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Abstract Detail



Ecophysiology

Tittmann, Susanne [1], Wohlfahrt, Yvette [1], Stoll, Manfred [1].

Initial physiological response of grapevine (Vitis vinifera L.) in a Free Air Carbon dioxide Enrichment (FACE) experiment .

Within the next 35 years an increase of the atmospheric carbon dioxide (CO2) concentration of approximately 20% to the current level is predicted by the Intergovernmental Panel on Climate Change (IPCC report, 2013). Grapevines are known as climate sensitive; hence impacts on their phenology, physiological processes and grape compositions can be related to a changing climate. Investigations of eco-physiological processes based on chlorophyll fluorescence and leaf gas exchange measurements of field-grown vines can describe the grapevine response to elevated CO2 conditions. Therefore a Free Air Carbon Dioxide Enrichment (FACE) facility for special crops was established in the Rheingau Valley (N 49.984 E 7.954, Geisenheim Germany). For viticulture experiments Vitis vinifera L. cultivar Riesling (clone 198-30 Gm) grafted on rootstock SO4 (clone 47 Gm) was planted in six FACE rings (12 m diameter, three ambient and three elevated CO2) in 2012. Fumigation of CO2 was applied continuously from sunrise to sunset throughout the year. Here we report results of the first growing season under CO2 enrichment (2014). Short- and long term changes of the acclimation of photosystem II (PSII) were monitored using a multichannel chlorophyll fluorometer (MONI-PAM, Walz). Leaf gas exchange was measured with an open gas-exchange system (GFS-3000, Walz). Further, non-invasive detection of vigour-based leaf indices such as flavonol, nitrogen and chlorophyll were assessed using an optical sensor (Dualex, FORCE-A, France). First results showed that higher light intensity and temperature (during flowering in June 2014 ) resulted in lower effective photochemical quantum yield of PSII and electron transport rate (ETR) but higher non-photochemical quenching for elevated CO2 grown Riesling compared to ambient conditions. Further, we found higher net assimilation and reduced transpiration rates during flowering under elevated CO2 conditions. Parallel to these photochemical responses an increase of flavonol index in leaves was observed for elevated CO2 treated plants, which indicates a higher stress level since flavonol is known as a scavenger pigment to avoid damages of the photosystem at severe or prolonged stress situation. Altogether we found first evidence for significant responses of Riesling grown under elevated CO2 conditions. In conclusion, the achieved results may provide first insights of the impact of future conditions on vegetative and generative parameters. Since the preliminary data are only one-season results further investigations will be necessary to confirm our obtained findings.


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1 - Geisenheim University, Department of general and organic viticulture, Von-Lade-Str. 01, Geisenheim, Hesse, 65366, Germany

Keywords:
climate change
grapevine
Photosynthesis
Chlorophyll fluorescence.

Presentation Type: Poster:Posters for Topics
Session: P
Location: Hall D/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 5:30 PM
Number: PEP006
Abstract ID:717
Candidate for Awards:None


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