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Abstract ▼ AI-Helper

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 pe...

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 μLㆍL⁻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.

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