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Effects of 1-MCP on Ripening and Softening of Nectarine

Author: WangJunNing
Tutor: RaoJingPing
School: Northwest University of Science and Technology
Course: Pomology
Keywords: Qinguang" nectarine 1-MCP (1-methylcyclopropene) Softening Storage
CLC: S662.1
Type: Master's thesis
Year: 2002
Downloads: 254
Quote: 7
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Abstract


The effects of 1-MCP on respiration rates, the rates of ethylene production, fruit firmness, membrane permeability, the contents of starch cellulose x alcohol-insoluble substances alkaline-soluble pectin EDTA-soluble pectin and water-soluble pectin, the activities of amylase cellulase PG enzyme and the qualities of "Qinguang" nectarine fruits and ethylene-induced fruits were studied in this thesis. The physiological and biochemical mechanism of ripening and softening of nectarines treated with 1-MCP were also discussed. All above provided theoretical bases for 1-MCP applying to fruits storage.The results of study showed that " Qinguang" nectarine was climacteric fruit, and had significant peaks of respiration and ethylene production. 1-MCP could reduce the rates of respiration and ethylene production, and remarkably degrade the height of ethylene peak that it was only half of the control ones. It postphoned the appearing time of respiration and ethylene production, but increased the height of respiration peak. It also delayed the loss of firmness, retarded the hydrolysis of protein Vc Starch Cellulose alkaline-insoluble pectin and the increase of Water-soluble pectin, inhibited the activities relating to fruit softening such as amylase cellulase PG enzyme and the loss of titratable acidity and fruit weight, and decreased MDA content and membrane permeability. It had no effects on the activity of ACC oxidase and the content of water-soluble sugar.1-MCP restrained the loss of fruit firmness the increase of respiration rates ethylene production rates and protein, postphoned the appearing time of respiration and ethylene production, prevented the hydrolysis of cellulose and pectin, inhibited the increase of protein content and the enzyme activities relating to fruit softening and retarded the changes of fruit colour induced by exogenous ethylene.

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CLC: > Agricultural Sciences > Gardening > Fruit trees gardening > Drupe > Peach
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