경우 수확시기가 늦은 과실에서 다소 높게 측정되었으나 최대 $0.58{\mu}l{\cdot}L^{-1}$으로 매우 소량에 머물렀는데 '화산'의 경우에는 '원황'에 비해 현저히 낮은 수준으로 검출되었고 1-MCP 처리유무 및 유통기간의 경과에 따른 유의한 변화가 없었다. 유통기간 중 1-MCP 처리에 따른 과실의 호흡량은 '원황'에 대한 1-MCP 처리는 만개 후 130일 및 140일 수확 과실에 있어서 상온유통 14일에 무처리구 대비 각각 44 및 50% 감소시킨 것으로 조사되었다. '화산'의 호흡량은 '원황'에 비해 유의하게 낮은 수준으로 조사되었고 1-MCP 처리에 따른 호흡률의 감소는 관찰되지 않았다. 과실내부에 발생하는 생리장해를 측정한 결과, 두 품종 모두 수확시기가 늦어지는 경우 증가하는 경향이었다. '원황'에 있어 만개 후 130일 수확 과실에 대한 1-MCP 처리는 과육갈변을 완전히 방지하였고, 바람들이 및 과심갈변의 발생을 현저히 경감되었던 반면 flesh spot decay 장해는 증가하였다. 1-MCP 처리는 '원황'에서만 생리장해 경감효과가 나타났고 상대적으로 '화산'에서는 그 효과가 다소 떨어지는 것으로 조사되었다.

Keywords

References

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