乙烯及1-MCP处理对不同开花指数牡丹切花开放衰老进程和水分平衡的影响

目的]研究乙烯及1-MCP对不同开放阶段‘洛阳红’牡丹切花开放及衰老进程中切花品质及水分平衡的影响。方法]以开花指数为1、2、3级的‘洛阳红’牡丹切花为试材,测定了其开放及衰老进程中花径增大率、开花指数、水分平衡及瓶插寿命对不同处理的响应。结果]采用10.0μl/L外源乙烯处理6 h加快了切花的开放进程,缩短了切花的瓶插寿命及最佳观赏期持续时间,而采用1.0μl/L1-MCP处理6 h则延缓了切花的开放进程,延长了切花的瓶插寿命,但抑制了切花的正常开放。对水分平衡值的研究表明,水分平衡值的动态变化是影响‘洛阳红’牡丹切花衰老的重要因素,1-MCP处理改善了切花的水分平衡,使水分平衡值为0的时间延后。结论]1-MCP主要通过延缓‘洛阳红’牡丹切花的开放进程来延长切花的瓶插寿命。

Influences of Ethylene and 1-MCP Treatments on the Opening and Senescence Process and Water Balance of Peony Cut Flowers with Different Flowering Indexes

Objective]The aim was to study the effects of ethylene and 1-MCP on cut flower quality and water balance in the opening and senescence course of peony cut flowers of 'Luoyanghong' during their different opening stages.Method] With peony cut flowers of 'Luoyanghong' with flowering index of class Ⅰ、Ⅱ and Ⅲ as tested material,the response on different treatments for increasing rate of flower diameter,flowering index,water balance and vase life during peony opening and senescence was determined.Result] The opening process of cut flower was accelerated,vase life and the duration of the best ornamental period of cut flower were shortened by using 1.0 μl/L exogenous ethylene treatment for 6 h,however,the opening process of cut flower was delayed,vase life prolonged,but the normal opening of cut flower was restrained by adopting 1.0 μl/L 1-MCP treatment for 6 h.The research on water balance value showed that the dynamic change of water balance value was the important factor to affect the senescence of peony cut flowers of 'Luoyanghong',the 1-MCP treatment improved the water balance of cut flower and delayed the time that could make the water balance value as zero.Conclusion] The 1-MCP prolonged the vase life of cut flower mainly by delaying the opening process of peony cut flowers of 'Luoyanghong'.