Articles
RIPENING OF ´RENDAIJI´ PERSIMMON TREATED WITH 1-METHYLCYCLOPROPENE AFTER ETHANOL VAPOR TREATMENT TO REMOVE ASTRINGENCY
Article number
685_18
Pages
157 – 164
Language
English
Abstract
Rendaiji persimmon fruits, a local astringent cultivar prone to rapid softening after harvest, were harvested at commercial maturity and treated with 20 μLL-1 1-methylcyclopropene (1-MCP) for 24 h after exposure to ethanol vapor for 5 days to remove astringency and to alleviate the symptoms of acetaldehyde-induced rapid softening.
As a result, an application of 1-MCP to Rendaiji delayed softening but had little or no effect on ethylene evolution.
However, 1-amino-cyclopropene- 1-carboxylic acid (ACC) synthase (ACS) activity was greatly suppressed while the inhibition of ACC oxidase (ACO) was transient, lasting until 11 days after 1-MCP treatment.
The levels of ACC as a substrate were also markedly inhibited.
The content of malonyl-1-aminocyclopropene-1-carboxylic acid (MACC), the malonylated conjugate of ACC, was high in fruits after harvest, but decreased steadily, due to a possible inhibition by 1-MCP treatment, whereas in control fruits MACC slightly increased.
The inhibitory effect of 1-MCP on the activity of ACS was not correlated with those on ethylene biosynthesis, which could suggest a differential sensitivity to ethylene depending on tissue type.
The changes in ACO activity coincided with ethylene production in 1-MCP-treated fruits.
As a result, an application of 1-MCP to Rendaiji delayed softening but had little or no effect on ethylene evolution.
However, 1-amino-cyclopropene- 1-carboxylic acid (ACC) synthase (ACS) activity was greatly suppressed while the inhibition of ACC oxidase (ACO) was transient, lasting until 11 days after 1-MCP treatment.
The levels of ACC as a substrate were also markedly inhibited.
The content of malonyl-1-aminocyclopropene-1-carboxylic acid (MACC), the malonylated conjugate of ACC, was high in fruits after harvest, but decreased steadily, due to a possible inhibition by 1-MCP treatment, whereas in control fruits MACC slightly increased.
The inhibitory effect of 1-MCP on the activity of ACS was not correlated with those on ethylene biosynthesis, which could suggest a differential sensitivity to ethylene depending on tissue type.
The changes in ACO activity coincided with ethylene production in 1-MCP-treated fruits.
Publication
Authors
G.I. Ortiz, S. Sugaya, Y. Sekozawa, H. Gemma, H. Ito, K. Wada
Keywords
1-aminocyclopropane-1-carboxylic acid (ACC) oxidase, ACC synthase, ethylene, malonyl-ACC, softening
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