Csepregi, Kristóf and Kőrösi, László and Teszlák, Péter and Hideg, Éva (2018) How do grapevine leaf phenolic contents respond to daily changes in environmental factors? In: International Association of Plant UV Research 2nd Network Meeting, 2018.04.15-18., Bled (Slovenia).
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Abstract
Grapevine leaves are rich in phenolic compounds, many of which are – among fulfilling other roles – efficient antioxidants (Csepregi et al. 2016, Csepregi and Hideg 2017). The long-term aim of a recently launched project is to explore the functional plasticity of phenolic compounds in grapevine leaves. Here we present results of a pilot study, registering and analysing hour-by-hour changes in photosynthesis, phenolic profiles and antioxidant capacities of South-facing Pinot noir leaves between 7 am and 7 pm during a clear summer day mid-July at Pécs (N46.071, E18.156). During this 12h period, photosynthetically active radiation (PAR) was 80-2130 µmol/m2/s and UV radiation (UV-A+B) varied between 5-46.1 kJ/m2 as physical dose measured on site. Local data were separated into UV-B (280-315 nm) and UV-A (315-400 nm) regions based on a model calculation (NCAR). Total adaxial flavonoid content (measured as Dualex flavonoid index) varied between 88% and 112% of the daily average and showed strong positive correlations with PAR, UV-A, UV-B, leaf temperature and net CO2 assimilation. Stomatal conductance (gs) was positively correlated with PAR, UV-A and UV-B. However, substomatal CO2 concentrations (Ci) were only correlated with PAR (positively) and not with UV. Hourly changes in leaf antioxidant capacities and phenolic profiles measured with HPLC-DAD complete the analysis.
Item Type: | Conference or Workshop Item (Poster) |
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Subjects: | Q Science / természettudomány > QK Botany / növénytan > QK10 Plant physiology / növényélettan |
Depositing User: | Dr. László Tamás Kőrösi |
Date Deposited: | 26 Sep 2018 01:55 |
Last Modified: | 05 Apr 2023 07:44 |
URI: | http://real.mtak.hu/id/eprint/85370 |
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