Effect of 1-Methylcyclopropene Treatment on Quality and Ethylene Production of Muskmelon (Cucumis melo L. cv. Reticulatus) Fruit

1-Methylcyclopropene 처리가 머스크멜론 과실의 에틸렌 발생과 품질에 미치는 영향

Cha, Ju-Hyeong;Lee, Geung-Pyo;Hwang, Byeong-Ho;Kim, Jong-Ki;Lee, Eun-Ji
차주형;이긍표;황병호;김종기;이은지

  • Published : 20060000

Abstract

Before the onset of climacteric, mature muskmelon fruit (var. ‘Pearl’) grown and harvested from a plastic house was applied with 1-methylcyclopropene (1-MCP), a gaseous inhibitor of ethylene. And its subsequent molecular metabolic changes including expression of genes involved in biosynthesis and perception of ethylene were monitored during storage at 25℃. Fruit treated with 1.0 μLL-1 of 1-MCP for 12 hours displayed a very slow process in ripening-associated physiological changes, compared to fruit provided with air, served as a control. Only a slight increment in ethylene production, accompanied by a significant delay of tissue softening and of yellow color development in fruit skin was manifested by 1-MCP treatment. However, change of total soluble solids content from the fruit either treated with the inhibitor or air remained fairly constant 4 days after the inhibitor treatment. The application of 1-MCP to the muskmelon fruit reduced the expression of CM-ACS1 and delayed the normal expression of CM-ACO1 when compared to the control. However, expression of genes involved in ethylene reception, CM-ETR1 and CM-ERS1, remained fairly unaffected for 15 days of storage after 1-MCP application. These data obtained in the present study support that 1-MCP blocks ethylene binding to its receptor and thus, inhibiting the action of ethylene, consequently suppressing the autocatalytic expression of CM-ACS1. A relatively small peak in ethylene production displayed by 1-MCP treatment can be ascribed to reduced amounts of expression of CM-ACS1 rather than CM-ACO1, lending to inhibition of an autocatalytic production of ethylene, which is a prerequisite for climacteric fruit to undergo ripening.

본 연구는 네트멜론 ‘Pearl’ 과실을 공시하여 1μLL-1 농도로 12시간 1-MCP를 처리한 후 25℃에서 저장하며 에틸렌 생합성과 관련된 유전자들의 발현양상과 과실의 품질변화를 조사하였다. 과실의 경도는 무처리구에서는 처리 96시간 경과 후에 8.4N에서 2.6N으로 급격하게 낮아졌으나, 1-MCP처리구에서는 360시간 경과 후에도 3.9N를 유지하였다. 과실의 색도(Hunter ‘a’, ‘b’ 값)는 무처리구에서는 처리 후 72시간이 경과하면서 과피가 급속히 노랗게 착색되었으나, 1-MCP 처리구에서는 동기간 동안 완만하게 노란색이 증가하였다. 과실의 당도는 무처리구에서 10.1oBrix로 급격히 증가한 다음 그 이후에는 약간 감소한 반면에, 처리구에서는 완만하게 증가한 뒤 9.0oBrix 정도로 유지되다가 이후 7.0oBrix로 감소하였다. 한편, 과실의 에틸렌 발생은 무처리구에서는 96시간 경과 후 몇시간에 걸쳐 에틸렌이 급격히 증가하는 전형적인 climacteric 현상을 보였으나, 처리구에서는 360시간이 지나도록 2μLkg-1h-1 이하로 유지되었으며, 일시적인 증가는 나타나지 않았다. 1-MCP처리구에서 ripening 중 에틸렌 생합성에 관련된 유전자인 CM-ACS1과 CM-ACO1의 발현양상은 무처리구에 비해 전체적으로 정량적으로 감소하는 경향이었으며, 동시에 발현이 증가되는 시기도 지연되었다. 그러나 에틸렌 수용단백질인 CM-ETR1과 CM-ERS1은 처리구에서 발현이 다소 지연되는 것을 관찰할 수 있었으나 발현양에서는 큰 차이를 보이지 않았다. 본 연구로부터 1-MCP는 에틸렌 수용체와 결합하여 에틸렌의 자가촉매현상(system 2)를 억제함으로써 멜론과실의 에틸렌 발생과 조직의 연화를 지연시켰다. 한편 과실의 당도도 별로 영향을 받지 않았다.

Keywords

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