Abstract Cut dahlia flowers have a short vase life of 3–7 days, and some cultivars exhibit petal abscission, even inside of cardboard boxes during transport. This petal abscission is induced by ethylene in many cases. In the present study, we investigated the role of ethylene in dahlia flower senescence by comparing the responses to ethylene, ethylene inhibitors, and ethylene production among cultivars. Exogenous ethylene significantly accelerated petal abscission in seven cultivars and petal wilting in other five cultivars out of 12 cultivars. Whole florets and detached receptacles (with bracts) produced different amounts of ethylene; ethylene production was higher in ‘Carnelian’ and ‘Port Light Pair Beauty’ than ‘Heavenly Peace’ and ‘Purple Stone’. Onset of senescence was delayed in detached petals compared with attached petals, suggesting that petal abscission was induced by ethylene produced by ovary and receptacles. The ethylene action inhibitor 1-methylcyclopropene inhibited petal abscission and delayed petal wilting in eight cultivars. Moreover, the silver thiosulfate complex delayed petal wilting of ‘Carnelian’. Together, our findings suggested that ethylene plays a role in senescence of cut dahlia flowers and ethylene inhibitors can extend their vase life.

中文翻译：

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大丽花（Dahlia variabilis）品种切花乙烯产量差异及对乙烯的反应

摘要 大丽花切花的瓶插寿命很短，只有 3-7 天，有些品种在运输过程中甚至在纸板箱内出现花瓣脱落现象。在许多情况下，这种花瓣脱落是由乙烯引起的。在本研究中，我们通过比较不同品种对乙烯、乙烯抑制剂和乙烯产量的反应，研究了乙烯在大丽花衰老中的作用。外源乙烯显着加速了7个品种的花瓣脱落和12个品种中其他5个品种的花瓣萎蔫。整个小花和分离的花托（带苞片）产生不同量的乙烯；'Carnelian'和'Port Light Pair Beauty'的乙烯产量高于'Heavenly Peace'和'Purple Stone'。与附着花瓣相比，分离花瓣的衰老开始延迟，表明花瓣脱落是由子房和花托产生的乙烯诱导的。乙烯作用抑制剂1-甲基环丙烯抑制了8个品种的花瓣脱落和延迟花瓣萎蔫。此外，硫代硫酸银复合物延迟了'红玉髓'的花瓣萎蔫。总之，我们的研究结果表明乙烯在大丽花切花的衰老中起作用，乙烯抑制剂可以延长它们的花瓶寿命。