在文心兰不同开花阶段施用保鲜剂对切花衰老的影响

为了了解保鲜剂对不同开花阶段文心兰鲜切花的保鲜效果,利用乙烯作用剂硫代硫酸银(silver thiosulfate,STS)、1-甲基环丙烯或聪明鲜(1-methylcyclopropene,1-MCP)及乙烯释放剂乙烯利对不同开放阶段的鲜切花进行处理。结果表明:乙烯利处理在半开放期后可明显缩短文心兰切花的衰老进程,STS处理可延长盛开前期和盛开期的时间,而1-MCP处理可延长衰老初期和衰老期的时间。同时,对文心兰开花各个阶段乙烯释放和1-氨基环丙烷1-羧酸(1-aminocyclopropane-1-carboxylic acid,ACC)含量进行了测定,结果显示,蕊柱和花萼中ACC含量在绽口期和半开放期基本稳定,而半开放期之后开始增加,而乙烯释放量在盛开前期后上升。花瓣ACC含量在盛开前期后缓慢增加,在衰老初期达到峰值。表明文心兰花器官内源乙烯生物合成的启动对保鲜剂不同阶段的处理效果有一定的影响和相关性。

Effects of Preservatives Applied at Different Flowering Stages on Cut Flower Senescence of Oncidium Gower Ramsey

Oncidium flowers (Oncidium Gower Ramsey) at different flowering stages were treated with ethylene agents such as silver thiosulfate (STS) and 1-methylcyclopropene (1-MCP),and ethylene releaser ethephon to observe the effects of the ethylene agents used as preservatives on cut flowers.The results show that the aging process of Oncidium flowers could be obviously shortened by ethephon application after the half-opened stage.The STS treatment could prolong the prior-to-full-opening stage and the full-opened stage of flowers.The 1-MCP treatment could delay the senescing progression of flowers at the initial stage of senescence and the senescence stage.The ethylene production and 1-aminocyclopropane-1-carboxylic acid (ACC) content of the flower parts at different flowering stages were determined.The results showed that ACC contents of the gynandria and sepals of the cut flowers were steady during the bud-burst stage and the half-opened stage,but rose after the half-opened stage,and that ethylene production increased after the prior-to-full-opening stage.ACC contents of petals increased slowly after the prior-to-full-opening stage and peaked at the initial stage of senescence.The effectiveness of the preservatives appeared to be strongly affected by the initiation of endogenous ethylene biosynthesis in Oncidium cut flowers.