デルフィニウム切り花の萎れに伴う糖代謝酵素活性の変動

DOI NDLデジタルコレクション 日本農学文献記事索引 Web Site Web Site 被引用文献3件 参考文献28件

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  • Changes in Sugar-related Enzymes during Wilting of Cut Delphinium Flowers.

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Abscission of sepals from cut delphinium flowers is prevented by treatment with silver thiosulphate (STS). However, the sepals still wilt and the pistils develop which reduce flower quality. To understand the process of wilting, unrelated to that initiated by ethylene, sugar uptake and metabolism in cut delphinium flowers were examined. STS-treated delphinium sepals wilted 4 to 9 days after harvest accompanied by a decrease in fresh weight while the pistils continued to grow. A decrease in water content with a simultaneous reduction in soluble carbohydrate content suggested that wilting is attributable to a decrease in soluble carbohydrates as the osmoticum. The activities of cell wall and soluble acid invertase, sucrose synthase (SS), and mannitol dehydrogenase (MDH) were measured because these enzymes are related to sink mechanism in sucrose- and mannitol-translocating plants. Cell wall invertase activity and p-chloromercuri-benzenesulfonic acid (PCMBS)-sensitive sucrose uptake by the sepals decreased to a very low level during wilting. When intact florets were supplied with 14C-sucrose, a change in sucrose distribution in sepals corresponded with that in cell wall invertase. Therefore, the reduction in cell wall invertase activity that decreases the soluble carbohydrates as osmoticum could be related to sepal wilting. SS activity that is known to be important in sink metabolism also decreased during sepal wilting, suggesting that SS was related to the wilting. MDH activity in pistils paralleled their rapid growth while cell wall invertase and SS activities remained consistently high except at harvest.

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  • 園芸学会雑誌

    園芸学会雑誌 72 (1), 37-42, 2003

    一般社団法人　園芸学会

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