Affiliation: | Department of Plant Ecology, Lund University, Ecology Building, S-223 62 Lund, Sweden;Department of Ecology and Environmental Research, Swedish University of Agricultural Sciences, P.O. Box 7072, S-750 07 Uppsala, Sweden;Department of Horticulture, Swedish University of Agricultural Sciences, P.O. Box 55, S-230 53 Alnarp, Sweden;Department of Plant Physiology, Lund University, P.O. Box 117, S-221 00 Lund, Sweden |