纳米银对瓶插月季切花乙烯作用的拮抗效应

 以月季‘影星’（Rosa hybrida‘Movie Star’）切花为试材，用5、10和30 mg · L^-1纳米银（nano-silver，NS）溶液，0.5 mmol · L^-1硫代硫酸银（silver thiosulfate，STS）溶液和去离子水（对照）分别预处理花枝（长为25 cm）基端2 h后再移至去离子水中瓶插，之后用10 μL · L^-1外源乙烯处理24 h，观测切花瓶插期间的观赏品质，瓶插寿命，花径和花枝鲜样质量等指标的变化。结果表明：乙烯处理可加快切花失水凋萎及叶片脱落，并抑制花朵开放，而NS处理可显著减轻乙烯处理的不利影响，其中以30 mg · L^-1 NS处理效果最佳，该处理月季切花的瓶插寿命比乙烯处理延长7 d。另外，取月季切花的花朵（带5 cm花茎，无叶）进行上述试验，进一步证实乙烯处理可抑制花朵开放，而NS处理可显著减轻乙烯对花朵开放的抑制作用。

Nano-silver Treatments Alleviated the Harmful Effects of Exogenous Ethylene on Cut Roses

To study the anti-ethylene effects of nano-silve(rNS)treatments on cut-flowers rose(sRosa hybrida‘Movie Star’),the cut flowering stems(25 cm long)were pre-treated for 2 h with NS(5,10 and 30 mg · L-1)or silver thiosulfate(STS,0.5 mmol · L-1)solution with de-ioned(DI)water as control, thereafter they were immediately placed in vases containing DI water and then exposed to 10 μL · L-1 ethylene for 24 h. The changes in ornamental quality,vase life,flower diameter and fresh mass of cut roses during their vase period were investigated. The results showed that exogenous ethylene treatment caused quick wilting of flowers and leaves,early abscission of leaves and obvious inhibition in flower opening of cut roses,thus seriously affected their ornamental quality and shortened the vase life. NS treatments could significantly alleviated above harmful effects of exogenous ethylene on cut roses,the treatment with 30 mg · L-1 NS was the best among all treatments,which extended the vase life by 7 d compared with the ethylene treatment. Additionally,the similar experiments using the detached flowers from cut roses(with 5 cm stem and without leaves)further certified that NS treatments could effectively alleviate the inhibition in flower opening owing to exposure to exogenous ethylene.