Articles
Responses of antioxidant activity to light qualities during vase life of cut rose flower
Article number
1423_34
Pages
269 – 276
Language
English
Abstract
Rose petals contain polyphenols, tannins, and flavonoids, and red petals are especially rich in anthocyanin, making them valuable as functional materials.
In the case of cut rose flowers, they are mainly consumed for ornamental purposes, but using the various functional substances contained in the petals can contribute to the creation of new demand in flower industries.
In general, specific light wavelengths are known to be one of the important environmental factors that affect the increase of functional metabolites in plant tissues.
This study applied different light conditions, such as darkness (D), white LEDs (W), and a mixture of white LEDs and UV-B (W+UVB) treatments during 6 d of vase life of the red-petaled cut rose flower ‘Vital’. For each treatment group, cut flowers were exposed to light treatments for 12 h day‑1 with leaves attached or removed.
DPPH antioxidant scavenging activity of inner petals was mainly increased by W and W+UVB treatments.
Especially, when UVB was irradiated, the DPPH scavenging activity of the outer petals also increased.
The total phenolic content was mostly accumulated in the inner petals, and the accumulation amount was relatively increased in cut flowers without leaves under D and W conditions.
Whereas, cut flowers with leaves showed a higher total phenolic content under W+UVB, compared to the other light conditions.
Similarly, the total flavonoid content was also found to be high in the outer petals of cut flowers with leaves under UVB irradiation.
Compared to other light conditions, UVB irradiation caused less damage to the rose petals and the red color was maintained, so it is proposed to be a sterilization effect of the irrigation fluid by UVB or an effect of increasing antioxidants due to increased synthesis of anthocyanins.
In the case of cut rose flowers, they are mainly consumed for ornamental purposes, but using the various functional substances contained in the petals can contribute to the creation of new demand in flower industries.
In general, specific light wavelengths are known to be one of the important environmental factors that affect the increase of functional metabolites in plant tissues.
This study applied different light conditions, such as darkness (D), white LEDs (W), and a mixture of white LEDs and UV-B (W+UVB) treatments during 6 d of vase life of the red-petaled cut rose flower ‘Vital’. For each treatment group, cut flowers were exposed to light treatments for 12 h day‑1 with leaves attached or removed.
DPPH antioxidant scavenging activity of inner petals was mainly increased by W and W+UVB treatments.
Especially, when UVB was irradiated, the DPPH scavenging activity of the outer petals also increased.
The total phenolic content was mostly accumulated in the inner petals, and the accumulation amount was relatively increased in cut flowers without leaves under D and W conditions.
Whereas, cut flowers with leaves showed a higher total phenolic content under W+UVB, compared to the other light conditions.
Similarly, the total flavonoid content was also found to be high in the outer petals of cut flowers with leaves under UVB irradiation.
Compared to other light conditions, UVB irradiation caused less damage to the rose petals and the red color was maintained, so it is proposed to be a sterilization effect of the irrigation fluid by UVB or an effect of increasing antioxidants due to increased synthesis of anthocyanins.
Authors
C.S. Gil, S.Y. Jang, H.G. Choi, S.Y. Kang, S. Heo, D.S. Kim, S.K. Jung
Keywords
antioxidants, LEDs, light environment, rose petal, UV-B
Online Articles (43)