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

Author:

Milić Komić Sonja1,Živanović Bojana1,Dumanović Jelena2ORCID,Kolarž Predrag3,Sedlarević Zorić Ana1,Morina Filis4,Vidović Marija5ORCID,Veljović Jovanović Sonja1

Affiliation:

1. Institute for Multidisciplinary Research, Department of Life Science, University of Belgrade, Kneza Višeslava 1, 11030 Belgrade, Serbia

2. Department of Analytical Chemistry, Faculty of Chemistry, University of Belgrade, 11158 Belgrade, Serbia

3. Institute of Physics Belgrade, University of Belgrade, 11080 Belgrade, Serbia

4. Biology Center of the Czech Academy of Sciences, Institute of Plant Molecular Biology, Department of Plant Biophysics and Biochemistry, Branišovska 31/1160, 370 05 Ceske Budejovice, Czech Republic

5. Institute of Molecular Genetics and Genetic Engineering, Laboratory for Plant Molecular Biology, University of Belgrade, Vojvode Stepe 444a, 11042 Belgrade, Serbia

Abstract

Three basil plant varieties (Ocimum basilicum var. Genovese, Ocimum × citriodorum, and Ocimum basilicum var. purpurascens) were grown under moderate light (about 300 µmol 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.

Funder

Ministry of Science, Technological Development and Innovation, the Republic of Serbia

Centre for Green Technologies, University of Belgrade

Science Fund of the Republic of Serbia, Green Program of Cooperation between Science and Industry

KOROLID

Institute of Physics Belgrade

Publisher

MDPI AG

Subject

Inorganic Chemistry,Organic Chemistry,Physical and Theoretical Chemistry,Computer Science Applications,Spectroscopy,Molecular Biology,General Medicine,Catalysis

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