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Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Plant Sci. | doi: 10.3389/fpls.2019.01513

Characterization of fruit quality attributes and cell wall metabolism in 1-methylcyclopropene (1-MCP) treated 'Summer King' and 'Green Ball' apples during cold storage

 Nay Myo Win1, Jingi Yoo1, Soon-Il Kwon2,  C Watkins3 and  In-Kyu Kang1*
  • 1Kyungpook National University, South Korea
  • 2National Institute of Horticultural and Herbal Science, Rural Development Administration, South Korea
  • 3School of Integrative Plant Science, College of Agriculture and Life Sciences, Cornell University, United States

This study aimed to elucidate whether 1-methylcyclopropene (1-MCP) treatment delays the fruit softening mechanism associated with fruit quality of the newly released apple cultivars ‘Summer King’ and ‘Green Ball’ during cold storage. For both cultivars, the fruit treated with 1-MCP exhibited lower internal ethylene concentration, higher firmness, and higher titratable acidity over the control fruit, in association with less fruit softening. In addition, the treated fruit significantly delayed fresh weight loss and reduction of soluble solids content, especially in ‘Green Ball’. Moreover, slower degradation of cell wall components (water-soluble pectin, sodium carbonate-soluble pectin, hemicellulose, and cellulose) was also observed in the treated fruit in comparison to the control fruit. Similarly, the enzymatic activities (of polygalacturonase, pectin methylesterase, cellulase, β-galactosidase, and α-L-arabinofuranosidase) that cause cell wall degradation were relatively lower in the treated fruit than the control fruit for both cultivars, which was further proved by transcriptional analysis of the genes encoding the enzymes. Overall, the results suggested that the exploitation of 1-MCP is useful to delay the fruit softening mechanism of the two cultivars during cold storage, especially by delaying the degradation of cell wall components and enzymatic activities of cell wall hydrolysis.

Keywords: Malus domestica Borkh, 1-methylcyclopropene (1-MCP), Fruit quality attribute, Cell wall component, Cell wall-modifying enzyme, Cold storage

Received: 21 Aug 2019; Accepted: 31 Oct 2019.

Copyright: © 2019 Win, Yoo, Kwon, Watkins and Kang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Prof. In-Kyu Kang, Kyungpook National University, Daegu, South Korea, kangik@knu.ac.kr