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Short-Term Ultraviolet (UV)-A Light-Emitting Diode (LED) Radiation Improves Biomass and Bioactive Compounds of Kale
- Source :
- Frontiers in Plant Science, Frontiers in Plant Science, Vol 10 (2019)
- Publication Year :
- 2019
- Publisher :
- Frontiers Media S.A., 2019.
-
Abstract
- The aim of this study was to determine the influence of two types of UV-A LEDs on the growth and accumulation of phytochemicals in kale (Brassica oleracea var. acephala). Fourteen-day-old kale seedlings were transferred to a growth chamber and cultivated for 3 weeks. The kale plants were subsequently subjected to two types of UV-A LEDs (370 and 385 nm) of 30 W/m2 for 5 days. Growth characteristics were all significantly increased in plants exposed to UV-A LEDs, especially at the 385 nm level, for which dry weight of shoots and roots were significantly increased by 2.22 and 2.5 times, respectively, at 5 days of treatment. Maximum quantum efficiency of photosystem II photochemistry (Fv/Fm ratio) began to decrease after 3 h of treatment compared to the control. The total phenolic content of plants exposed to the two types of UV-A LEDs increased by 25% at 370 nm and 42% at 385 nm at 5 days of treatment, and antioxidant capacity also increased. The two types of UV-A LEDs also induced increasing contents of caffeic acid, ferulic acid, and kaempferol. The reactive oxygen species (ROS) temporarily increased in plants exposed to the two types of UV-A LEDs after 3 h of treatment. Moreover, transcript levels of phenylalanine ammonia-lyase (PAL), chalcone synthase (CHS), and flavanone 3-hydroxylase (F3H) genes and PAL enzyme activity were higher in plants treated with UV-A LEDs. Our results suggested that short-term UV-A LEDs were effective in increasing growth and improving antioxidant phenolic compounds in kale, thereby representing a potentially effective strategy for enhancing the production of phytochemicals.
- Subjects :
- 0106 biological sciences
Chalcone synthase
Antioxidant
Photosystem II
medicine.medical_treatment
Plant Science
antioxidant capacity
lcsh:Plant culture
01 natural sciences
Ferulic acid
03 medical and health sciences
chemistry.chemical_compound
Caffeic acid
medicine
lcsh:SB1-1110
Food science
kale
030304 developmental biology
Original Research
phenolic compound
reactive oxygen species
0303 health sciences
biology
UV-A LEDs
transcript level
chemistry
Shoot
biology.protein
Kaempferol
Flavanone
010606 plant biology & botany
Subjects
Details
- Language :
- English
- ISSN :
- 1664462X
- Volume :
- 10
- Database :
- OpenAIRE
- Journal :
- Frontiers in Plant Science
- Accession number :
- edsair.doi.dedup.....f1e0d9d7d175fb7ecb65d92955ede19b