1. Department of Plant and Microbial Biology, University of Zürich, Zürich, Switzerland
2. Berries and Medicinal Plants, Plant Production Systems, Agroscope, Conthey, Switzerland
3. Institute of Organic Chemistry & Center of Molecular Biosciences, University of Innsbruck, Innsbruck, Austria
4. Institute of Biological, Environmental and Rural Sciences, Aberystwyth, Wales, UK