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http://dx.doi.org/10.7744/cnujas.2010.37.2.209

Effect of 1-MCP and High $pCO_2$ Treatment on the Firmness and Pectin Changes in Peach(Prunus persica) Fruit During Shelf-life  

Kim, Myun-Surn (Dept. of Horticulture, College of Agriculture and Life Science, Chungnam National University)
Min, Jeong-Ho (Dept. of Horticulture, College of Agriculture and Life Science, Chungnam National University)
Chun, Jong-Pil (Dept. of Horticulture, College of Agriculture and Life Science, Chungnam National University)
Kim, Jin-Guk (Dept. of Fruit Science, National Institute of Horticultural & Herbal Science, RDA)
Lee, Eun-Mo (Dept. of Fruit Crops, Chungcheongnam Do, Agricultural Research and Extension Service)
Lee, Ji-Yong (Dept. of Fruit Crops, Chungcheongnam Do, Agricultural Research and Extension Service)
Hwang, Yong-Soo (Dept. of Horticulture, College of Agriculture and Life Science, Chungnam National University)
Publication Information
Korean Journal of Agricultural Science / v.37, no.2, 2010 , pp. 209-216 More about this Journal
Abstract
In order to understand the effects of a single or combined treatments of 1-MCP($1{\mu}L/L$) and $CO_2$(100%) on the firmness of melting type peach fruit(cv. Chunjungdo), fruit were harvested at commercial maturity and examined physiological changes including flesh firmness during 10 days of shelf-life. Firmness loss of fruit was delayed by both single and combined treatments of 1-MCP and $CO_2$. The treatment of 1-MCP was more effective than $CO_2$ treatment but no additive effective on firmness retention was found in the combined treatment. The upsurge of ethylene evolution occurred 5 days of shelf-life in air treated control but ethylene evolution gradually increased in fruit treated by 1-MCP and 1-MCP+$CO_2$. The suppression of ethylene evolution seemed stronger in $CO_2$ treatment. The respiration of fruit significantly inhibited up to 10 days except control where climacteric increase of respiration was found at 10 days of shelf-life. A molecular shift of pectic polymers(an increase of chelator soluble pectins and decrease of water soluble pectins) was induced by both 1-MCP and $CO_2$ treatments. An increase of water soluble pectins was coincident with firmness loss. The delay of firmness loss seemed to be associated with the migration of calcium to wall matrix, especially pectins, resulting in the increase of wall bound calcium. The polygalacturonase activity was significantly reduced by 1-MCP alone 1 day after treatment and increased to similar level of activity 5 days after treatment compared to other treatment except air treated control whereas pectin methylesterase activity seemed not to be affected by both 1-MCP and $CO_2$ treatments. Thus, the molecular shift of pectic polymers appeared not to be related with pectin methylesterase. Further study is required to clarify the softening mechanism associated with molecular shift of pectic polymers and the inter- or intra-cellular movement of calcium ions induced by postharvest treatments of 1-MCP and $CO_2$.
Keywords
wall bound calcium; pectinmethyesterase; polygalacturonase; respiration; ethylene;
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Times Cited By KSCI : 3  (Citation Analysis)
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