Enhancement of Skin Color by Postharvest UV Irradiation in 'Fuyu' Persimmon Fruits

수확 후 자외선 조사에 의한 '부유' 단감의 과피 착색 증진

  • 최성진 (대구가톨릭대학교 생명공학과)
  • Received : 2011.04.25
  • Accepted : 2011.07.11
  • Published : 2011.10.31

Abstract

The effects of UV irradiation, as a hormetic stimulus, on the postharvest persimmon fruits (Diospyros kaki cv. Fuyu) were investigated in regards to the change of carotenoid contents and flesh softening, when the UV irradiation was combined with or without the pretreatment of 1-methylcyclopropene (1-MCP) as an ethylene action inhibitor. The major carotenoid pigments in persimmon fruits were ${\beta}$-carotene, lycopene and ${\beta}$-cryptoxanthin. Of them, the lycopene was a pigment, which increased markedly after harvest. UV irradiation increased the contents of ${\beta}$-carotene and lycopene, enhancing the skin color to scarlet. The treatment accelerated however also the softening of fruit flesh. But the softening of UV irradiated fruits could be delayed significantly by pretreatment with 1-MCP without reducing the advantageous effect of UV irradiation on the carotenoid increase.

에틸렌 작용억제제인 1-MCP의 처리와 함께 수확 후 '부유' 단감 과실에 호르메시스유발원으로 자외선을 조사하였을 때 carotenoid 색소 함량 변화와 함께 에틸렌 생성, 호흡 및 과육 경도의 변화를 조사하였다. 수확 당시 '부유' 단감 과실의 주요 carotenoid 색소는 ${\beta}$-carotene, lycopene, ${\beta}$-cryptoxanthin이었으며, 이 중 lycopene 색소 함량은 수확 이후 실온 저장 기간 중에 크게 증가하는 양상을 보였다. 자외선 조사는 단감에서 ${\beta}$-carotene과 lycopene 색소의 함량을 증가시켜 과피의 착색을 증진하였으나 동시에 자외선 스트레스에 따른 과육의 경도 저하를 촉진하였다. 그러나 자외선 조사에 따른 carotenoid 색소 함량의 증가는 1-MCP 처리의 영향을 받지 않은 반면 과육의 연화는 1-MCP 처리에 의해 크게 지연되었다. 따라서 수확 후 '부유' 단감 과실에 1-MCP 처리와 자외선 조사를 병행할 경우 연화 억제와 과피의 착색 중진을 통한 품질의 향상이 가능할 것으로 생각된다.

Keywords

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