Mazrou Ragia M, Hassan Sabry, Yang Mei, Hassan Fahmy A S
Horticulture Department, Faculty of Agriculture, Menoufia University, Shebin El Kom 32516, Egypt.
Department of Biology, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia.
Plants (Basel). 2022 Oct 14;11(20):2713. doi: 10.3390/plants11202713.
The vase life of cut rose is relatively short, therefore; preserving its postharvest quality via eco-friendly approaches is of particular economic importance. From the previous literature, despite melatonin (MT) plays diverse important roles in the postharvest quality maintenance, its impact on preserving the postharvest quality of cut flowers is really scarce. This research therefore was undertaken to find out the possibility of exogenous MT as an eco-friendly preservative to extend the vase life of cut roses. The flowering stems of cv. 'First Red' were pulsed in MT solutions at 0, 0.1, 0.2 and 0.3 mM for 30 min and then transferred to distilled water for evaluation. The vase life was significantly prolonged and relative water content was considerably maintained due to MT application compared to the control, more so with 0.2 mM concentration which nearly doubled the vase life (1.9-fold) higher than the control. SEM investigation showed that MT treatment reduced the stomatal aperture in lower epidermis which was widely opened in control flowers. MT treatment significantly increased the phenol content, glutathione (GSH) content and CAT, APX and GR enzyme activities compared to untreated flowers. Additionally, the radical scavenging capacity in MT-treated flowers was considerably higher than that of control and therefore MT treatment reduced HO production and lipid peroxidation, which altogether reflected in membrane stability maintenance.
切花玫瑰的瓶插寿命相对较短，因此，通过环保方法保持其采后品质具有特别重要的经济意义。从以往的文献来看，尽管褪黑素（MT）在采后品质维持中发挥着多种重要作用，但其对切花采后品质保存的影响却非常少见。因此，本研究旨在探讨外源MT作为一种环保保鲜剂来延长切花玫瑰瓶插寿命的可能性。将‘First Red’品种的花茎在0、0.1、0.2和0.3 mM的MT溶液中脉冲处理30分钟，然后转移到蒸馏水中进行评估。与对照相比，由于MT的应用，瓶插寿命显著延长，相对含水量得到显著维持，浓度为0.2 mM时效果更明显，其瓶插寿命比对照延长了近一倍（1.9倍）。扫描电镜观察表明，MT处理降低了下表皮气孔孔径，而对照花的气孔孔径则是开放的。与未处理的花相比，MT处理显著提高了酚类含量、谷胱甘肽（GSH）含量以及CAT、APX和GR酶活性。此外，MT处理的花的自由基清除能力明显高于对照，因此MT处理减少了HO的产生和脂质过氧化，这一切都反映在膜稳定性的维持上。
