Effect of 1-Methylcyclopropene on the Expression of Genes for Ascorbate Metabolism in Postharvest Cauliflower

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  • Ma Gang
    The United Graduate School of Agricultural Science, Gifu University (Shizuoka University) Faculty of Agriculture, Shizuoka University
  • Zhang Lancui
    Faculty of Agriculture, Shizuoka University
  • Kato Masaya
    Faculty of Agriculture, Shizuoka University
  • Yamawaki Kazuki
    Faculty of Agriculture, Shizuoka University
  • Asai Tatsuo
    Faculty of Agriculture, Shizuoka University
  • Nishikawa Fumie
    Kuchinotsu Citrus Research Station, National Institute of Fruit Tree Science
  • Ikoma Yoshinori
    Okitsu Citrus Research Station, National Institute of Fruit Tree Science
  • Matsumoto Hikaru
    Okitsu Citrus Research Station, National Institute of Fruit Tree Science

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  • 収穫後のカリフラワーにおけるアスコルビン酸代謝に関わる酵素遺伝子の発現に及ぼす 1-メチルシクロプロペンの影響

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The effects of 1-methylcyclopropene (1-MCP) on ascorbate (AsA) metabolism were studied and the possible molecular mechanisms were discussed for two cultivars of cauliflower (Brassica oleracea, L. var. botrytis), ‘Violet Queen’ and ‘Snow Crown’. Ethylene production was suppressed in ‘Violet Queen’, while it was increased in ‘Snow Crown’ by 1-MCP treatment. Meanwhile, the changing patterns of AsA metabolism after harvest were different between the two cauliflower cultivars. In ‘Violet Queen’, AsA content decreased in the control after harvest, and the loss of AsA was delayed by 1-MCP treatment. In ‘Snow Crown’, AsA content remained almost constant and was not affected by 1-MCP treatment. In ‘Violet Queen’, the gene expression of BO-APX1, BO-APX2, and BO-sAPX was down-regulated, while the gene expression of BO-DHAR and BO-GLDH was up-regulated by 1-MCP treatment. The regulation of these genes contributed to the suppression of AsA reduction in ‘Violet Queen’ treated by 1-MCP. In ‘Snow Crown’, simultaneous down-regulation of BO-APX1, BO-APX2, and BO-sAPX, which were responsible for AsA breakdown, and BO-MDAR1, BO-MDAR2, BO-DHAR, and BO-GLDH, which were responsible for AsA regeneration and biosynthesis, might lead to maintain the AsA level constant with 1-MCP treatment.<br>

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