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Low temperature forcing reduces oxidative stress in lilac flowers
Agata Jedrzejuk,Aleksandra Lukaszewska,Julita Rabiza-Swider,Ewa Skutnik 한국원예학회 2016 Horticulture, Environment, and Biotechnology Vol.57 No.6
In common lilac, natural flower bud formation starts in July and proceeds until the end of October, when deep dormancy begins, allowing buds to overwinter. In spring after winter chilling, generative lilac buds resume growth and bloom in May. With the use of forcing procedures, blooming of common lilac is possible in autumn and winter when buds are typically in a deep dormancy state. The temperature commonly used to begin the forcing cycle of lilac in autumn is 37°C, while 16°C is sufficient to induce flowering in March. Such high temperatures applied in November cause degeneration of flowers, which may be due to an oxidative stress following the overproduction of reactive oxygen species (ROS). The aim of this study was to determine and compare the concentration of the ROS hydrogen peroxide (H2O2); the content of malondialdehyde (MDA), an indicator of lipid peroxidation; and the activity of antioxidant enzymes in flowers of common lilac under natural flowering conditions and forced flowering at 37°C or 15°C. The highest H2O2 content and the lowest catalase (CAT) activity were observed in lilacs forced at 37°C. Flowers collected from lilacs forced under 15°C had the highest content of soluble proteins, peroxidase (POD), and superoxide dismutase (SOD) activity, and the lowest H2O2 content. These results indicate that forcing shrubs, even those in a deep dormancy state, under low (15°C) temperature protects the antioxidant defense system and allows the plant to produce panicles of high quality, though the flowering date is delayed compared to the standard forcing procedure conducted at 37°C.
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