G-FORSCHT 2015

REDUCTION OF PETROLEUM AROMA IN RIESLING WINES Many cool climate grapevine growing regions are alrea- dy affected by global climate change. In recent deca- des, the sensory concept of German Riesling wines was marked by fresh and fruity aromas, while aged wines of this variety are characterized by a petrol-like aroma, which is not appreciated in the modern Riesling stylistic. The substance C13-Norisprenoid 1,1,6-trimethyl-1,2-dihy- dronaphthalene (TDN) is considered as a marker com- pound for this undesired sensory impression. Since viti- cultural conditions influence the biogenesis of this substance, the aim of this project was to investigate the outcome of defoliation in the grape zone on the TDN content in berries, musts and wines under cool climate viticulture in combination with the use of two different commercial yeast strains. The results show that both canopy management as well as the choice of the yeast strain seem to be important impacting factors on ‚TDN management‘ and are considered to be helpful tools for avoiding undesired petrol-like notes. In this internatio- nal project, two French research institutions (University of Bordeaux und INRA [Philippe Darriet]) co-operate with Geisenheim University (Institute of Microbiology and Biochemistry [Armin Schüttler; Caroline Guthier]; Institute of General and Organic Viticulture [Manfred Stoll]). AUTHOR: Prof. Dr. Doris Rauhut Institut Mikrobiologie und Biochemie doris.rauhut@hs-gm.de SUSTAINABLE PRODUCTION AND USE OF ORNAMENTAL PLANTS Ornamental plants serve as an integral part of people’s daily life and consumption. Three out of four households buy an ornamental plant at least once a year. The project will employ the broad sustainability potential of the orna- mental plant industry by developing new business models. Currently, environmental conditions at the pro- duction sites are mainly targeted at growth performance and sales quality, while everyday circumstances and environmental conditions in the consumers’ households are out-of-focus. In addition, most of the consumers lack competence in plant care. Product failures are the consequences. As a result, many ornamental plants suffer from stress symptoms. The project follows an inter- disciplinary approach. One sub-project will conduct ethnographic studies in order to explore contexts of use in detail and environmental conditions at consumer level. Another sub-project compiles models for the assessment of sustainability in the value chain of ornamental plant production based on a carbon footprint survey. Finally, new production methods for stress-adapted ornamentals will be tested in cultivation experiments. In co-operation with partners from industry and retail, sustainable product concepts will be formulated. The acceptance of the pronounced recommendations will be examined in a consumer study. AUTHOR: Prof. Dr. Kai Sparke AG Management und Marketing kai.sparke@hs-gm.de 41 Abstracts

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