Differential Antioxidant Response to Supplemental UV-B Irradiation and Sunlight in Three Basil Varieties

0583894 - BC 2024 RIV CH eng J - Journal Article
Komic, S. M. - Zivanovic, B. - Dumanovic, J. - Kolarz, P. - Zoric, A. S. - Morina, Filis - Vidovic, M. - Jovanovic, S. V.
Differential Antioxidant Response to Supplemental UV-B Irradiation and Sunlight in Three Basil Varieties.
International Journal of Molecular Sciences. Roč. 24, č. 20 (2023), č. článku 15350. ISSN 1661-6596
R&D Projects: GA MŠMT EF15_003/0000336
Institutional support: RVO:60077344
Keywords : ascorbate * epidermal flavonoids * hydrogen peroxide * Ocimum basilicum var. Genovese * Ocimum x citriodorum * Ocimum basilicum var. purpurascens * polyphenols * supplemented and ecologically relevant UV-B irradiation * total leaf antioxidant capacity
OECD category: Biochemistry and molecular biology
Impact factor: 5.6, year: 2022
Method of publishing: Open access
https://www.mdpi.com/1422-0067/24/20/15350

Three basil plant varieties (Ocimum basilicum var. Genovese, Ocimum x citriodorum, and Ocimum basilicum var. purpurascens) were grown under moderate light (about 300 mu mol photons m(-2) s(-1)) in a glasshouse or growth chamber and then either transferred to an open field (average daily dose: 29.2 kJ m(-2) d-1) or additionally exposed to UV-B irradiation in a growth chamber (29.16 kJ m(-2) d(-1)), to reveal the variety-specific and light-specific acclimation responses. Total antioxidant capacity (TAC), phenolic profile, ascorbate content, and class III peroxidase (POD) activity were used to determine the antioxidant status of leaves under all four light regimes. Exposure to high solar irradiation at the open field resulted in an increase in TAC, total hydroxycinnamic acids (HCAs, especially caffeic acid), flavonoids, and epidermal UV-absorbing substances in all three varieties, as well as a two-fold increase in the leaf dry/fresh weight ratio. The supplemental UV-B irradiation induced preferential accumulation of HCAs (rosmarinic acid) over flavonoids, increased TAC and POD activity, but decreased the ascorbate content in the leaves, and inhibited the accumulation of epidermal flavonoids in all basil varieties. Furthermore, characteristic leaf curling and UV-B-induced inhibition of plant growth were observed in all basil varieties, while a pro-oxidant effect of UV-B was indicated with H2O2 accumulation in the leaves and spotty leaf browning. The extent of these morphological changes, and oxidative damage depended on the basil cultivar, implies a genotype-specific tolerance mechanism to high doses of UV-B irradiation.
Permanent Link: https://hdl.handle.net/11104/0352319