Effect of Twice Treatment with Different Cyclopropene Ethylene Inhibitors on Postharvest Ethylene Biosynthesis and Gene Expression of Tomato Fruits

Abstract:

Effect of twice treatment with three cyclopropene ethylene inhibitors with different 1 substituted branch chain lengths on postharvest ethylene biosynthesis and gene expression of tomato fruits(Solanum lycopersicum L.) were investigated in this manuscript.The fruits were packed with plastic bags(0.02 mm) after being fumigated for 20h with 0.75 μL/L 1-MCP(1 Methylcyclopropene),2 μL/L 1-PentCP(1-pentylcyclopropene) or 0.5 μL/L 1-OCP(1 octylcyclopropene) and then stored at ambient temperature(20 ℃) for maturation evalution,and second time treated wound be in 8 days as the first.The results show that treatments with any one of these three inhibitors,compared with that of the untreated fruits,reduced ethylene production and respiration rate were decreased and,the express level of ACS2 and ACO1 gene were lower in the fruits.Furthermore,these effects tended to decrease as the 1-substituted branch chain length of the cyclopropenes increased.In addition,treatments with any inhibitors delayed physiological metabolism and maintained fruit quality.Twice treatments,however,did not exert obvious effects.