Aalifar Mostafa, Aliniaeifard Sasan, Arab Mostafa, Zare Mehrjerdi Mahboobeh, Dianati Daylami Shirin, Serek Margrethe, Woltering Ernst, Li Tao
Photosynthesis Laboratory, Department of Horticulture, Aburaihan Campus, University of Tehran, Tehran, Iran.
Faculty of Natural Sciences, Institute of Horticultural Production Systems, Floriculture, Leibniz University Hannover, Hannover, Germany.
Front Plant Sci. 2020 May 26;11:511. doi: 10.3389/fpls.2020.00511. eCollection 2020.
Improving marketability and extension of vase life of cut flowers has practical significance for the development of the cut flower industry. Although considerable efforts have been made over many years to improve the vase life of cut flowers through controlling the immediate environment and through post-harvest use of floral preservatives, the impact of lighting environment on vase life has been largely overlooked. In the current study, the effect of three LED light spectra [white (400-730 nm), blue (peak at 460 nm), and red (peak at 660 nm)] at 150 μmol m s on vase life and on physiological and biochemical characteristics of carnation cut flowers was investigated. Exposure to blue light (BL) considerably delayed senescence and improved vase life over that of flowers exposed to red light (RL) and white light (WL). HO and malondialdehyde (MDA) contents in petals gradually increased during vase life; the increase was lowest in BL-exposed flowers. As a consequence, BL-exposed flowers maintained a higher membrane stability index (MSI) compared to RL- and WL-exposed flowers. A higher activity of antioxidant enzymes [superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), and ascorbate peroxidase (APX)] was detected in petals of BL-exposed flowers, compared to their activities in RL- and WL-exposed flowers. In BL-exposed flowers, the decline in petal carotenoid contents was delayed in comparison to RL- and WL-exposed flowers. Maximum quantum efficiency of photosystem II (Fv/Fm) and a higher percentage of open stomata were observed in leaves of BL-exposed flowers. Sucrose and glucose contents accumulated in petals during vase life; sugar concentrations were higher in BL-exposed flowers than in RL- and WL-exposed flowers. It is concluded that BL exposure improves the vase life of carnation cut flowers through its effect on the antioxidant defense system in petals and on photosynthetic performance in the leaves.
提高切花的适销性和延长其瓶插寿命对切花产业的发展具有实际意义。尽管多年来人们通过控制切花的即时环境以及采后使用花卉保鲜剂等方式，为延长切花的瓶插寿命付出了巨大努力，但光照环境对瓶插寿命的影响在很大程度上被忽视了。在本研究中，研究了三种150 μmol m² s⁻²光质的LED光[白光（400 - 730 nm）、蓝光（峰值在460 nm）和红光（峰值在660 nm）]对康乃馨切花瓶插寿命以及生理生化特性的影响。与暴露于红光（RL）和白光（WL）的花朵相比，暴露于蓝光（BL）能显著延迟衰老并延长瓶插寿命。在瓶插期间，花瓣中的过氧化氢（HO）和丙二醛（MDA）含量逐渐增加；暴露于蓝光的花朵中这一增加量最低。因此，与暴露于红光和白光的花朵相比，暴露于蓝光的花朵保持了更高的膜稳定性指数（MSI）。与暴露于红光和白光的花朵相比，在暴露于蓝光的花朵花瓣中检测到更高的抗氧化酶[超氧化物歧化酶（SOD）、过氧化物酶（POD）、过氧化氢酶（CAT）和抗坏血酸过氧化物酶（APX）]活性。与暴露于红光和白光的花朵相比，暴露于蓝光的花朵花瓣中类胡萝卜素含量的下降有所延迟。在暴露于蓝光的花朵叶片中观察到光系统II的最大量子效率（Fv/Fm）和更高比例的开放气孔。在瓶插期间，花瓣中积累了蔗糖和葡萄糖；暴露于蓝光的花朵中的糖浓度高于暴露于红光和白光的花朵。研究得出结论，蓝光照射通过对花瓣中的抗氧化防御系统和叶片中的光合性能产生影响，从而提高了康乃馨切花的瓶插寿命。
